Question

A ciliary organ present in the gills of bivalvia of Mollusca helps in which of the following function?

• A. Respiration
• B. Excretion
• C. Both A and B
• D. Smelling

Answer 1

Answer: (C)

Both A and B

A ciliary organ present in the gills of Bivalvia of Mollusca helps in respiration and excretion. The food, collected by tentacles, is then transported to the mouth in a ciliated groove. Digestible particles are collected and transported to the mouth opening.

The tentacles are covered in mucus, which traps the food, and cilia, which transport the particles back to the palps. These then sort the particles, rejecting those that are unsuitable or too large to digest, and conveying others to the mouth. so, the correct answer is option C.