Question

F. Give reasons:
1. Cotton clothes are preferred in summers.
2 2. Wool gives us fluffy or spongy touch.
3. Cocoons are steamed.
4. Artificial fibres do not absorb water.​

Answer 1

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1. We should wear cotton clothes in summer because during summers we tend to sweat a lot and cotton fabric absorbs this sweat and helps the body to cool down. Cotton clothes provide better air circulation leading to more absorption of sweat and thus gives a cooling effect to us.
2. The crimp in wool fibres makes it soft and springy to touch. It also adds bulk and traps a large volume of air between the fibres, giving it good insulation properties.
3. During boiling, some amount of water enters the cocoon cavity and makes it soft. This helps in separating the fibres from cocoon during the reeling process. Due to hot water, pupa dies and does not emerge out of cocoon.
4. Synthetic fibres soak less water than natural fibres because they don't have any hollow space in midst of single fibre. They take less time to dry because the water does not enter in the single fibre of that cloth.

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