Question

why are the worms inside the cocoon skill before they are fully grown ?

Answer 1

if we will not kill the worms inside the cocoon at right time then the pupa will convert into silkworm and come out by breaking cocoon which destroys the silk fibre and we will not get silk

Answer 2

Answer:

The silkworms, if allowed to mature fully, will break open the cocoon and damage the threads. So, the worms are killed in advanced