at pupal stage silk worms are killed to get fibre, why
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Answer:
This is because if the silkworm (as pupa) is allowed to mature into a silk moth, then the fully formed silk moth secretes a liquid to dissolve a part of silk of the cocoon to break it so as to come out of it and fly away.
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Explanation:
In the life cycle of the silkworm the silkworm is killed at the stage of pupa because pupa is covered with silk and we kill silkworm to obtain silk fibres from them.
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