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Question

In Nereis, swarming occurs at night for

A
Copulation
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B
Shedding of sperms and ova
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C
Attaining sexual maturity
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D
None of the above
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Solution

The correct option is B Shedding of sperms and ova
Reproduction in Nereis occurs during summer. Sexually mature worms leave their burrows and swim on the sea surface in large numbers known as swarming. Swarming occurs at night during a certain phase of the moon. The males swim rapidly around the females and gametes are shed in the water. Fertilization is external. Both sexes die after shedding of gametes.
Therefore, the correct answer is option B.

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