Echinoderms have which type of feet?

• A. Tube feet
• B. Pincer feet
• C. Fin feet
• D. Tentacle feet

Answer: (A)

Echinoderms move with tube feet, which are small, hollow extensions connected to a water vascular system. Water pumps into these tubes to extend them, and retraction pulls them back. Each tube foot typically ends in a tiny suction cup, allowing the animal to grip surfaces, crawl along the sea floor, and handle prey or bring food toward its mouth. The other terms don’t describe echinoderm anatomy—pincer-like structures are claws found in other groups, fins belong to fish and marine mammals, and tentacles are typical of cephalopods and some cnidarians. So the characteristic feet of echinoderms are tube feet.