A student is revising Animal Diversity-I: a specimen has thick arms that merge gradually with a central disc and uses tube feet for movement. What should the student write in the answer sheet?

Correct Answer: B

sea stars

Sea stars belong to class Asteroidea. They have arms that are not sharply separated from the central disc and are common representatives of echinoderms. This MCQ belongs to the Asteroidea topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.