Assertion :Osteichthyes fishes swim constantly to avoid sinking. Reason: Air bladder is absent in fishes of Class Osteichthyes.

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 D Both Assertion and Reason are incorrect
Members of Class Chondrichthyes are marine with streamlined body having cartilaginous endoskeleton. Due to the absence of air bladder, they have to swim constantly to avoid sinking. Air bladder is present in Osteicthyes which regulates buoyancy.

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