Question

why should the silkworm be killed by placing the cocoons in boiling water?​

Answer 1

$\huge\mathcal{Answer:}$

Hence, the cocoons are kept in boiling water to kill the silkworms so that they do not pierce and damage the cocoon when they emerge from it (Cruelty-free silk or peace silk, 2011).

Answer 2

Answer:

at cocoon stage it forms to butterfly by metamorphosis

Explanation:

1. killing at that stage we get silk and silk become loose by boiling in water