Commercial silk is obtained from

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(A) Commercial silk is obtained from the $Cocoon$ stage of the silk moth $(Bombyx 	ext{ } mori)$.During the pupal stage, the caterpillar secretes a p

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Cocoon/pupa

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(A) Commercial silk is obtained from the $Cocoon$ stage of the silk moth $(Bombyx 	ext{ } mori)$.During the pupal stage, the caterpillar secretes a proteinaceous substance through its salivary glands, which hardens upon exposure to air to form the silk fiber that wraps around the pupa to create the $Cocoon$.This $Cocoon$ is then processed to extract the silk thread.

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