Assertion :Ascaris is a nematode. Reason: Nematodes belong to phylum platyhelminthes.

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 C Assertion is correct but Reason is incorrect.
Ascaris lumbricoides is the giant roundworm of humans, growing to a length of up to 35 cm. It is the largest and most common parasitic worm in humans belong to the Nematoda.
The class Nematodes belongs to phylum Aschelminthes.
Therefore, the correct answer is option C.

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