Multiple choice

The peculiar water-driven tube system is found in

  1. poriferans

  2. coelenterates

  3. echinoderms

  4. molluscs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Echinodermata - In Greek, ‘echinos’ means 'hedgehog' (skin is not smooth, but is rough with spines) and ‘derma’ means 'skin'. Thus, these are organisms with spines on the skin. These are free-living marine animals. They have peculiar water-driven tube system, which they use for moving around in water, capture and transport of food and respiration (exchange of gases). For example, starfish and sea urchins. 

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