Based on the three statements given below, choose the CORRECT option.
Statement I: Echinoids have water vascular system.
Statement II: Delthyrium and pedicle foramen are found in the brachial valve of brachiopods.
Statement III: Cardinal teeth, adductor muscles and chondrophore are found in bivalves.
Statement II: Delthyrium and pedicle foramen are found in the brachial valve of brachiopods.
Statement III: Cardinal teeth, adductor muscles and chondrophore are found in bivalves.
Show Hint
- Statements I and III are correct, statement II is incorrect.
- Statements II and III are correct, statement I is incorrect.
- Statements I and II are correct, statement III is incorrect.
- Statements I, II and III are correct.
The Correct Option is A
Solution and Explanation
Step 1: Check Statement I.
Echinoids (sea urchins, echinoderms) possess a water vascular system with tube feet, used in locomotion and respiration.
Hence, Statement I is correct.
Step 2: Check Statement II.
In brachiopods, the delthyrium (a triangular opening) and pedicle foramen are structures in the pedicle valve, not the brachial valve.
Hence, Statement II is incorrect.
Step 3: Check Statement III.
Bivalves are characterized by:
- Cardinal teeth (hinge mechanism),
- Adductor muscles (close shells),
- Chondrophore (internal support for ligament in some bivalves, e.g., Mactridae).
Thus, Statement III is correct.
Step 4: Combine results.
Only Statements I and III are correct; Statement II is incorrect.
Final Answer:
\[
\boxed{\text{(A) Statements I and III are correct, statement II is incorrect.}}
\]
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