Question

Shell of mollusca is secreted by
1.Foot
2. Mantle
3. Ctnidia
4. Placoid

Answer 1

Answer:

mantle.

In shelled molluscs, the mantle is the organ that forms the shell, and adds to the shell to increase its size and strength as the animal grows. Shell material is secreted by the ectodermic (epithelial) cells of the mantle tissue.

Answer 2

Answer:

Shell of mollusca is secreted by mantle