Which of the following is absent in phylum Echinodermata?

Coelom

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Vascular system

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Excretory organs

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Respiratory organs

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Solution

The correct option is D Excretory organs
The echinoderms possess enterocoel. The adult echinoderms possess a water vascular system with external tube feet and a calcareous endoskeleton. The echinoderms do not have 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 for excretion.
Therefore, the correct answer is option C.

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