Assertion :In amphibians, heart is two chambered. Reason: The deoxygenated blood is returned to the heart through sinus venous.

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 but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
The assertion is incorrect as amphibians' heart is three chambered having two atria and one ventricle and not two chambered which is a characteristic of fishes.
The reason is correct as deoxygenated blood is returned to the heart into the right atrium through sinus venous.
Therefore, the correct answer is option D.

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