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: Understanding the Concept:
Aristotle's Lantern is the complex and highly developed feeding apparatus found in sea urchins (Class Echinoidea). It is a conical structure located in the mouth that is used for scraping algae from rocks and for chewing.

Step 2: Detailed Explanation:
The structure of Aristotle's Lantern is based on the five-part (pentamerous) radial symmetry characteristic of echinoderms. It consists of a complex arrangement of muscles and calcareous plates that support five hard, pointed, tooth-like structures. These five "teeth" or "jaws" can be protruded from the mouth to scrape and chew food.

Step 3: Final Answer:
Aristotle's Lantern is composed of five jaws. Therefore, the correct option is (B).