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Question

In which of these following phyla given as the adult shows radial symmetry, the larva shows bilateral symmetry?

A
Annelids
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B
Arthropods
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C
Molluscs
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D
Echinodermata
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Solution

The correct option is B Echinodermata
  • Echinodermata has radial symmetry as the have a triploblastic body structure which includes a central canal and five arms which help in locomotion.
  • The larvae of echinoderms have bilateral symmetry but this is lost during metamorphosis.
  • During the metamorphosis, their bodies are reorganized and develop the character of radial symmetry of the echinoderm, typically pentamers. So, the correct answer is option D.

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