Multiple choice

The peculiar water driving tube system is present in

  1. Poriferans

  2. Coelenterates

  3. Echinoderms

  4. Molluscs
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C Correct answer
Explanation

Echinoderms possess a unique water vascular system (also called the ambulacral system) that operates their tube feet for locomotion, feeding, and respiration. This network of fluid-filled canals is powered by hydraulic pressure and is one of the most distinctive features of this phylum. The term 'water driving tube system' refers to this water vascular system.

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