Assertion :Cold blooded animals do not have fat layer. Reason: Cold blooded animals use their fat for metabolic process during hibernation.

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.
Assertion is correct as, cold blooded animals do not have fat layer. They cannot keep their body temperature constant, instead it is close to that of their surroundings, so when their body temperature is high, for example on a hot summer's day, they can be very active, but when it is low, for example on a cold winter's night, they can produce energy only slowly.
Reason is also correct and correct explanation of assertion as, cold blooded animals use their fat for metabolic process during hibernation. Thus, they do not need to have any extra insulation like blubber as found in Whales. Therefore, the correct answer is option A.

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