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: Understanding the Concept:
This question tests knowledge of the classification within the phylum Mollusca. We need to identify the pair where the example organism does not belong to the specified class.
Step 2: Detailed Explanation:
Let's check each pair:


(A) Polyplacophora - Chiton: This is a correct match. Chitons are the defining members of the class Polyplacophora, characterized by their shells made of eight dorsal plates.

(B) Gastropoda - Aplysia: This is a correct match. Aplysia, commonly known as the sea hare, is a marine gastropod mollusc. The class Gastropoda includes snails and slugs.

(C) Monoplacophora - Chiton: This is an incorrect match. As established in (A), Chiton belongs to the class Polyplacophora. The class Monoplacophora consists of deep-sea molluscs that were once thought to be extinct; a classic example is Neopilina.

(D) Aplacophora - Chaetoderma: This is a correct match. The class Aplacophora includes small, worm-like marine molluscs that lack a shell. Chaetoderma is a representative genus.

Step 3: Final Answer:
The pair that is not correctly matched is Monoplacophora - Chiton.