Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).

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Both assertion and reason are correct and reason is the correct explanation of assertion.

Both assertion and reason are correct and reason is not the correct explanation of assertion.

Assertion is correct but reason is incorrect.

Both assertion and reason are incorrect.

answer is B.

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Detailed Solution

Nereis is dioecious but earthworms and leeches are monoecious. Nereis has parapodia but earthworms and leeches lack parapodia. Parapodia are the lateral appendages of aquatic annelids like Nereis, which help in swimming locomotion. Their presence or absence is not related to the sexuality (dioecious or monoecious). Setae are useful for locomotion in earthworms. Leeches use suckers for locomotion.

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