Question

Which among the following is incorrect about water vascular system in Echinoderms?

(a) Water driven tube feet system helps in locomotion as well as in excretion

(b) Water vascular system has a ring canal which fills initially followed by that of radial canals

(c) Echinoderms excrete waste by osmosis in the tube feet

(d) Exchange of gases takes place due to water vascular system

The question was posed to me during an online interview.

Question is from Classification of Animal Kingdom into Different Phylum-4 topic in division Animal Kingdom of Biology – Class 11

Answer 1

Right choice is (c) Echinoderms excrete waste by osmosis in the tube feet

To elaborate: Water driven tube feet system helps in locomotion as well as in excretion. Water vascular system has a ring canal which fills initially followed by that of radial canals. Echinoderms excrete waste by diffusion through the tube feet. Exchange of gases takes place due to water vascular system.