what is the importance of cocoon (puoa) stage in the life cycle of silkworm
In this stage the larva stops eating and secretes a sticky fluid called as fibroin from its salivary gland. This fibroin gets hardened when exposed to air and form the silk fibre. The silk fibre is wrapped around its body and forms a case like structure called as cocoon. During this stage the larva becomes pupa which later develops into an adult silk moth.