Question

Answer This Question According To Class 7 Science C.B.S.E. Board.

Answer 1

it keeps us warm as wool traps air in it as it's a insulator or air .
many layer of clothing also react the same way.

Answer 2

wool is poor conductor of heat.so in winterwe wear woolen clothes.the wool fibres trap the air in between them.this air prevents the flow of heat from our body to the cold surroundings.so we will feel warm