Assertion :All birds, except the ones like koel (cuckoo) build nests for retiring and taking rest during night time (day time for nocturnal). Reason: Koel lays its eggs in the nests of tailor bird.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
All birds, except the ones like koel (cuckoo) build nests for retiring and taking rest during night time (day time for nocturnal).
Koel (Eudynamys) lays eggs in crow's nest for incubation and rearing of their young ones and not tailor bird.
Therefore, the correct answer is option C.

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