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All the living organisms including plants and animals have the capability to produce new individuals during their lifespan. This process of producing a new organism from the existing organism (or the parent) of the same species is called reproduction. The
Read MoreIn unicellular organisms, the intake of food, water, oxygen and removal of waste material occur across the cell surface by the process of diffusion. Plants and animals are multicellular. They have a specific organ to perform specific functions. To perform
Read MoreRevision Notes on Respiration in Organisms Why do we respire? All the living organisms are made up of small microscopic units called the cells. These cells have different functions to perform in these organisms such as digestion, respiration, transportation and
Read MoreImportance of Soil Soil allows the growth of plants. It supplies water and nutrients that are required in the growth of plants. The soil is the main part of agriculture. Different types of soils support different kinds of crops. Without
Read MoreWinds – When the air moves in a flow in a particular direction it is called wind. Air Exerts Pressure Why a tin can with hot water when cooled down with freshwater distorts its shape? Figure 1 Air Exerts Pressure As
Read MoreThe weather of a place can be defined as the measure of its daily atmospheric conditions such as humidity, temperature, lightning events, rainfall Storms, snow and so on. Different elements of weather are: Rainfall Temperature Humidity Snowfall Storms Winds etc. Figure 1:
Read MoreEvery day we come across many changes that are taking place all around us. These changes may involve one or more substances. Sometimes, milk becomes sour. Souring of milk is a change. Making a sugar solution is a change. Similarly,
Read MoreAcids An acid is a chemical substance that has a sour taste. Many food items such as lemons, curd, vinegar and orange taste sour because of the presence of acid in them. Acidic Substances are the substances that contain acid in them. Natural
Read MoreRevision Notes on Heat Woollen clothes are obtained from animal fibres. Woollen clothes are generally dark in colour and are worn in the winter season as they protect us from the cold environment. Cotton clothes are obtained from the plant
Read MoreThe wool is obtained mainly from animals like sheep, yak and goat. Wool is acquired from the fleece or hair of these animals. Figure 1: Animals that yield wool Production of Wool from Sheep There are two types of fibres in sheep’s
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