Question

Statement I: Crystalline style present in stomach of pelecypods help in digestion of starches.
Statement II: Larva of sea cucumbers is auricularia.

• A. Both statements I and II are correct
• B. Both statements I and II are false
• C. Statement I is true. But II is false
• D. Statement I is false. But II is true

Hint:

The crystalline style is an interesting adaptation for digestion found in bivalves and can vary in its presence and function among different species. Understanding the larval stages of marine invertebrates like sea cucumbers can provide insights into their development and survival strategies.

Answer 1

The Correct Option is A

Step 1: Verifying the function of the crystalline style. The crystalline style is an enzyme-secreting rod found in the stomachs of some mollusks, particularly pelecypods (bivalves). It rotates and releases enzymes to aid in the mechanical and enzymatic digestion of food, including the breakdown of starches, making the first statement correct. 
Step 2: Understanding sea cucumber larvae. The larva of sea cucumbers is indeed called auricularia, which is a stage in their development that resembles a small auricle or ear, helping in their planktonic (free-swimming) lifestyle before they settle down and metamorphose into the adult form, confirming the second statement as correct.

Answer 2

To solve the problem, we need to verify the two given statements about biological processes and organisms.

1. Statement I: Crystalline style present in stomach of pelecypods help in digestion of starches:
This statement is correct. Crystalline style is an organ found in the stomach of pelecypods (mollusks) and plays a significant role in the digestion of starches by secreting enzymes that help in the breakdown of carbohydrates.

2. Statement II: Larva of sea cucumbers is auricularia:
This statement is also correct. The larvae of sea cucumbers are indeed called "auricularia," and they are characteristic of this group of echinoderms.

3. Analyzing the Correctness:
Both statements I and II are correct, as both the function of the crystalline style in pelecypods and the identity of the sea cucumber larva as auricularia are accurate.

Final Answer:
The correct answer is Option A: Both the statements I and II are correct.