Radial symmetry is not found in adults of phylum

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Ctenophora

Echinodermata

Coelenterata

Hemichordata

answer is C.

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Detailed Solution

Adult hemichordates exhibit bilateral symmetry. Their body can be divided into identical right and left halves only by medial sagittal plane. Radial symmetry is the type of symmetry in which the body can be divided into identical halves by any plane passing through the central axis (oral-aboral axis). It is found in cnidarians, ctenophores and adult echinoderms. Bilateral symmetry is the type of symmetry in which the body can be divided into identical right and left halves only by one plane, i.e., medial sagittal plane.
(1) Adult echinoderms exhibit radial symmetry. Their larval stages exhibit bilateral symmetry.
(2) Ctenophores exhibit radial symmetry both in larval stage and adult stage.
(4) Coelenterates exhibit radial symmetry both in larval stage and adult stage.

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