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  4. The animal with bilateral symmetry in young stage, and radial pentamerous symmetry in the adult stage belongs to the phylum

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Q. The animal with bilateral symmetry in young stage, and radial pentamerous symmetry in the adult stage belongs to the phylum

Jharkhand CECEJharkhand CECE 2009

Solution:

Echinoderms are triploblastic animals with organ system level of organization. Larval forms possess bilateral symmetry while adults have radial symmetry. Annelids are bilaterally symmetrical animals, eg, Neries, Aphrodite. Molluscans are bilaterally symmetrical animals, butsnails are asymmetrical. Cnidarians (coelenterates) are radially symmetrical animals with tissue grade of body organization.