Question

Study the following and choose the correct combinations:

• A. I only
• B. I and II only
• C. I, II and III only
• D. I, II, III and IV

Hint:

Aristotle's lantern is a five-jawed structure unique to sea urchins (Class Echinoidea) used for grazing on algae.

Answer 1

The Correct Option is D

Concept: This requires matching phylum/class with a unique structural feature and a corresponding example.
Explanation: I. Nematoda (\textit{Ancylostoma}) use renette glands for osmoregulation. II. Crustacea (\textit{Palaemon}) use green glands (or antennal glands) for excretion. III. Cephalopoda (\textit{Sepia}) use an ink gland for defense. IV. Echinoidea (\textit{Echinus}) have the Aristotle's lantern, a complex chewing apparatus. All four combinations are correct.