Q7 / 200 · NEET 2009 (Screening) · Botany

Which one of the following groups of animals is bilaterally symmetrical and triploblastic?

  • A
    Coelenterates (cnidarians)
  • Correct answer
    B
    Aschelminthes (roundworms)
  • C
    Ctenophores
  • D
    Sponges

Solution

Aschelminthes are bilateral symmetrical and triploblastic animals, eg, Ascaris. Coelenterates are radially symmetrical and diploblastic animals, eg, Obelia. Ctenophores are biradial symmetrical and diploblastic animals, eg, Ctenoplana. Sponges are asymetrical or radially symmetrical and diploblastic animals, eg, Sycon.

Hence, the correct answer is option: 'B'.

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