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.