Question

Rearing of silkworms: A female silk moth lays hundreds of eggs which are stored at a suitable temperature. These eggs produce silkworms which feed on fresh mulberry leaves for 25-30 days and grow in size.

They secrete a liquid which hardens on coming in contact with air and changes into a fine thread called silk which is made up of a protein. The caterpillar covers itself completely with these fine fibres. This covering is called as cocoon. The silkworm develops into a silk moth inside the cocoon.