Which of the following are enteronephric nephridia in earthworm?

Integumentary and pharyngeal

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Septa and integumentary

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Pharyngeal and septal

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Integumentary only

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Solution

The correct option is C Pharyngeal and septal
The pharyngeal nephridia form a cylindrical bunch around the oesophagus in the sixth segment and open into the pharynx in front by a large number of ducts. The system of septal excretory canals is more primitive and represents an intermediate stage between the purely exonephric metanephridia of Lumbricus and the elaborate enteronephric system of Pheretima, Lampito, and Woodwardiella.
So, the correct answer is option C.

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