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Question

Closed blood vascular system and chitinous setae or parapodia are the characteristics of

A
Arthropoda
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B
Nematoda
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C
Annelida
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D
Porifera
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Solution

The correct option is C Annelida
  • Annelids are cylindrical worms with segmented bodies.
  • The circulatory system is closed, i.e., blood flows within the blood vessels.
  • Most annelids possess setae (earthworm) or parapodia (in aquatic annelids) composed of chitin that helps in movement.
  • Aschelminthes (roundworms) and poriferans have no circulatory or respiratory systems so they use diffusion to breathe and for the circulation of substances around their body.
  • Arthropods have an open circulatory system.

So the correct answer is option C.

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