Question

How many jaws are present in Aristotle's Lantern?

• A. 3
• B. 5
• C. 6
• D. 4

Hint:

Echinoderms (like sea stars, brittle stars, and sea urchins) are famous for their five-part radial symmetry. If you see a question about the number of parts in an echinoderm structure, 5 is a very common answer. In this case, the 5 jaws of Aristotle's Lantern reflect this fundamental body plan.

Answer 1

The Correct Option is B

Step 1: Concept Overview:
Aristotle's Lantern is a sophisticated feeding structure found in sea urchins (Echinoidea class). This cone-shaped apparatus, located within the mouth, enables the urchin to scrape algae from surfaces and process food.

Step 2: Structure Breakdown:
Aristotle's Lantern exhibits the five-part radial symmetry typical of echinoderms. Its intricate design includes muscles and calcareous plates supporting five rigid, pointed, tooth-like components. These five "teeth" or "jaws" extend from the mouth for scraping and chewing.

Step 3: Conclusion:
Aristotle's Lantern features five jaws. Hence, option (B) is correct.