Assertion :Air bladder is absent in fishes. Reason: Fishes generally respire through gills.

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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Assertion is incorrect Reason is correct.

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Solution

The correct option is D Assertion is incorrect Reason is correct.
The air bladder or the swim bladder is a gas-filled organ found in bony fishes; it helps in swimming.
Gills are the respiratory organs found in fishes and many aquatic organisms. Gills absorb dissolved oxygen from water and release carbon dioxide.
Thus, the correct answer is option D.

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