Assertion :Bats and whales are classified as mammals. Reason: Bats and whales have four-chambered hearts.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Bats and whales are classified as mammals. Whales are warm-blooded, breath air through lungs and give birth to live young that suck on the milk secreted from the mother's mammary glands. Bats have hair, are viviparous and feed young ones on milk produced in mammary glands. They are the only true flying mammals.
They have four-chambered hearts which is also present in Aves. They are classified as mammals as they show the presence of diaphragm and mammary glands.
Therefore, the correct answer is option B.

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