why is it necessary to kill pupa by boiling cocoons in water
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29
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.
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16
It is necessary to kill pupa by boiling cocoons so that the rest of the processes (I.e. scouring ,spurning and dying ) get easily carried off.
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