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Question

Which among the following phyla has adults exhibiting radial symmetry while the larvae exhibits bilateral symmetry?
 


A
 Annelida
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B
Arthropoda
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C
Mollusca
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D
Echinodermata
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Solution

The correct option is C Echinodermata
Annelida and Arthropoda show bilateral symmetry in larval as well as adult stages.

Organisms belonging to the phylum Mollusca show bilateral symmetry in larval and adult stages except for the class Gastropoda, where adults become asymmetrical due to torsion.

In phylum Echinodermata, the larval stage is bilaterally symmetrical whereas adults are radially symmetrical.

Biology

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