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Question

The animals with bilateral symmetry in the young stage and radial pentamerous symmetry in the adult stage belong to the phylum___________

A
Cnidaria
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B
Echinodermata
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C
Annelida
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D
Mollusca
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Solution

The correct option is B Echinodermata
Echinoderms are exclusively marine invertebrate, having some interesting features. Their life cycle is usually complex. In most echinoderms, the embryo develops into a planktonic larva with a bilateral symmetry, that attains a pentaradial symmetry in the adult stage. It has been suggested that a pentamerous arrangement of skeletal parts strengthens the animal's skeleton than would, for example, a three-rayed symmetry.

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Phylum Echinodermata
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