Assertion :Pharyngeal nephridia play a role in the conservation of water in the earthworm. Reason: They help the earthworm in keeping the skin moist for cutaneous respiration.

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 C Assertion is correct but Reason is incorrect.
Pahryngeal nephridia occur in three pairs of bunches in the $4$ th, $5$ th and $6$ th segments lying on each side of the alimentary canal. The ducts of the nephridia of the sixth segment open into the pharynx. These ducts carry excretory products from the pharyngeal nephridia into the gut. Enteronephric condition is an adaptation for the conservation of water which is absorbed by the inner lining of alimentary canal.
Ectonephric nephridia discharge their contents directly to the outside which help the earthworm in keeping the skin moist for cutaneous respiration only. Integumentary nephridia are ectonephric nephridia while, pharyngeal and septal nephridia are enteronephric.

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