Choose the phylum in which the organisms are bilaterally symmetrical in the larval stage but are radially symmetrical in the adult stage .

Annelida

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Arthropoda

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Mollusca

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Echinodermata

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Solution

The correct option is D Echinodermata
Some echinoderms reproduce asexually by fission. However, most echinoderms reproduce sexually. Eggs hatch into larvae that have bilateral symmetry and can swim. The larvae undergo metamorphosis to change into the adult form. During metamorphosis, their bilateral symmetry changes to radial symmetry. Examples of echinoderms are starfish, sea-cucumber, sea urchins, etc.

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