Role of the water vascular system in Echinoderms is :

A. Respiration and Locomotion

B. Excretion and Locomotion

C. Capture and transport of food
D. Digestion and Respiration
E.  Digestion and Excretion

Choose the correct answer from the options given below :

The water vascular system is a unique hydraulic system found in echinoderms such as starfish, sea urchins, and sea cucumbers.

Its primary functions are:

1. Locomotion: The system powers the tube feet, which extend and retract by changes in hydraulic pressure, allowing the animal to move, cling to surfaces, and manipulate objects.

2. Respiration: In many echinoderms, the tube feet and associated structures facilitate gas exchange with the surrounding water, serving a respiratory role.

3. Capture and transport of food: The tube feet can also grasp food particles and move them toward the mouth, assisting in feeding.

It does not play a major role in excretion, digestion, or any direct metabolic processing of waste products; those functions are handled by other body systems.

Therefore, the correct combination of roles is “Respiration and Locomotion” (A) and “Capture and transport of food” (C), which corresponds to the option A and C Only.