Which of the following is not true about Echinoderms?

Calcareous exoskeleton

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Triploblastic

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Radially symmetrical

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Ventral mouth and dorsal anus

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Solution

The correct option is A
Calcareous exoskeleton

Echinoderms are triploblastic, radially symmetrical, and have a ventral mouth and dorsal anus. Their skeletons are made up of interlocking calcium carbonate plates and spines. This skeleton is enclosed by the epidermis and is thus, an endoskeleton, and not an exoskeleton like most invertebrates.

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