Question

Characteristic feature of members of phylum Echinodermata is

• A. Schizocoel
• B. Water vascular system
• C. Metamerism
• D. Bilateral symmetry

Answer 1

The correct option is B Water vascular system

• The water vascular system is a hydraulic system used by echinoderms like sea stars and sea urchins.
• It is used for locomotion, food and waste transportation, and respiration.
• The system is composed of canals connecting many tube feet.
• They move by alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, then relaxing to allow the feet to retract.

Hence, option B is correct.