The endoskeleton of echinoderms is unique with respect to other invertebrates by having ........... in origin.

Ectoderm

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Mesodermal

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Endodermal

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Meso-endodermal

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Solution

The correct option is B Mesodermal
A true endoskeleton is derived from the mesodermal tissue. Such a skeleton is present in echinoderms and chordates. Echinoderms are the only exception is the invertebrates to have a mesodermal skeleton composed of calcareous plates or ossicles.
Therefore, the correct answer is option B.

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