Assertion :The birds have large, light spongy bones with air sacs. Reason: These adaptations help them during flight.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Air sacs of birds extend their diverticula into the medullary cavity of bones and these bones are termed as pneumatic bones. The presence of air sacs/ sinuses makes these bones are lighter in weight and thus serve as an adaptation to the flying ability of an Aves. Both Assertion and Reason are correct and the reason is the correct explanation of Assertion.

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