Assertion :Pila has dual mode of respiration. Reason: Pila leads an amphibious life.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Pila is an amphibious animal and carries a single ctenidium on the right side of the branchial chamber. Water currents enter through the left nuchal opening and pass through the right nuchal opening.
For aerial respiration, respiratory siphon of the pulmonary sac is thrust out of the left nuchal opening to inhale outside air into the single pulmonary sac, which is supplied with a network of blood vessels. Inhalation and exhalation are carried out by the muscles that surround the pulmonary sac. So, Assertion is correct and its reason is correct as it leads to amphibious life.
So, the correct answer is option A.

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