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Every 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
Read MoreAll animals require food for obtaining energy, growth, repair of damaged parts and functioning of the body. The process of taking food by an animal and its utilisation in the body is called animal nutrition. Plants can prepare their own
Read MoreAll living organisms require food. The food gives energy to the organisms for growth and maintenance of their body functions. Carbohydrates, proteins, fats, vitamins and minerals are the components of food. These components of food are necessary for our body
Read MoreRevision Notes on Visualising Solid Shapes Plane Figures (2-Dimensional Shape) The figures which we can draw on a flat surface are called Plane Figures. They have two dimensions i.e. length and breadth, hence these are called 2 Dimensional Shapes. Solid Figures (3-Dimensional Shape)
Read MoreRevision Notes on Symmetry Symmetry If two or more parts of a figure are identical after folding or flipping then it is said to be symmetry. To be symmetrical the two halves of a shape must be of same shape and size.
Read MoreRevision Notes on Exponents and Powers Introduction to Exponents and Powers When the numbers given are very large like 54,32,00,00,000 then it is not easy to read them so we write them in the form of exponents. Exponents make these numbers
Read MoreAn Algebraic Expression is the combination of constant and variables. We use the operations like addition, subtraction etc to form an algebraic expression. Variable A variable does not have a fixed value .it can be varied. It is represented by
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