Out of the following which is the excretory organ of echinoderms?

Nephridium

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Liver

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Organs of Bojanus

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None of the above

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Solution

The correct option is D None of the above
The echinoderms lack specialized excretory or waste disposal organs. So the nitrogenous waste is chiefly in the form of ammonia. Ammonia diffuses out through the respiratory surfaces. They do not have any organ which has been developed from the purpose of excretion.
Therefore, the correct answer is option D.

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