Assertion :In Ascaris second stage larva is infective. Reason: Rhabditiform larva is the larva of Ascaris.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The zygote of Ascaris develops into the larval stage by cleavage under suitable conditions of temperature, moisture and oxygen. The larva of the Ascaris is known as rhabditiform larva. It further develops into the second stage of larva, which is ineffective. When it reaches the liver as man eats the eggs of Ascaris from contaminated food and water, it develops into 3rd and 4th larva subsequently which is the effective stage and thus causes ascariasis. Hence, option B is correct.

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