NCERT Solutions for Class 9th: Ch 6 Peasants and Farmers History

The NCERT Solutions For Class 9th History (Social Science) are given below. Students Should also check NCERT Solutions Class 9 for other subjects to.

NCERT Book Solutions For Class 9 History Chapter 6

Page No: 116

Questions

1. Explain briefly what the open field system meant to rural people in eighteenth-century England.
Look at the system from the point of view of :
(i) A rich farmer
(ii) A labourer
(iii) A peasant woman

Answer

(i) As the prices of wool increased, rich farmers wanted to expand wool production to earn profits. They were eager to improve their sheep breeds and ensure good feed for them. They were keen on controlling large areas of land in compact blocks to allow improved breeding. So they began dividing and enclosing common land and building hedges around their holdings. They drove out villagers who had small cottages on the commons, and they prevented the poor from entering the enclosed fields.

(ii) For the poor labourers, the common lands were essential for survival. They used to live with landowners, doing a number of odd jobs for them in return for board and lodging and a small pay. However, when the open field system began to disappear, labourers were paid wages and employed only at harvest time. This left them at the mercy of rich landowners and farmers.

(iii) For peasant women, the open field system was a good way of community living wherein everything was shared between the rich and the poor. They would use the common lands for grazing their cattle, gathering fruits and collecting firewood. However, all these activities were negatively affected because of the disappearance of open fields.

2. Explain briefly the factors which led to the enclosures in England.

Answer

The factors which led to the enclosures in England were:

→ Increasing population and due to it increasing demand for food grains and other things led to the enclosure in England.

→ The rising prices of agricultural products such as wool, wheat, milk, fruits etc. also played a role as a factor in promoting enclosures in England.

→ Industrialisation and war needs made foodgrain prices soar, making it necessary to take steps to increase its production.

→ In the nineteenth-century, enclosure were seen necessary to make long-term investment on land and plan crop rotations to improve the soil.

→ Enclosures also allowed the richer landowners to expand the land under their control and produce for the market.

3. Why were threshing machines opposed by the poor in England?

Answer

Threshing machines were opposed by the poor in England because they thought that these machines would deprive workmen of their livelihood. They believed that with the help of machines the richer farmers and big landlords would encourage enclosure movement. The commons would be distributed among rich farmers, and poor farmers, labourers, peasants women would have to- struggle for their jobs and they would be jobless.

4. Who was Captain Swing? What did the name symbolise or represent?

Answer

Captain Swing was a mythic name used in threatening letters, written by the workmen against the use of threshing machines by rich farmers.
The name symbolised anger or unhappiness of the labourers against the use of threshing machines by rich farmers or big landowners.

5. What was the impact of the westward expansion of settlers in the USA?

Answer
The westward expansion of settlers in the USA led to a complete annihilation of American Indians who were pushed westwards, down the Mississippi river, and then further west beyond that. They fought back, but were defeated; their villages were burnt and cattle destroyed. Also, with the cultivation of land for agricultural purposes, all grass and trees were razed. This led to terrible dust storms and blizzards in the 1930s, causing much death and destruction.

6. What were the advantages and disadvantages of the use of mechanical harvesting machines in the USA?

Answer

The advantages of the use of mechanical harvesting machines in the USA were:
→ The price of wheat was high and demand limitless. These new machines allowed farmers to quickly clear tracts, break up the soil, remove the grass and prepare the ground for cultivation.
→ The work could be done within a shorter time period and with a lesser number of labourers.
→ With power-driven machinery, four men could plough, seed and harvest 2,000 to 4,000 acres of wheat in a season.

However there were some disadvantages for the poorer farmers too:
→ They were thrown out of their jobs and they lost their means of livelihood.
→ Many of them bought this machine too but it adversly affect them as the machines were expensive and once the demand crossed its limit there was enough surplus grain in the market. Thus, farmers
needed to pay back the loan they had taken from banks to buy these machines, and the farmers
had no money.

7. What lessons can we draw from the conversion of the countryside in the USA from a bread basket to a dust bowl?

Answer

The expansion of wheat agriculture in the Great Plains created the Dust Bowl. The American dream of a land of plenty had turned into a nightmare.
We need to learn a lesson from this. Use of land is good but overuse of land is bad. We need to realise that land is a precious natural resource which needs to be preserved and conserved. It serves as warning sign against the exploitative use of land for commercial purposes only leads to degradation and depletion. This gives rise to serious consequences. We must realise that we need to respect the ecological conditions of each region and work towards sustainable development and look after our earth.

8. Write a paragraph on why the British insisted on farmers growing opium in India.
Answer

The British insisted on farmers growing opium in India to balance their trade with China. Tea became extremely popular in England, and by 1830, over 30 million pounds of tea was being imported from China. The British could buy tea from China only by paying in bullion. Hence, there was nothing that England could offer to the Chinese in exchange for tea, except money. Opium was used in Chinese medicine, but was banned for use due to its addictive qualities. The British started an illegal opium trade, and by 1839, there were an estimated 12 million opium smokers in China. All the supplied opium came from India and it formed an easy, cheap way to pay for the tea imported from China.

9. Why were Indian farmers reluctant to grow opium?

Answer

The Indian farmers were reluctant to grow opium due to:
→The crop had to be grown on the best land, on fields that lay near the villages and were well manured.
→ This land was usually used for growing pulses. If opium was grown on fertile and well manured land then pulses would have to be grown on less fertile land and yield would not be good in quality as well as quantity.
→ The cultivation of opium was difficult and time-consuming as the plants required looking after. As a consequence, the cultivators would not have time to look after their other produce.
→ The farmers had to pay the rent for their land to the landlords. This rent was very high. The cultivators owned no land.
→ Finally, the price the government paid for the opium produce was very low and would provide the farmers with no profits.

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NCERT Solutions for Class 9th: Ch 5 Pastoralists in the Modern World History

The NCERT Solutions For Class 9th History (Social Science) are given below. Students Should also check NCERT Solutions Class 9 for other subjects to.

NCERT Book Solutions For Class 9 History Chapter 5

Page No: 137

Questions

1. Explain why nomadic tribes need to move from one place to another. What are the advantages to the environment of this continuous movement?

Answer

There were many need of nomadic tribes to move from one place to another:

→ The nomadic tribes had no regular fields of their own from where they could get fodder for their cattle.

→ They lived with their herd in the low hills of Himalayas from September to April because; the huge mountains or high altitude were covered with snow during this period. In these areas, the dry scrub forests provided pastures for their herds during this period.

→ With the onset of summer, as the snow melted and the hills side began to be covered with lush green with a variety of new grasses, the pastoralists started their northward march for their summer grazing grounds.

→ Again with the onset of winter when the mountains began to be covered with snow and there were dearth of nutritious forage, these pastoralists on the move again, this time on their downward journey.

The movement of the nomadic pastoralists from the downward to the upward areas and vice-versa allowed sufficient time for natural restoration of vegetation grounds. Their continuous shifting provided sufficient forage to the different animals both at the high mountains and the lower hills. They also helped in maintaining the quality of the pastures.

2. Discuss why the colonial government in India brought in the following laws. In each case, explain how the law changed the lives of pastoralists:

Answer

(i) Waste Land rules: All grazing lands were considered ‘waste land’ by the colonial rulers as they brought no revenue to them. If this land could be transformed into cultivated farmland, it would result in an increase in land revenue and production of crops such as jute, cotton and wheat. This is why the Waste Land rules were formulated. However, they sounded the death knell for pastoralists because an increase in cultivated land meant an obvious decline in pastures and a consequent loss of a means of livelihood for them.

(ii) Forests Acts:These were enacted to protect and preserve forests for timber which was of
commercial importance. These acts changed the life of pastoralists. They were now prevented from entering many forests that had earlier provided valuable forage for their cattle. They issued permits which monitored their entry and exit into forests. They could not stay in the forests as much as they liked because the permit specified the number of days and hours they could spend in the forests.
(iii) Criminal Tribes Act: The British government eyed nomadic people with suspicion and disregard on account of their continuous movement. They could not be tracked down or placed in one particular place, unlike rural people in villages who were easy to identify and control. Hence, the colonial power viewed nomadic tribes as criminal. The Criminal Tribes Act was passed in 1871 and it further ruined the lives of the pastoralists who were now forced to live in notified settlements and were disallowed from moving out without a government permit.

(iv) Grazing Tax: It was imposed by the colonial government to expand its revenue income. Pastoralists had to pay a tax on every animal they grazed on the pastures. This right was now auctioned out to contractors. They extracted as high a tax as they could, to recover the money they had paid to the state and earn as much profit as they could. Later the government itself started collecting taxes. This created problems for the pastoralists who were harassed by tax collectors. It also became an economic burden on them.

3. Give reasons to explain why the Maasai community lost their grazing lands.

Answer

The Maasais lost their grazing lands due to the following reasons:

→ In 1885, Maasai land was cut in half by an international boundary between British Kenya and German Tanganyika.

→ The best pastures were reserved for white settlements, and the Maasai tribes were given arid zone with uncertain rainfall and poor pastures into a small area in south Kenya and north Tanzania.

→ The British colonial government in east Africa also encouraged local peasant communities to expand cultivation. As cultivation expanded, pasturelands were turned into cultivated fields.

→ Large areas of grazing land were also turned into game reserves where pastoralists were not allowed to enter.

→ This lack of good grazing lands and a two-year drought led to losses of almost 60% cattle belonging to the Maasai tribes.

Thus, with the expansion of British colonisation, the Maasai community lost their grazing lands.

4. There are many similarities in the way in which the modern world forced changes in the lives of pastoral communities in India and East Africa. Write about any two examples of changes which were similar for Indian pastoralists and the Maasai herders.
Answer

There are many similarities in the way in which the modern world forced changes in the lives of pastoral communities in India and East Africa. Here are two examples of changes which were similar for Indian pastoralists and the Maasai herders:

→ All uncultivated land was seen as ‘waste land’ by colonial powers. It produced neither revenue nor agricultural produce. This land was brought under cultivation. In most areas, the lands taken over were actually grazing tracts used regularly by pastoralists, so the expansion of cultivation inevitably meant the decline of pastures and a problem both for Indian pastoralists and the Maasai.

→ From the 19th century onwards, the colonial government started imposing restrictions on the pastoral communities. They issued permits which allowed them to move out with their stock and it was difficult to get permits without trouble and harassment. Those found guilty of disobeying the rules were severely punished.

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NCERT Solutions for Class 9th: Ch 4 Forest Society and Colonialism History

The NCERT Solutions For Class 9th History (Social Science) are given below. Students Should also check NCERT Solutions Class 9 for other subjects to.

NCERT Book Solutions For Class 9 History Chapter 4

Page No: 96

Questions

1. Discuss how the changes in forest management in the colonial period affected the following groups of people :
(i) Shifting cultivators
(ii) Nomadic and pastoralist communities
(iii) Firms trading in timber/forest produce
(iv) Plantation owners
(v) Kings/British officials engaged in hunting.

Answer

(i) Shifting cultivators practice slash and burn agriculture. In this practice, parts of the forest are cut and burnt in a rotation. European foresters regarded this practice as harmful for the forests. They felt that such land could not be used for growing trees for railway timber and was dangerous while being burnt as it could start a forest fire. This type of cultivation also made difficult for the government to calculate taxes. Thus, Colonial government banned shifting cultivation. As a result, many communities were forcibly displaced from their homes in the forests. Some had to change occupations, while some resisted through large and small rebellions.
(ii) The reservation of forest areas by the British Government also sealed the fate of many nomadic and pastoral communities like the Korava, Karacha and Yerukula of the Madras Presidency lost their means of livelihood. Earlier these people and their cattle depended totally on the forest from which they were deprived because of the new forest management. Some of these communities began to be called ‘criminal tribes’ and were forced to work in factories, mines, and plantations under government supervision. Thus, these people were forced to operate within new systems and reorganize their lives.
(iii) Firms trading in timber products were given the sole trading rights to trade in the forest products of particular areas. They made huge profits and became richer. The entire timber and forest trade passed on to them. They became powerful and began to cut down trees indiscriminately.
(iv) Plantation owners found that more and more forest land could be cleared for plantations. The British had made it very clear that their system of forestry would be scientific forestry, i.e., plantations. Plantation owners began to reap profits as the British government gave large areas of forest land to European planters.

(v) While the forest dwellers were deprived of their right to hunt deer, partridges and a variety of small animals, the Indian Kings and British officials were allowed to hunt freely in the reserved forests. Under the colonial rule, the hunting increased to such an extent that various species became extinct. A large number of tigers, leopards, wolves were killed as a sporting trophy. Hunting or shikar became a sport. Later the environmentalists and conservators realized many species of animals needed to be protected and not killed.

2. What are the similarities between colonial management of the forests in Bastar and in Java?

Answer

The similarities between colonial management of the forests in Bastar and Java were :
→ Forest laws were enacted in Java and Bastar.
→ These laws restricted villagers’ access to forests.
→ Timber could be cut from only specified forests and under close supervision.
→ Villagers were punished for entering forests and collecting forest products without a permit.
→ Permits were issued to the villagers for entry into forests and collection of forest products.
→ Both had a forest service.
→ Both followed a system of forestry which was known as scientific forestry.
→ In both places, Forest Acts meant severe hardship for villagers. Their everyday practices — cutting wood for their houses, grazing their cattle, collecting fruits and roots, hunting and fishing became illegal.
→ Constables and forests guards began to harass people.
3. Between 1880 and 1920, forest cover in the Indian subcontinent declined by 9.7 million hectares, from 108.6 million hectares to 98.9 million hectares. Discuss the role of the following factors in this decline :
(i) Railways
(ii) Shipbuilding
(iii) Agricultural expansion
(iv) Commercial farming
(v) Tea/Coffee plantations
(vi) Adivasis and other peasant users.

Answer

(i) Railways played a vital role in the decline of the forest cover in India. For laying railway tracks forest land had to be cleared. Apart from clearing area for tracks, railway locomotives required timber for fuel and sleepers. For all these needs forests had to be cut down. The British government gave contracts to individuals to supply the required quantity of timber. These individuals cut down trees indiscriminately.

(ii) By the end of 19th century, oak forests in England had almost disappeared. This created a shortage of timber for the Royal Navy. If the imperial power was to be protected and maintained, the building of ships was the first priority. So, search parties were sent to explore the forest resources of India. A large number of sleepers began to be exported to England annually. This further led to the indiscriminate cutting of trees year after year which caused deforestation on a massive scale.

(iii) The population was on the rise and the demand for food increased. Peasants extended the boundaries of cultivation by clearing forests. This gave them more land available for cultivation. In addition, there was great demand for cash crops such as tea, cotton, jute, sugar, etc., which were needed to feed the industries of England.

(iv) The British directly encouraged the production of commercial crops like jute, sugar, wheat and cotton. The demand for these crops increased in the 19th century in Europe, where foodgrains were needed to feed the growing urban population and raw materials were required for industrial production. Hence, large tracts of forest land were cleared to make land available for commercial farming.

(v) The colonial state thought that forest land was unproductive. It did not yield agricultural produce nor revenue. Large areas of natural forests were hence cleared to make way for tea, coffee and rubber plantations to meet Europe’s growing need for these commodities. The colonial government took over the forests and gave vast areas to European planters at cheap rates. The areas were enclosed and cleared of forests and planted with tea or coffee.

(vi) The Adivasis and other peasant users, gather forest products and graze their cattle.  Their livelihood mainly came from forest produce. This does not destroy the forests except sometimes in shifting agriculture. In fact, now the new trends that promote forest conservation tend to involve local villagers in conservation and preservation. Adivasis and other peasant communities regard the forests as their own and even engage watchmen to keep a vigil over their forests.

4. Why are forests affected by wars?

Answer

Forests are affected by wars and this often leads to deforestation. Forests during wars are freely cut to meet the needs of war. Forests are an important resource and hence during wars they are destroyed by their own country under the ‘a scorched earth policy’. This prevents the enemy from using this resource. Many villagers used this opportunity to expand cultivation in the forest.

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Duplicated: NCERT Solutions for Class 9th: Ch 3 Nazism and the Rise of Hitler History

The NCERT Solutions For Class 9th History (Social Science) are given below. Students Should also check NCERT Solutions Class 9 for other subjects to.

NCERT Book Solutions For Class 9 History Chapter 3

Page No: 74

Questions

1. Describe the problems faced by the Weimar Republic.

Answer

The problems faced by the Weimar Republic were:

→ Versailles treaty: The Versailles Peace Treaty at the end of the First World War dispossessed Germany of its territories, its resources and its pride as a nation. He also had to pay 6 billion pounds as war compensation. In spite of the harsh terms, the Weimar Republic accepted the humiliating treaty, thereby making it unpopular amongst the German masses.

→ Economic Crisis: The German state was financially crippled due to overwhelming war debts which had to be paid in gold. Subsequently, gold reserves depleted and value of German mark fell. Prices of essential goods rose dramatically.

→ Political defects: The Weimar Republic was weak due to inherent constitutional irregularities such as proportional representation and Article 48 (which gave the President the power to impose emergency and rule by decree). The democratic parliamentary system seemed to give the people no solutions or benefits in the times of the severe economic crisis.

2. Discuss why Nazism became popular in Germany by 1930.

Answer

Nazism became popular in Germany by 1930 due to lot of reasons:

→ The most apparent being the Great Depression. The Weimar Republic did little to remedy the country’s economic downfall, and Hitler was presented as a saviour to the humiliated German people living in economic and political crises.

→ The powerful speeches of Hitler in which he sought to build great nation, undo the injustice of the Versailles Treaty, restore the dignity of German people and provide employment for all stirred hopes in people.

→ Nazi propaganda was unique. Red banners with the Swastika, Nazi salute and the rounds of applause attracted the people making Nazism very popular.

3. What are the peculiar features of Nazi thinking?

Answer

The peculiar features of Nazi thinking were
→ A belief in racial heirarchy and Lebensraum or living space.
→ Nordic German Aryans were at the top, while the jews formed the lowest rung of the racial ladder.
→ They believed that only the strongest race would survive and rule.
→ New territories must be gained for enhancing the natural resources and power of Germany.

4. Explain why Nazi propaganda was effective in creating a hatred for jews.

Answer

Nazi propaganda was effective in creating hatred for the jews:
→ The Nazis used the language and media effectively with great care. The racial theory put forward by the Nazis that the Jews belonged to a lower race and as such were undesirable.

→ The traditional Christian hatred for the Jews, because they were accused to have killed Christ, was fully exploited by the Nazis in order to make the Germans pre-judicial against Jews.

→ The Nazis injected hatred against the Jews even in the minds of the children from the very beginning during the days of their schooling. The teachers who were Jews were dismissed and Jews children were thrown out of the schools. Such methods and new ideological training to the new generation of children went a long way in making the Nazi’s propaganda quite effective in creating hatred for the Jews.

→ Propaganda films were made to create hatred for the Jews. Orthodox Jews were stereotyped and marked. For example, one such film was‘The Eternal Jew’.

5. Explain what role women had in Nazi society. Return to Chapter 1 on the French Revolution. Write a paragraph comparing and contrasting the role of women in the two periods.

Answer

Role of women in Nazi society followed the rules of a largely patriarchal or male-dominated society. Hitler hailed women as “the most important citizen” in his Germany, but this was true for only Aryan women who bred pure-blood, “desirable” Aryans. Motherhood was the only goal they were taught to reach for, apart from performing the stereotypical functions of managing the household and being good wives. This was in stark contrast to the role of women in the French Revolution where women led movements and fought for rights to education and equal wages. They were allowed to form political clubs, and schooling was made compulsory for them after the French Revolution.

6. In what ways did the Nazi state seek to establish total control over its people?

Answer

The Nazis established control over its people by various means:

→ They used different propaganda through posters or films to glorify their behaviour.
→ Media was carefully used to win support for the regime and popularise it.
→ Nazism worked on the minds of the people, tapped their emotions and turned their hatred and anger against those marked as ‘undesirable’.
→ Special surveillance and security forces to control and order society in ways that the Nazis wanted, was created.
→ The police forces had powers to rule with impunity. Genocide also created an atmosphere of fear and repression which helped them to establish total control over its people.

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NCERT Solutions for Class 9th: Ch 2 Socialism in Europe and the Russian Revolution History

The NCERT Solutions For Class 9th History (Social Science) are given below. Students Should also check NCERT Solutions Class 9 for other subjects to.

NCERT Book Solutions For Class 9 History Chapter 2

Page No: 48

Questions

1. What were the social, economic and political conditions in Russia before 1905?

Answer

The Social, economic and political conditions in Russia before 1905 was backward:

→ Social Conditions: 85% of Russia’s population was agriculturist. The industry was existent, but rarely in which most of was privately owned. Workers were divided on the basis of their occupation. They mainly migrated to cities for employment in factories. The peasant community was deeply religious but did not care much about the nobility. They believed that land must be divided amongst themselves.

→ Economic Condition: Russia was going through bad period economically. Prices of essential good rises while real wages decreased by 20% leading to the famous St.Petersburg strike. This strike started a series of events that are together known as the 1905 Revolution. During this revolution, there were strikes all over the country, universities closed down, and various professionals and workers established the Union of Unions, demanding the establishment of a constituent assembly.

→ Political Condition: Political parties were illegal before 1914. The Russian Social Democratic Workers Party was founded in 1898 by socialists who respected Marx’s ideas. In 1903, this party was divided into two groups – Mensheviks and Bolsheviks. The Bolsheviks, who were in majority, were led by Lenin who is regarded as the greatest thinker on socialism after Marx.

2. In what ways was the working population in Russia different from other countries in Europe, before 1917?

Answer

The working population in Russia was different from other countries in Europe before 1917 because not all Russian workers migrated from the villages to work in the industrial sector. Some of them continued to live in villages and went to work daily, to the towns. They were a divided group, socially and professionally, and this showed in their dress and manners too. Metal workers were the “aristocrats” of the working class because their occupation demanded more training and skill. Nevertheless, the working population was united on one front – strikes against work conditions and employer tyranny.

3. Why did the Tsarist autocracy collapse in 1917?

Answer

The Tsar first dismissed the initial two Dumas and then packed the parliament with the conservatives. During the First World War, the Tsar took decisions without consulting the Duma. Large scale casualties of Russian soldiers in the war further alienated the people from the Tsar. Burning of crops and buildings by the retreating Russian armies created a huge shortage of food in Russia. All of these led to the collapse of the Tsarist autocracy in 1917.

4. Make two lists: one with the main events and the effects of the February Revolution and the other with the main events and effects of the October Revolution. Write a paragraph on who was involved in each, who were the leaders and what was the impact of each on Soviet history.

Answer

February Revolution:
→ 22nd February: Factory lockout on the right bank took place,
→ 25th February: Duma was dissolved.
→ 27th February: Police Headquarters ransacked. Regiments support the workers. Formation of Soviet.
→ 2nd March: The Tsar abdicated his power. The Soviet and Duma leaders formed a Provisional Government for Russia.The February Revolution had no political party at its forefront. It was led by the people themselves. Petrograd had brought down the monarchy, and thus, gained a significant place in Soviet history. Trade Unions grew in number.

October Revolution:
→ 16th October: A Military Revolutionary Committee was appointed by Soviet.
→ 24th October: The uprising against provisional government begins. Military Revolutionary Committee controls the city by night and ministers surrender. The Bolshevik gained power.
The October Revolution was primarily led by Lenin and his subordinate, Trotskii and involved the masses who supported these leaders. It marked the beginning of Lenin’s rule over the Soviet, with the Bolsheviks under his guidance.

5. What were the main changes brought about by the Bolsheviks immediately after the October Revolution?

Answer

The main changes which were brought about by the Bolsheviks immediately after the October Revolution:
→ Banks and Industries were nationalised.
→ Land was declared social property, thereby allowing peasants to seize it from the nobility.
→ In urban areas, houses were partitioned according to family requirements
→ Old aristocratic titles were banned, and new uniforms were designed for the army and the officials.
→ New uniforms were introduced for the army and the officials.

6. Write a few lines to show what you know about:
(i) Kulaks
(ii) The Duma
(iii) Women workers between 1900 and 1930.
(iv) The Liberals.
(v) Stalin’s collectivization programme.

Answers

(i) It is the Russian term for wealthy peasants who Stalin believed were hoarding grains to gain more profit. By 1927-28 the towns of Soviet Russia were facing an acute problem of grain supplies. Kulaks were thought to be partly responsible for this. Also to develop modern farms and run them along industrial lines the Party under the leadership of Stalin thought it was necessary to eliminate Kulaks.

(ii) During 1905 Revolution, the Tsar allowed the creation of an elected consultative parliament in Russia. This elected consultative parliament in Russia was called Duma.

(iii) They made up 31% of the factory labour force by 1914 but were paid almost half and three-quarters of the wages given to men. However, interestingly, it was the women workers who led the way to strikes during the February Revolution.

(iv) They espoused a nation that was tolerant towards all religions; one that would protect individual rights against the government. Although the liberals wanted an elected parliamentary form of governance, they believed that the right to vote must only belong to men, and that too the ones who were property holders.

(v) Stalin believed that collectivization of agriculture would help in improving grains supplies in Russia. He began collectivization in 1929. All peasants were forced to cultivate in collective farms (kolhoz). The bulk of land and implements were transferred to the ownership of the collective farm. Many peasants protested such attempts and destroyed livestock to show their anger. Collectivization did not bring the desired results in the food supply situation turned even worse in subsequent years.

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NCERT Solutions for Class 9th: Ch 1 The French Revolution History

The NCERT Solutions For Class 9th History (Social Science) are given below. Students Should also check NCERT Solutions Class 9 for other subjects to.

NCERT Book Solutions For Class 9 History Chapter 1

Page No: 24

Questions

1. Describe the circumstances leading to the outbreak of revolutionary protest in France.

Answer

The circumstances leading to the outbreak of revolutionary protest in France were:

→ Social Inequality: French society in the eighteenth century was divided into three estates namely The Clergy, The nobility and third estates. First two estates, that is, the clergy and the nobility enjoyed certain privileges by birth. They were exempt from paying taxes. The Third estate comprises of businessmen, merchants, Peasants and artisans, labours had to pay taxes to the state.

→ Political Causes: Long years of war had drained the financial resources of France. France had a debt of more than 2 billion livres. To meet its regular expenses, such as the cost of maintaining an army, the court, running government offices or universities, the state was forced to increase taxes which angered the people.

→ Economic Problems: The population of France also increased from 23 million in 1715 to 28 million in 1789. Food grains were now in great demand. The price of bread shot up. Wages did not keep pace with rising prices. This led to subsistence crisis.

→ Strong Middle Class: A new middle class emerged educated and wealthy during the eighteenth century. They believed that no group in society should be given privileges by birth. Ideas of equality and freedom were put forward by philosophers. The ideas of these philosophers were discussed intensively in salons and coffee houses and spread among people.

→ Immediate Causes: On 5 may, 1789, Louis XVI called together an assembly of Estates General to pass proposals for new taxes. Third estates protested against this proposal but as each estate have one vote, the king rejected this appeal. They walked out of the assembly.

2. Which groups of French society benefited from the revolution? Which groups were forced to relinquish power? Which sections of society would have been disappointed with the outcome of the revolution?

Answer

It was the richer members of the third estate who mostly benefited from the French Revolution.
The clergy and the nobility were forced to relinquish (surrender) their power.
The poor class of third estate and women would have been disappointed with the outcome of the revolution as the promise of equality, discussed during the revolution was not given. The poorer classes had no right to vote.

3. Describe the legacy of the French Revolution for the peoples of the world during the nineteenth and twentieth centuries.

Answer
The ideas of liberty and democratic rights were the most important legacy of the French Revolution. These spread from France to the rest of Europe during the nineteenth century, where feudal systems were abolished. It inspired the Germans, Italians, and Austrians to overthrow their oppressive regimes. The French Revolution inspired the struggling nations of Asia and Africa who were groaning under the oppression of European colonialism. Tipu Sultan and Rajaram Mohan Roy are two examples of individuals who responded to ideas coming from French revolution.

4. Draw up a list of democratic rights we enjoy today whose origins could be traced to the French Revolution.

Answer

We can trace the origin of the following democratic rights we enjoy today to the French revolution:
→ Right to Equality before law
→ Freedom of Speech and expression
→ Right against exploitation
→ Right to justice

5. Would you agree with the view that the message of universal rights was beset with contradictions? Explain.

Answer

Yes, the message of universal rights was beset with contradictions:

→ Law is the expression of the general will. All citizens have the right to participate in its formation, personally or through their representatives. – In this line, it is stated that every citizen has the right to participate in the law however only men above 25 years of age who paid taxes equal to at least 3 days of a labourer’s wage were given voting right. The remaining men and all women were classed as passive citizens and were deprived of voting rights.

Hence, the message of universal rights was not very clear. The Constitution is only available for the rich. Women were totally neglected in decision making.

6. How would you explain the rise of Napoleon?

Answer

After Robespierre’s rule came to an end a directory was formed to avoid concentration of power in one individual. Members of the directory often fought among themselves leading to total chaos and political instability. This created a political vacuum in France. This was a conducive situation and Napoleon Bonaparte took the reign of power as a military dictator.

Napoleon saw his role as a moderniser of Europe. He introduced many laws such as the protection of private property and a uniform system of weights and measures provided by the decimal system.

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NCERT SOLUTIONS FOR CLASS 9 | Ch 15 Improvement in Food Resources Science | EDUGROWN

We have solved every question stepwise so you don’t have to face difficulty in understanding the solutions. It will also give you concepts that are important for overall development of students. Class 9 Ch 15 Improvement in Food Resources Written Solutions  & Video Solution will be useful in higher classes as well because variety of questions related to these concepts can be asked so you must study and understand them properly

NCERT Solutions for Class 9 Ch 15 Improvement in Food Resources Science

In text Questions

Page No: 204

1. What do we get from cereals, pulses, fruits and vegetables?

Answer

→ Cereals provide us with carbohydrates. Also, they are a rich source of energy.
→ Pulses give us proteins.
→ Fruits and vegetables are a rich source of vitamins and minerals. A small amount of proteins, carbohydrates, and fats are also present in them.

Page No: 205

1. How do biotic and abiotic factors affect crop production?

Answer

Biotic factors such as pests, insects and diseases reduce the crop production. A pest causes damage to our crops by feeding. Weeds also reduce crop productivity by competing with the main crop for nutrients and light.
Similarly, abiotic factors such as temperature, wind, rain etc. affect the net crop production. For example droughts and floods have a great impact on crops sometimes, destroying the entire crop.
 


2. What are the desirable agronomic characteristics for crop improvements?

Answer

The desirable agronomic characteristics for crop improvements are:
→ Tallness and profuse branching in any fodder crop.
→ Dwarfness in cereals.
 
Page No: 206

1. What are macro-nutrients and why are they called macro-nutrients?

Answer

Macro-nutrients are those nutrients which are required in large quantities for growth and development of plants. Since they are required in large quantities, they are known as macro-nutrient. The six macro-nutrients required by plants are nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.

2. How do plants get nutrients?

Answer

Plants get nutrients from air, water, and soil. Soil is the major source of nutrients. Thirteen of these nutrients are available from soil. The remaining three nutrients (carbon, oxygen, and hydrogen) are obtained from air and water.
 
Page No: 207

1. Compare the use of manure and fertilizers in maintaining soil fertility.
 
Answer

Manures increase soil fertility by enriching the soil with organic matter and nutrients as it is prepared by the decomposition of animal excreta and plant wastes. On the other hand, fertilizers are mostly inorganic compounds whose excessive use is harmful to the symbiotic micro-organisms living in soil. Their excessive use also reduces soil fertility. Hence, fertilizers are considered good for only short term use.
 
Page No: 208
 
1. Which of the following conditions will give the most benefits? Why?
(a) Farmers use high-quality seeds, do not adopt irrigation or use fertilizers.
(b) Farmers use ordinary seeds, adopt irrigation and use fertilizer.
(c) Farmers use quality seeds, adopt irrigation, use fertilizer and use crop protection measures.
 
Answer
 
(c)Farmers using good quality seeds, adopting irrigation, using fertilizers, and using crop protection measures will derive most benefits.
→ The use of good quality seeds increases the total crop production. If a farmer is using good quality seeds, then a majority of the seeds will germinate properly, and will grow into a healthy plant.
 

→ Proper irrigation methods improve the water availability to crops.
→ Fertilizers ensure healthy growth and development in plants by providing the essential nutrients such as nitrogen, phosphorus, potassium, etc.
→ Crop protection measures include various methods to control weeds, pests, and infectious agents. If all these necessary measures are taken by a farmer, then the overall production of crops will increase.

Page No: 209

1. Why should preventive measures and biological control methods be preferred for protecting crops?

Answer

Preventive measures and biological control methods should be preferred for protecting crops because excessive use of chemicals leads to environmental problems. Biological methods cause harm neither to crop nor to the environment.

2. What factors may be responsible for losses of grains during storage?

Answer

Factors causing loss of grains during storage:
→ Biotic Factors: Insects, rodents, fungi and bacteria etc.
→ Abiotic Factors: Moisture Content and Temprature etc.

Page No: 210

1. Which method is commonly used for improving cattle breeds and why?

Answer

Cross Breeding is commonly used for improving cattle breeds.Cross breeding between two good varieties of cattle will produce a new improved variety. For example, the cross between foreign breeds such as Jersey Brown, Swiss and Indian breeds such as Red Sindhi, Sahiwal produces a new variety having qualities of both breeds.

Page No: 211

1. Discuss the implications of the following statement:
“It is interesting to note that poultry is India’s most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious animal protein food.”

Answer

Poultry in India is the most efficient converter of low fibre food stuff into highly nutritious animal protein food. In poultry farming, domestic fowls are raised to produce eggs and chicken. For this, the fowls are given animal feeds in the form of roughage, which mainly consists of fibres. Thus, by feeding animals a fibre rich diet, the poultry gives highly nutritious food in the form of eggs and chicken.

1. What management practices are common in dairy and poultry farming?

Answer

Common management practices in dairy and poultry farming are:
→ Proper shelter facilities and their regular cleaning.
→ Some basic hygienic conditions such as clean water, nutritious food, etc.
→ Animals are kept in spacious, airy, and ventilated place.
→ Prevention and cure of diseases at the right time is ensured.

2. What are the differences between broilers and layers and in their management?

Answer
Layers are meant for egg production, whereas broilers are meant for poultry meat. Nutritional, environmental, and housing conditions required by broilers are different from those required by egg layers. A broiler chicken, for their proper growth, requires vitamin rich supplements especially vitamin A and K. Also, their diet includes protein rich food and enough fat. They also require extra care and maintenance to increase their survival rate in comparison to egg layers.

Page No: 213

1. How are fish obtained?

Answer

Fish can be obtained by two ways:
→ Capture fishing: It is the process of obtaining fish from natural resources.
→ Culture fishery: It is the practice of farming fishes. Farming can be done in both freshwater ecosystem (which includes river water, pond water) and marine ecosystem.

2. What are the desirable characters of bee varieties suitable for honey production?

Answer

Bee varieties having the following desirable characters are suitable for honey production:
→They should yield high quantity of honey.
→ They should not sting much.
→ They should stay in the beehive for long durations.
→ They should breed very well.

1. What are the advantages of composite fish culture?

Answer

The advantages of composite fish culture are: → Fish can be grown in crop fields especially paddy.
→ Intensive Fish farming is possible because plenty of water is available during crop seasons.
→ In this system both local and imported fish species can be cultivated.

2. What is pasturage and how is it related to honey production?

Answer

Pasturage is the availability of flowers from which bees collect nectar and pollen. It is related to the production of honey as it determines the taste and quantity of honey.

Excercise

1. Explain any one method of crop production which ensures high yield.

Answer

Inter cropping is a method of crop production which ensures high yield. It is a practice of growing two or more crops simultaneously. in the same field in rows. In inter cropping definite row patterns are followed such as one row of main crop of is followed by two row of intercrop.
In inter cropping there is greater utilisation of the interspaced area, light, nutrients, water and air. As a result productivity per unit area increased.

2. Why are manures and fertilizers used in fields?

Answer

Manures and fertilizers are used in fields to enrich the soil with the required nutrients. Manure helps in enriching the soil with organic matter and nutrients. This improves the fertility and structure of the soil. On the other hand, fertilizers ensure a healthy growth and development in plants. They are a good source of nitrogen, phosphorus, and potassium. To get an optimum yield, it is instructed to use a balanced combination of manures and fertilizers in the soil.

3. What are the advantages of inter-cropping and crop rotation?

Answer

Inter-cropping and crop rotation both are used to get maximum benefit on limited land. Inter-cropping helps in preventing pests and diseases to spread throughout the field. It also increases soil fertility, whereas crop rotation prevents soil depletion, increases soil fertility, and reduces soil erosion. Both these methods reduce the need for fertilizers. It also helps in controlling weeds and controls the growth of pathogens and pests in crops.

4. What is genetic manipulation? How is it useful in agricultural practices?

Answer

Genetic manipulationis a process where the gene for a particular character is introduced inside the chromosome of a cell. When the gene for a particular character is introduced in a plant cell, a transgenic plant is produced. These transgenic plants exhibit characters governed by the newly introduced gene.
Genetic manipulation is useful in developing varities with Higher yield, Good Quality, Biotic and Abiotic resistance, short maturity period, wider adaptability and desirable agronomic characteristics

5. How do storage grain losses occur?

Answer

There are various biotic and abiotic factors that act on stored grains and result in degradation, poor germinability, discolouration, etc.

Biotic factors include insects or pests that cause direct damage by feeding on seeds. They also deteriorate and contaminate the grain, making it unfit for further consumption.
Abiotic factors such as temperature, light, moisture, etc., also affect the seed. They decrease the germinating ability of the seeds and make them unfit for future use by farmers. Unpredictable occurrence of natural calamities such as droughts and floods also causes destruction of crops.
 

6. How do good animal husbandry practices benefit farmers?

Answer

Cattle farming is one of the methods of animal husbandry that is most beneficial for farmers. Using this method, better breeds of draught animals can be produced. Such draught animals are engaged in agricultural fields for labour work such as carting, irrigation, tilling, etc.

7. What are the benefits of cattle farming?

Answer

Benefits of cattle farming:
→ Good quality and quantity of milk can be produced.
→ Draught labour animals can be produced for agricultural work.
→ New variety that are resistant to diseases can be produced by crossing two varieties with the desired traits.

8. For increasing production, what is common in poultry, fisheries and bee-keeping?

Answer

The common factor for increasing production in poultry, fisheries, and bee keeping is the proper management techniques that are to be followed. Regular cleaning of farms is of utmost importance. Maintenance of temperature and prevention and cure of diseases is also required to increase the number of animals.

9. How do you differentiate between capture fishing, mariculture and aquaculture?

Answer

→ Capture fishing the method of obtaining fishes from natural resources

→ Mariculture is the culture of marine fishes for commercial use.

→ Aquaculture involves the production of aquatic animals that are of high economic value such as prawns, lobsters, fishes, crabs, etc.

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NCERT SOLUTIONS FOR CLASS 9 | Ch 14 Natural Resources Science | EDUGROWN

We have solved every question stepwise so you don’t have to face difficulty in understanding the solutions. It will also give you concepts that are important for overall development of students. Class 9 Ch 14 Natural Resources Written Solutions  & Video Solution will be useful in higher classes as well because variety of questions related to these concepts can be asked so you must study and understand them properly

NCERT Solutions for Class 9 Ch 14 Natural Resources Science

In text Questions

Page No: 193

1. How is our atmosphere different from the atmospheres on Venus and Mars?

Answer

Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%.

2. How does the atmosphere act as a blanket?

Answer

The atmosphere acts as a blanket by performing the following functions:
→ It keeps the average temperature of the Earth fairly constant during day time and even during the course of whole year.
→ It prevents a sudden increase in the temperature during day time.
→ It slows down the escape of heat from the surface of the Earth into outer space during night time.

3. What causes winds?

Answer

An uneven heating of the Earth’s surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Then, air from a high pressure region moves to a low pressure region, causing wind.

4. How are clouds formed?

Answer

During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up. When this heated air rises, it expands and cools, which results in the condensation of water vapour forming water droplets. The presence of dust and other suspended particles in air also facilitates the process of condensation. The formation of water droplets leads to the formation of clouds.

5. List any three human activities that you think would lead to air pollution.

Answer

Three human activities leading to air pollution are:
→ Smoke from industries e.t.c.
→ Burning of fossil fuels like coal and petroleum→ Deforestation.

Page No: 194

1. Why do organisms need water?

Answer

The organisms need water:
→ For different cellular process.
→ For transportation of substance from one place to another inside the body.

2. What is the major source of fresh water in the city/town/village where you live?

Answer

Rivers.

3. Do you know of any activity which may be polluting this water source?

Answer

The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes this fresh water source.

Page No: 196

1. How is soil formed?

Answer

Soil is formed by breaking down of rocks at or near the surface of the Earth through various physical, chemical, and biological processes by various factors such as the sun, water, wind, and living organisms.→ Sun: During day time, the rocks are heated up by solar rays. This causes the rocks to expand. During night time, these rocks cool down and contracts, thus the cracks devlop in the rock and they break down.
→ Water: It helps in breaking of rocks in two ways:
(i) It goes into the cracks and crevices formed in the rocks. When this water freezes, its volume increases. As a result, the size of the cracks also increases. This helps in the weathering of rocks.
(ii) Water moving in fast speed carries big and small particles of rock downstream. These rocks rub against each other, resulting in breaking down of rocks.These smaller particles are carried away by running water and deposited down its path.→ Wind: Strong winds carry away rocks, which causes rubbing of rocks. This results in the breaking down of rocks into smaller and smaller particles.
→ Living Organism: Some living organisms like lichens help in the formation of soil. Lichens grow on rock surfaces and converts them into powdery form and make soil layer. In the same way, the plants like moss also help in the making of fine soil particles.

2. What is soil erosion?

Answer

The blowing away or washing away of land surface bywind or water is known as soil erosion.

3. What are the methods of preventing or reducing soil erosion?

Answer

The methods of preventing or reducing soil erosion are:
→ Plantation of tress and plants→ Prevention of deforestation
→ Prevent excessive grazing

Page No: 201

1. What are the different states in which water is found during the water cycle?

Answer

Water is found in three different states during the water cycle:
→ Solid (Snow, Ice)
→ Liquid Water (ground water, river water, etc.)
→ Gaseous State (Water vapours)

2. Name two biologically important compounds that contain both oxygen and nitrogen.

Answer

Two biologically important compounds that contain both oxygen and nitrogen are:
(i) Amino acids
(ii) Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)
3. List any three human activities which would lead to an increase in the carbon dioxide content of air.

Answer

Three Human activities are:
→ Burning of fuels in various processes like heating, cooking, transportation, and industry.
→ Human induced forest fires
→ The process of deforestation includes the cutting down of trees. This decreases the uptake of carbon dioxide for photosynthesis. Eventually, the content of carbon dioxide increases.

4. What is the greenhouse effect?

Answer

Some gases like carbon dioxide, methane, nitrous oxide prevent the escape of heat from the Earth’s surface by trapping it. This increases the average temperature of the Earth. This is called the green house effect.

5. What are the two forms of oxygen found in the atmosphere?

Answer

The two forms of oxygen found in the atmosphere are:
→ Diatomic molecular form with chemical formula O2.
→ Triatomic molecular form with chemical formula O3known as ozone.

Excercise

1. Why is the atmosphere essential for life?

Answer

The atmosphere is essential for life because it maintains an appropriate climate for the sustenance of life by carrying out the following activities:
→ Atmosphere keeps the average temperatureof the Earth fairly constant during day time.
→ It prevents a sudden increase in temperature during day time.
→ It also slows down the escape of heat from the surface of the Earth into outer space during night time.

2. Why is water essential for life?

Answer

Water is essential for life because of the following reasons:
→ Most biological reactions occur when substances are dissolved in water. Thus, all cellular processes need water as a medium to take place.
→ Transportation of biological substances needs water as a medium.

3. How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?

Answer

Almost all living organisms are dependent on soil. Some depend directly, while some depend indirectly.
Plants need soil for getting support as well as nutrients to prepare their food.
On the other hand, organisms depend on plants for food and other substances that are essential for life. Herbivores depend directly upon plants, and carnivores depend upon animals, which in turn depend upon plants for food. This makes them depend on soil indirectly.
Organisms that live in water are not totally independent of soil as a resource. These organisms depend on aquatic plants for food and other substances. These aquatic plants in turn require minerals for their sustenance. These minerals are carried to water bodies from soil by rivers, rain water, etc. Without the supply of minerals from the soil to the water bodies, it is impossible to imagine aquatic life.

4. You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?

Answer

The meteorological department of the government collects data on the elements of weather such as maximum and minimum temperatures, maximum and minimum humidity, rainfall, wind speed, etc. They are able to study these elements using various instruments. The maximum and minimum temperature of a day is measured by a thermometer known as the maximum-minimum thermometer. Rain fall is measured by an instrument known as the rain gauge. Wind speed is measured by anemometers. There are various instruments used to measure humidity.


Page No: 202

5. Write a note on how forests influence the quality of our air, soil and water resources.

Answer

Forests influence the quality of our air, soil, and water resources in various ways. Some of them are:
→ Forests balance the percentages of carbon dioxide and oxygen in the atmosphere. The increasing amount of carbon dioxide caused by human activities is balanced by a larger intake of carbon dioxide by plants during the process of photosynthesis. Simultaneously, a large amount of oxygen is released.
→ Forests prevent soil erosion. Roots of plants bind the soil tightly in a way that the surface of the soil cannot be eroded away by wind, water, etc.
→ Forests help in the replenishment of water resources. During the process of transpiration, a huge amount of water vapour goes into the air and condenses to form clouds. These clouds cause rainfall that recharge water bodies.

6. We know that many human activities lead to increasing levels of pollution of the air, water-bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?

Answer

Yes. Isolating human activities to specific areas would help in reducing levels of pollution. For example, setting up of industries in isolated regions will control pollution to some extent. The pollution caused by these industries will not contaminate water resources, agriculture land, fertile land, etc.

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NCERT SOLUTIONS FOR CLASS 9 | Ch 13 Why Do We Fall ill Science | EDUGROWN

We have solved every question stepwise so you don’t have to face difficulty in understanding the solutions. It will also give you concepts that are important for overall development of students. Class 9 Ch 13 Why Do We Fall Ill Written Solutions  & Video Solution will be useful in higher classes as well because variety of questions related to these concepts can be asked so you must study and understand them properly

NCERT Solutions for Class 9 Ch 13 Why Do We Fall ill Science

In-text Questions

Page No: 178

1. State any two conditions essential for good health.

Answer

Two conditions that are essential for good health are:
→ Proper nutrition and a blanced diet
→ Good Social environment.
 
2. State any two conditions essential for being free of disease.

Answer

Two conditions essential for being disease-free are:
→ Person should take balance diet.
→ Personal and community hygiene.

3. Are the answers to the above questions necessarily the same or different? Why?
 
Answer

To some extent they are the same, because if the conditions that are essential for good health are maintained, then automatically the chances of getting a disease will be minimized. But at the same time, we can say that they are different because being health or good health means physical, mental and social well-being while being disease-free means not suffering from a particular disease.

Page No: 180

1. List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?

Answer

Common symptoms which indicate sickness are:
→ Headache
→ Cough
→ Dysentery

If only one of these symptoms is present, we usually do not visit a doctor. This is because such symptoms do not have much effect on our general health and ability to work. However, if a person is experiencing these symptoms for quite sometime, then he needs to visit a doctor for proper treatment.

2. In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?
• If you get jaundice,
• if you get lice,
• If you get acne.

Answer

Jaundice is a disease that can cause long-term effects on our health. It is a chronic disease that lasts for a long period of time. Jaundice does not spread rapidly, but it develops slowly over a period of time.
 
Page No: 187
 
1. Why we are normally advised to take bland and nourishing food when we are sick?

Answer

When we are sick the normal body functions get disturbed. In such situation food that is easily digestible and contains adequate nutrients are required for the speedy recovery. Thus bland and nourishing food is given during sickness.
 
2. What are the different means by which infectious diseases are spread?

Answer

The different modes of transmission of infectious diseases are:
→ Through Air: Certain disease-causing micro-organisms are expelled in air by coughing, sneezing, talking, etc. These micro-organisms can travel through dust particles or water droplets in air to reach other people. For example, tuberculosis, pneumonia, etc. spread through air.
→ Through Water: Sometimes causal micro-organisms get mixed with drinking water and spread water borne diseases. Cholera for example is water borne disease.
→ Through Sexual Contact: Sexual act between two people can lead to the transfer of diseases such as syphilis, gonorrhoea, AIDS, etc.
→ Through Vectors: Certain diseases spread by animals called vectors. For example mosquitoes spread malaria.

3. What precautions can you take in your school to reduce the incidence of infectious diseases?

Answer

Precautions to reduce incidence of infectious diseases are:
→ Staying away from the infected person.
→ Covering mouth or nose while coughing or sneezing to prevent the spread of disease.
→ Drinking safe water.
→ Keeping the school environment clean to prevent multiplication vectors.

4. What is immunization?

Answer

Immunizationis defined as protection of the body from communicable diseases by administration of some agent that mimics the microbe.

5. What are the immunization programmes available at the nearest health centre in your locality? Which of these diseases are the major health problems in your area?

Answer

The immunization programmes available at the nearest health centre are DPT (Diphtheria, Pertusis, and Tetanus), polio vaccine, hepatitis B, MMR (Measles, Mumps, and Rubella), jaundice, typhoid, etc.
Of all these diseases, jaundice and typhoid are major health problems

Exercise

 

Question 1. How many times did you fall ill in the last one year? What were the illnesses?
(a) Think of one change you could make in your habits in order to avoid any of/ most of the above illnesses.
(b) Think of one change you would wish for in your surroundings in order to avoid any of/most of the above illness.


Answer: The illness was 2-3 times, common-cold, occurred in a year.
(a) One change I would make in my habits in order to avoid the above illness is that I would take proper diet rich in vitamin C and would avoid too cold food.
(b) The surroundings should be neat, and clean,

 

Question 2. A doctor/nurse/health worker is exposed to more sick people than others in the community. Find out how she/he avoids getting sick herself/himself?


Answer: A doctor/nurse/health worker when exposed to sick people they keep their nose and mouth covered, take care of hygiene, wash hands with soap before drinking water or eating food. They use mask, gloves, etc to avoid the direct contact with the person suffering from infectious diseases.

 

Question 3. Conduct a survey in your neighbourhood to find out what the three most common diseases are. Suggest three steps that could be taken by your local authorities to . bring down the incidence of these diseases.


Answer:

Common-diseases In neighbourhood Steps to bring down the diseases spread
1. Malaria

 

2. Typhoid

3. Cough and cold

1. Clean surrounding

2. Clean drinking water

3. Childhood immunisation

 

Question 4. A baby is not able to tell bis/her.caretakers that she/he is sick. What would help us to find out
(a) that the baby is sick?
(a) what is the sickness?


Answer:
(a) The symptoms like body temperature, fever, cough, cold, loose-motions, non-stop crying improper or no food intake etc. would help up to find that the baby is sick.
(b) The symptoms could help us to find out the sickness of the body.

Question 5. Under which of the following conditions is a person most likely to fall sick?
(a) When she is recovering from malaria.
(b) When she has recovered from malaria and is taking care of someone suffering from chicken-pox.
(c) When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox.
Why?


Answer: (c) When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox.
As the person is not taking proper diet which is required for her proper health and healing of body.
Her chances of getting chicken-pox also high as her body’s immunity has lowered.

 

Question 6. Under which of the following conditions are you most likely to fall sick?
(a) When you are taking examinations.
(b) When you have travelled by bus and train for two days.
(c) When your friend is suffering from measles.
Why?


Answer: (c) When your friend is suffering from measles, as it is an infectious disease.

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NCERT SOLUTIONS FOR CLASS 9 | Ch 12 Sound Science | EDUGROWN

We have solved every question stepwise so you don’t have to face difficulty in understanding the solutions. It will also give you concepts that are important for overall development of students. Class 9 Ch 12 Sound Written Solutions  & Video Solution will be useful in higher classes as well because variety of questions related to these concepts can be asked so you must study and understand them properly

NCERT Solutions for Class 9 Ch 12 Sound Science

In Text Questions

Page No: 162

1. How does the sound produced by a vibrating object in a medium reach your ear?

 
Answer
 

When an object vibrates, it sets the particles of the medium around it vibrating. The particles in the medium in contact with the vibrating object displace from its equilibrium position. It then exerts force on the adjacent particles. After displacing the adjacent particle the first particle of medium comes back in its original position. This process continues in the medium till the sound reaches your ear.

Page No: 163

1. Explain how sound is produced by your school bell.

Answer

When the bell continues to move forward and backward, it creates a series of compressions and rarefactions making production of sound.

2. Why are sound waves called mechanical waves?

Answer

Sound waves needs material medium to propagate therefore, they are called mechnical waves. Sound waves propagate through a medium because of theinteraction of the particles present in that medium.

3. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?

Answer

No, because sound waves needs a medium through which they can propagate. Since there is no material medium on the moon due to absence of atmosphere, you cannot hear any sound on the moon.

Page No: 166

1. Which wave property determines (a) loudness, (b) pitch?

Answer

(a) Amplitude

(b) Frequency


2. Guess which sound has a higher pitch: guitar or car horn?

Answer

Guitar has a higher pitch than car horn, because sound produced by the strings of guitar has high frequency than that of car horn. High the frequency higher is the pitch.

 
1. What are wavelength, frequency, time period and amplitude of a sound wave?

Answer

→ Wavelength: The distance between two consecutive compressions or two consecutive rarefactions is known as the wavelength. Its SI unit is metre (m).

→ Frequency: The number of complete oscillations per second is known as the frequency of a sound wave. It is measured in hertz (Hz).

→ Amplitude: The maximum height reached by the crest or trough of a sound wave is called its amplitude.
 

2. How are the wavelength and frequency of a sound wave related to its speed?

Answer

Speed, wavelength, and frequency of a sound wave are related by the following equation:
Speed (v) = Wavelength (λ) x Frequency (ν)
v = λ x ν

3. Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.

Answer

Frequency of the sound wave, ν= 220 Hz
Speed of the sound wave, v = 440 m s-1
For a sound wave,
Speed = Wavelength x Frequencyv = λ x ν
∴ λ= v / ν = 440 / 220 = 2m
Hence, the wavelength of the sound wave is 2 m.

4. A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?

Answer

The time interval between two successive compressions is equal to the time period of the wave. This time period is reciprocal of the frequency of the wave and is given by the relation:T= 1 / Frequency = 1/ 500 = 0.002 s

1. Distinguish between loudness and intensity of sound.

Answer

Intensity of a sound wave is defined as the amount of sound energy passing through a unit area per second. Loudness is a measure of the response of the ear to the sound. The loudness of a sound is defined by its amplitude. The amplitude of a sound decides its intensity, which in turn is perceived by the ear as loudness.

Page No: 167

1. In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?

Answer

The speed of sound depends on the nature of the medium. Sound travels the fastest in solids. Its speed decreases in liquids and it is the slowest in gases. Therefore, for a given temperature, sound travels fastest in iron.

Page No: 168

1. An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?

Answer

Speed of sound, v = 342 m s−1
Echo returns in time, t = 3 s
Distance travelled by sound = v × = 342 × 3 = 1026 m
In the given time interval, sound has to travel a distance that is twice the distance of the reflecting surface and the source.

 


Hence, the distance of the reflecting surface from the source= 1026 / 2 m = 513 m.

Page No: 169

1. Why are the ceilings of concert halls curved?

Answer

Ceilings of concert halls are curved so that sound after reflection (from the walls) spreads uniformly in all directions.

Page No: 170

1. What is the audible range of the average human ear?

Answer

The audible range of an average human ear lies between 20 Hz to 20,000 Hz.

2. What is the range of frequencies associated with
(a) Infrasound?
(b) Ultrasound?

Answer

(a) Infrasound has frequencies less than 20 Hz.
(b) Ultrasound has frequencies more than 20,000 Hz.

Page No: 172

1. A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

 
Answer
 

Time taken by the sonar pulse to return, t = 1.02 s
Speed of sound in salt water, v = 1531 m s – 1
Distance of the cliff from the submarine = Speed of sound x Time taken
Distance of the cliff from the submarine = 1.02 x 1531 = 1561.62 m

 

Distance travelled by the sonar pulse during its transmission and reception in water = 2 x Actual distance = 2d

Actual Distance, d= Distance of the cliff from the submarine/2
= 1561/2
= 780.31 m

Excercise
 
1. What is sound and how is it produced?

Answer

Sound is a form of eneergy which gives the sensation of hearing. It is produced by the vibrations caused in air by vibrating objects.

2. Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

Answer

When a vibrating body moves forward, it createsa region of high pressure in its vicinity. This region of high pressure is known as compressions. When it moves backward, it creates a region of low pressure in its vicinity. This region is known as a rarefaction. As the body continues to move forward and backwards, it produces a series of compressions and rarefactions. This is shown in below figure.

Series of compressions and rarefactions
 
3. Cite an experiment to show that sound needs a material medium for its propagation.
 
Answer
 
Take an electric bell and an air tight glass bell jar connected to a vacuum pump. Suspend the bell inside the jar, and press the switch of the bell. You will be able to hear the bell ring. Now pump out the air from the glass jar. The sound of the bell will become fainter and after some time, the sound will not be heard. This is so because almost all air has been pumped out.This shows that sound needs a material medium to travel.

Experiment Figure
 
4. Why is sound wave called a longitudinal wave?
 
Answer
 
Sound wave is called longitudinal wave because it is produced by compressions and rarefactions in the air. The air particles vibrates parallel to the direction of propagation.
 
5. Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?

Answer

The quality or timber of sound enables us to identify our friend by his voice.

6. Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

Answer

The speed of sound (344 m/s) is less than the speed of light(3 x 108 m/s). Sound of thunder takes more time to reach the Earth as compared to light. Hence, a flash is seen before we hear a thunder.
7. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s−1.

Answer

For a sound wave,
Speed = Wavelength x Frequencyv = λ x ν
Speed of sound in air = 344 m/s (Given)
(i) For, ν= 20 Hz
λ1= v/ν = 344/20 = 17.2 m

(ii) For, ν= 20000 Hz
λ2= v/ν = 344/20000 = 0.172 m

Hence, for humans, the wavelength range for hearing is 0.0172 m to 17.2 m.

8. Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Answer

Velocity of sound in air= 346 m/s
Velocity of sound wwave in aluminium= 6420 m/s
Let length of rode be 1

Time taken for sound wave in air, t1= 1 / Velocity in air
Time taken for sound wave in Aluminium, t2= 1 / Velocity in aluminium
 

Therefore, t1 / t2 = Velocity in aluminium / Velocity in air = 6420 / 346 = 18.55 : 1

9. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Answer

Frequency = 100 Hz (given)
This means the source of sound vibrates 100 times in one second.
Therefore, number of vibrations in 1 minute, i.e. in 60 seconds = 100 x 60 = 6000 times.

10. Does sound follow the same laws of reflection as light does? Explain.

Answer

Sound follows the same laws of reflection as light does. The incident sound wave and the reflected sound wave make the same angle with the normal to the surface at the point of incidence. Also, the incident sound wave, the reflected sound wave, and the normal to the point of incidence all lie in the same plane.

11. When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

Answer

An echo is heard when the time for the reflected sound is heard after 0.1 s
Time Taken= Total Distance / Velocity
On a hotter day, the velocity of sound is more. If the time taken by echo is less than 0.1 sec it will not be heard.

12. Give two practical applications of reflection of sound waves.

Answer

Two practical applications of reflection of sound waves are:
→ Reflection of sound is used to measure the distance and speed of underwater objects. This method is known as SONAR.
 

→ Working of a stethoscope is also based on reflection of sound. In a stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ear by multiple reflection of sound.

13. A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m s−2 and speed of sound = 340 m s−1.

Answer

Height of the tower, s = 500 m
Velocity of sound, v = 340 m s−1
Acceleration due to gravity, g = 10 m s−2
Initial velocity of the stone, u = 0 (since the stone is initially at rest)
Time taken by the stone to fall to the base of the tower, t1
According to the second equation of motion:


Now, time taken by the sound to reach the top from the base of the tower, t2= 500 / 340 = 1.47 s
Therefore, the splash is heard at the top after time, t
Where, t= t1 + t2 = 10 + 1.47 = 11.47 s.

14. A sound wave travels at a speed of 339 m s−1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

Answer

Speed of sound, v= 339 m s – 1
Wavelength of sound, λ= 1.5 cm = 0.015 m
Speed of sound = Wavelength x Frequencyv= λ x v
∴ v= v / λ = 339 / 0.015 = 22600 Hz
The frequency range of audible sound for humans lies between 20 Hz to 20,000 Hz. Since the frequency of the given sound is more than 20,000 Hz, it is not audible.
 
Page No: 175

15. What is reverberation? How can it be reduced?

Answer

The repeated multiple reflections of sound in any big enclosed space is known as reverberation.
The reverberation can be reduced by covering the ceiling and walls of the enclosed space with sound absorbing materials, such as fibre board, loose woollens, etc.
 


16. What is loudness of sound? What factors does it depend on?

Answer

The effect produced in the brain by the sound of different frequencies is called loudness of sound.
Loudness depends on the amplitude of vibrations. In fact, loudness is proportional to the square of the amplitude of vibrations.

17. Explain how bats use ultrasound to catch a prey.

Answer

Bats produce high-pitched ultrasonic squeaks. These high-pitched squeaks are reflected by objects such as preys and returned to the bat’s ear. This allows a bat to know the distance of his prey.

18. How is ultrasound used for cleaning?

Answer

Objects to be cleansed are put in a cleaning solution and ultrasonic sound waves are passed through that solution. The high frequency of these ultrasound waves detaches the dirt from the objects.

19. Explain the working and application of a sonar.

Answer

SONAR is an acronym for Sound Navigation And Ranging. It is an acoustic device used to measure the depth, direction, and speed of under-water objects such as submarines and ship wrecks with the help of ultrasounds. It is also used to measure the depth of seas and oceans.

Sonar Working
 
 
A beam of ultrasonic sound is produced and transmitted by the transducer (it is a device that produces ultrasonic sound) of the SONAR, which travels through sea water. The echo produced by the reflection of this ultrasonic sound is detected and recorded by the detector, which is converted into electrical signals. The distance (d) of the under-water object is calculated from the time (t) taken by the echo to return with speed (v) is given by 2d = v × t. This method of measuring distance is also known as ‘echo-ranging’.

20. A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

Answer

Time taken to hear the echo, t= 5 s
Distance of the object from the submarine, d= 3625 m
Total distance travelled by the sonar waves during the transmission and reception in water= 2d
Velocity of sound in water, v= 2t = 2 x 3625 / 5 = 1450 ms-1.

21. Explain how defects in a metal block can be detected using ultrasound.

Answer

Defects in metal blocks do not allow ultrasound to pass through them and they are reflected back. This fact is used to detect defects in metal blocks. Ultrasound is passed through one end of a metal block and detectors are placed on the other end. The defective part of the metal block does not allow ultrasound to pass through it. As a result, it will not be detected by the detector. Hence, defects in metal blocks can be detected using ultrasound.

Ultrasound Waves helpful in detecting metal defects
 
22. Explain how the human ear works.
 
Answer
 
The human ear consists of three parts – the outer ear, middle ear and inner ear. 
→ Outer ear: This is also called ‘pinna’. It collects the sound from the surrounding and directs it towards auditory canal.
→ Middle ear: The sound reaches the end of the auditory canal where there is a thin membrane called eardrum or tympanic membrane. The sound waves set this membrane to vibrate. These vibrations are amplified by three small bones- hammer, anvil and stirrup. 
→ Inner ear: These vibration reach the cochlea in the inner ear and are converted into electrical signals which are sent to the brain by the auditory nerve, and the brain interprets them as sound.

Working of human ear

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