Chapter 1 Crop Production and Management mcqs & important questions science | class 8th

MCQ Questions for Class 8 Science: Ch 1 Crop Production and Management

1. Weedicides are used to destroy:

(a) insects

(b) weeds

(c) pests

(d) none of these

► (b) weeds

2. Cutting mature crop manually or by a machine is called:

(a) Irrigating

(b) Harvesting

(c) Breeding

(d) Weeding

► (b) Harvesting

3. Grains are separated from stalks by a process called________

(a) Harvesting

(b) Threshing

(c) Weeding

(d) Winnowing

► (b) Threshing

4. The medium of growth for plants is :

(a) Cell

(b) Soil

(c) Water

(d) Air

► (b) Soil

5. Breeding, rearing and management animals for human use is :

(a) Aniculture

(b) Animal husbandry

(c) Animal culture

(d) None of these

► (b) Animal husbandry

6. The rearing of honey bees on large scale is called:

(a) sericulture

(b) tissue culture

(c) pisciculture

(d) apiculture

► (d) apiculture

7. Any plant cultivated at a large stretch of land is called :

(a) Crop

(b) Weed

(c) Cereal

(d) Fibre

► (a) Crop

8. Watering the crops is called:

(a) sowing

(b) manuring

(c) tilling

(d) irrigation

► (d) irrigation

9. Crop plants may be attacked by pests which affect the crop production. Fungi are such type of pests which cause diseases like

(a) Smut of wheat

(b) Citrus canker

(c) Blight of potato

(d) Both (a) and (c)

► (d) Both (a) and (c)

10. The manure prepared from green plants is :

(a) FYM

(b) Compost

(c) Green manure

(d) all the above

► (c) Green manure

11. Which of the following tools would a farmer use to remove weeds from the field?

(a) Hoe

(b) Axe

(c) Plough

(d) Cultivator

► (a) Hoe

12. Take a beaker and fill half of it with water. Put some wheat seeds in it, stir it and wait for some time. Which of the following holds true regarding the observation and inference of this experiment?

(a) Healthy seeds being lighter float on the surface of water.

(b) Damaged seeds being lighter float on the surface of water.

(c) Some healthy seeds and some damaged seeds float on the surface of water.

(d) Damaged seeds being heavier settle down at the bottom.

► (b) Damaged seeds being lighter float on the surface of water.

13. Combines are used for:

(a) sowing of seeds

(b) harvesting the crops

(c) threshing

(d) harvesting and threshing both

► (d) harvesting and threshing both

14. Peas are rich in:

(a) vitamins

(b) carbohydrates

(c) proteins

(d) fats

► (c) proteins

15. Improper use of fertilizers can cause:

(a) soil alkalinity & soil acidity

(b) soil acidity only

(c) soil acidity and soil erosion

(d) soil erosion

► (a) soil alkalinity & soil acidity

16. The system of irrigation wherein water is supplied drop by drop near the roots of plants, is called

(a) Sprinkler system

(b) Pulley system

(c) Lever system

(d) Drip system

► (d) Drip system

17. Wheat and gram belong to

(a) Rabi crops

(b) Kharif crops

(c) Both of these

(d) None of these

► (a) Rabi crops

18. The agricultural implement used for removing weeds and for loosening soil is :

(a) Combine

(b) Drill

(c) Hoe

(d) Cultivator

► (c) Hoe

19. The cutting and gathering of crop after it is matured is called X. After this, grains are separated from the crop by a process called Y. Z is the process of separating the hay and chaff from the grains. Which of the following statements is/are correct regarding X, Y and Z?

(a) Z is done with the help of wind in which grains along with husk is allowed to fall from a height.

(b) X is done mechanically by combine and manually by plough and harrow.

(c) X is the process known as threshing whereas Y is the process known as winnowing.

(d) Both (a) and (b)

► (a) Z is done with the help of wind in which grains along with husk is allowed to fall from a height.

20. Examples of kharif crops are

(a) Wheat and maize

(b) Gram and maize

(c) Paddy and maize

(d) All of these

► (c) Paddy and maize

21. Seed drill is used to

(a) sow the seeds

(b) remove the weeds

(c) remove the pest

(d) mix manure in the soil

► (a) sow the seeds

22. Cereals provide us mainly :

(a) carbohydrates

(b) proteins

(c) fats

(d) fibre

► (a) carbohydrates

23. Food provides _________ and materials required for the growth and maintenance of our body

(a) energy

(b) nutrition

(c) power

(d) none of the above

► (a) energy

24. Coconut provides us mainly :

(a) fat

(b) milk

(c) protein   

(d) carbohydrate

► (c) protein   

Crop Production and Management Class 8 Extra Questions Short Answer Type

Question 1.
What is a crop?
Answer:
Crop is the term used to describe a plant that is grown in a field on a large scale. For example, cereal crops, wheat crops.

Question 2.
What do you mean by produce?
Answer:
The products obtained from the crops are called produce.

Question 3.
What do you mean by the term agricultural practice?
Answer:
Agricultural practices are those practices which involve the necessary steps to be taken during production of crops.

Question 4.
Explain the term levelling.
Answer:
Levelling is the process of breaking down the larger lumps of soil, and then levelling them by using a leveller.

Question 5.
What are the advantages of levelling?
Answer:
Following are the advantages of levelling:

• Levelling helps to prevent soil erosion caused by wind or air.
• It helps in sowing the seeds uniformly, and thus helps the plants to grow uniformly too.
• It helps in proper irrigation by allowing the water to get distributed uniformly throughout the soil.

Question 6.
What is a plough?
Answer:
A plough is an equipment for ploughing. It is mainly made of a wooden shaft called a plough-shaft, attached to a triangular iron blade called ploughshare.

Question 7.
What is a cultivator?
Answer:
Cultivator is a farm implement used for stirring and pulverizing the soil for planting crops.

Question 8.
Explain the term transplantation.
Answer:
Some of the crops are first grown in the nurseries and then transferred to the main field. This process is known as transplantation.

Question 9.
What are the advantages of manure?
Answer:
Following are some advantages of manure:

• It enhances water-holding capacity of soil.
• It improves soil quality.
• It promotes the growth of soil friendly microbes.
• It is renewable, biodegradable and eco-friendly.

Question 10.
What are weedicides? Give some examples.
Answer:
Weedicides are the chemicals that are used to remove weeds. Some commonly used weedicides are 2, 4-D and metachlor.

Crop Production and Management Class 8 Extra Questions Long Answer Type

Question 1.
What do you mean by the term crop? Explain briefly the types of crops.
Answer:
Crop is the term used to describe a plant that is grown in a field on a large scale. For example, cereal crops, pulses and fruit crops. The crops grown in India can be classified as kharif and rabi.

Kharif crops are sown in the rainy season by June/July and are harvested by September/October. Thus they are also known as summer season crops. For example, rice, maize, etc.

Rabi crops are sown in the winter season in October or November and are harvested by March/April. Thus, they are also called winter season crops. For example, mustard, wheat, potato, etc.

Question 2.
What is ploughing or tilling? State its advantages.
Answer:
The process of loosening and turning of the soil is called tilling or ploughing. This is done by using a plough. Ploughs are made of wood or iron. Following are the advantages of ploughing or tilling:

• Ploughing loosens the soil and makes it aerated.
• It helps in mixing organic matter with the soil uniformly.
• It initiates the growth of natural agents and microorganisms and thus, keeps the soil fertile.
• It increases the water holding capacity of soil.
• It helps in easy penetration of root into the soil.

Question 3.
Define the term agricultural practices and also state the important steps taken during crop production.
Answer:
Agricultural practices are those practices which involves the necessary steps to be taken during production of crops. There are number of steps of crop production which are to be done very carefully to ensure that crops get produced timely. Some of the most important steps taken during crop production are as under:

• Soil preparation
• Sowing
• Adding manure and fertilisers
• Irrigation
• Weeding
• Harvesting
• Threshing and winnowing
• Storage of grains

Question 4.
What is irrigation? Name the two main methods of irrigation and define them briefly.
Answer:
The artificial method of watering the plants for assisting in the growth of the plants is called irrigation. The two main methods of irrigation are:
(i) Traditional method: The traditional method of irrigation is very less expensive and they often lead to wastage of water. Traditional method of irrigation involves chain pump, dhekli, moat (the pulley system) and rahat (lever system).

(ii) Modern method: Modern methods of irrigation are more inclined towards the use of diesel, bio¬gas, solar energy and electricity for lifting water.
The two most important modern system of irrigation are:

• Sprinkler irrigation system
• Drip irrigation system

Question 5.
What do you mean by weeding? Why the process of weeding necessary? Name the methods applied for weeding.
Answer:
The undesirable plants that grow among the crops are called weeds. The process of removing these weeds is known as weeding. Weeds compete with the crop plants for nutrients and space. They grow much rapidly than the crop plant. So weeding is necessary.

Methods applied for weeding are as follows:
(i) Manual method: Manual method of removing weeds is the most time consuming method. In this system weeds are controlled by hand pulling, digging, shallow tillage, etc., by using certain implements like khurpi, hoe, etc.

(ii) Chemical method: In this method chemicals called, weedicides are used to remove weeds. For example, metachlor and 2, 4-D.

(iii) Biological control method: This method is the most commonly used method of weed control. It involves the use of some specific insects that destroy the growth of some specific weeds. For example, leafy spurge, a weed, is controlled by using flea beetles.

Question 6.
Write short note on the terms:
(i) Storage
(ii) Harvesting
Answer:
(i) Storage: Storage of produce is an important task. If the crop grains are to be kept for longer time, they should be safe from moisture, insects, rats and microorganisms. Before storing, the grains are properly dried in the sun to reduce the moisture in them. This prevents the attack by insect pests, bacteria and fungi. Grains are stored by farmers in jute bags or metallic bins. However, large scale storage of grains is done in silos and granaries to protect them from pests like rats and insects.

(ii) Harvesting: After maturation of crop, harvesting is an important task. In harvesting, crops are pulled out or cut close to the ground. It usually takes 3 to 4 months for a cereal crop to mature. Harvesting in our country is either done manually by sickle or by machine called harvester.

Crop Production and Management Class 8 Extra Questions HOTS

Question 1.
Why the depth at which seeds are planted is important?
Answer:
If the seed is planted too deep then it will not get enough sunlight to germinate. If the seed is planted too shallow then it will not get enough soil to support germination. The depth for sowing seed also depends upon the seed size.

Question 2.
Why sowing seeds with seed drill is better than broadcasting?
Answer:
Seed drill sows the seeds uniformly at proper distances and depths, whereas broadcasting of seeds scatter them non-uniformly on the ground surface which are susceptible to be picked up by birds.

Question 3.
How can nitrogen be replenished in soil naturally?
Answer:
Through crop rotation with a leguminous crop the nitrogen can be replenished in soil naturally. The leguminous plants, like peas, beans, soybeans, peanuts, etc., have nitrogen-fixing bacteria in their root nodules. The nitrogen-fixing bacteria, viz., Rhizobium, fixes atmospheric nitrogen (N₂) into ammonium (NH₄₊) which is used by the plants.

Question 4.
Why is it advisable to wash fruits and vegetables before using them?
Answer:
Fruits and vegetables may contain many pesticides, used during the crop production practices, on them along with other germs and dust.

Question 5.
What is biological control of pest? How is it beneficial?
Answer:
Method of controlling pests including insects, mites, weeds, etc., with the help of other living organisms are known as biological control of pest. The controlling agents are very much particular of their host pest. For example, lady bugs controls aphids, mites, scale insects, etc., which harm the crops. A wasp eats up bollworms or other caterpillars on cotton plant.
Benefits of biocontrol agents are:

• Less costly
• Give protection to the crop throughout the crop period
• Eco-friendly
• Harmless to human beings and beneficial to flora and fauna