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CMC Medical CMC-Medical Ludhiana Solved Paper-2009

  • question_answer
    The animal with bilateral symmetry in young stage, and radial pentamerous symmertry the adult stage belongs to the phylum

    A)  Annelida                            

    B)  Mollusca

    C)  Cnidaria                              

    D)  Echinodermata

    Correct Answer: D

    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, e.g., Neries, Aphrodite. Molluscans are bilaterally symmetrical animals, but snails are asymmetrical. Cnidarians (coelenterates) are radially symmetrical animals with tissue grade of body organization.


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