Question

Assertion (A): Ambulacral system plays an important role in the movement of echinoderms.

Reason (R): Hydraulic pressure of fluid and contraction of the muscles in the tube feet result in the movement of echinoderms.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A and R are false

Answer 1

The correct option is A Both A and R are true and R is the correct explanation of A

• Water vascular system is a unique feature of echinoderms. It helps in locomotion and in various other functions like respiration and food transport. It also helps to capture food.
• Ambulacral canal is connected to the outside by the tube feet. Hydraulic pressure and contraction of muscles in the tube feet help the starfish to move.