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NCERT STD 7 SCIENCE TEST
Physical and Chemical Changes We see different types of changes; every day in our surrounding. Growth of tree, rising of sun, setting of sun, different shape and size of moon, burning of coal, p…
Acid Base Salt Substances can be divided into three types – Acid, Base and Salt. ACID: Taste of acid is sour. There are many substances that contain acid and so taste sour. For example – lemon…
Heat Heat is the transfer of energy from a hot body. The sense of touch can be used to understand the degree of hotness or coldness of something. But the sense of touch is not reliable and canno…
Animal fibres → Wool and silk fibres are obtained from animals. → Wool is obtained from the fleece (hair) of fleece sheep or yak. Silk fibres come from cocoons of the silk moth. Wool → Woo…
Introduction In the previous chapter we learned that plants can prepare their own food by photosynthesis but animals cannot. Animals get their food from plants, either directly by eating plant…
Introduction All living organisms such as plants and animals require food. So food is essential for all living organisms. Plants are capable of making their food themselves but humans and an…
