Chemistry, asked by pranjal7, 1 year ago

It is necessary to kill pupa by boiling cocoon in water at right time. Why

Answers

Answered by Anonymous
30
Caterpillars feed on mulberry leaves. After reaching the sufficient size the caterpillar spins a cocoon and spends its pupal stage inside. Cocoons need to be unravelled to get silk. After growing, the caterpillar which must have turned into a butterfly by undergoing metamorphosis must eat its way out the cocoon. So there is very little possibility of getting silk from such a cocoon. To get silk, the cocoons are put in boiling water during the process of which pupae die. Approximately 15 silkworms are killed to make a gram of silk thread, and 10,000 are killed to make a silksari.
Answered by ammu786
18
when it is not done at proper time the pupa may grow into butterfly and we cannot convert it into silk back
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