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      Question

      The silk fibres are held together in cocoon by a

      substance known as ______________.
      A Sericin Correct Answer Incorrect Answer
      B Cement Correct Answer Incorrect Answer
      C Glue Correct Answer Incorrect Answer
      D Fibroin Correct Answer Incorrect Answer
      E None Correct Answer Incorrect Answer

      Solution

      The silk fibres are held together in cocoon by a substance known as sericin which is secreted by middle gland of the salivary gland (silk glands) of silk worm.

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