Echinoderms | MCQs

Explanation

• Water vascular system in echinoderms used for Respiration
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• The Water Vascular system in echinoderms is also used for locomotion, food, and waste transportation.
• The water vascular system helps in respiration, as the gaseous exchange takes place on the thin wall of feet tubes.
• The system consists of a central ring canal and radial canals extending along each arm
  

Explanation

Sea cucumbers belong to the class Holothuroidea within the phylum Echinodermata.

Unlike some other echinoderms like starfish (class Asteroidea), sea cucumbers do not have arms that are sharply set off from a central disc