Pearl is secreted around the

Options

A. Mantle layer
B. Foreign particle between prismatic & nacreous layer
C. Foreign particle between the mantle & nacreous layer
D. The shell

Answer

C

Explanation

The pearl oysters produce pearl as an adaptation against outside materials. When as foreign material such as sand, grain or parasite happens to enter the body it adheres with the mantle. The mantle epithelium at once grows over the material in the form of a sac and encloses it. This mantle epithelium starts secreting concentric layers of nacre around the foreign material. The complete structure is called pearl