Question

Which of the following pair of class and organism is not correctly matched?

• A. Polyplacophora- Chiton
• B. Gastropoda - Aplysia
• C. Monoplacophora - Chiton
• D. Aplacophora - Chaetoderma

Hint:

Chitons are strongly associated with the class Polyplacophora (poly = many, placo = plates, phora = bearing), which refers to their characteristic eight-plated shell. Seeing Chiton paired with any other class should be an immediate red flag.

Answer 1

The Correct Option is C

Step 1: Concept Overview:
This question assesses your understanding of Mollusca classification. Identify the incorrect organism-class pairing.
Step 2: Detailed Analysis:
Evaluating each option:


(A) Polyplacophora - Chiton: Correct. Chitons, characterized by eight dorsal shell plates, are defining members of Polyplacophora.

(B) Gastropoda - Aplysia: Correct. Aplysia (sea hare) is a marine gastropod. Gastropoda includes snails and slugs.

(C) Monoplacophora - Chiton: Incorrect. As noted in (A), Chiton belongs to Polyplacophora. Monoplacophora comprises deep-sea molluscs, like Neopilina, once thought extinct.

(D) Aplacophora - Chaetoderma: Correct. Aplacophora are small, shell-less, worm-like marine molluscs. Chaetoderma is a typical example.

Step 3: Conclusion:
The mismatched pair is Monoplacophora - Chiton.