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Most material from which cloth are made plants. You also learnt that wool and silk fibres are obtained from animals. Wool is obtained from the rip off (tresses) of sheep or yak. Silk fibres come from cocoons of the silk moth. Do you know which part of the sheep’s body yields fibres? Are you aware how these fibres are converted into the woollen yarn that we buy from the market to knit sweaters? Do you have any idea how silk fibres are made into silk, which is woven into saris? NCERT solutions for class 7 Science prepared by Physics Wallah will help you to solve your NCERT text book exercise.