Question

Match the bivalves in Group I with their modes of life in Group II. 

 

• A. P-4, Q-3, R-2, S-1
• B. P-4, Q-3, R-4, S-2
• C. P-3, Q-2, R-4, S-1
• D. P-1, Q-4, R-3, S-2

Hint:

To classify bivalves, remember the key modes of life: burrowing, swimming, byssate attachment, and free-lying.

Answer 1

The Correct Option is C

Step 1: Understanding the Modes of Life of Bivalves.
- Gryphaea is a genus of oyster, which attaches to substrates and is sessile byssate (P-4).
- Mya is a genus of clam that burrows into the sediment (Q-3).
- Mytilus is a genus of mussels that attaches to surfaces by byssal threads, typically free-lying (R-2).
- Pecten is a genus of scallops that can swim (S-1).
Step 2: Analyzing the options.
(A) P-4, Q-3, R-2, S-1: Correct — This matches each bivalve with its corresponding mode of life.
(B) P-4, Q-3, R-4, S-2: Incorrect — The mode of life for Mytilus is incorrect.
(C) P-3, Q-2, R-4, S-1: Incorrect — The matches for Gryphaea and Mya are incorrect.
(D) P-1, Q-4, R-3, S-2: Incorrect — The modes of life for all bivalves are incorrect.
Step 3: Conclusion.
The correct answer is (A) P-4, Q-3, R-2, S-1, as it accurately matches each bivalve with its mode of life.