Question

Pearl is secreted around the

• A. Mantle layer
• B. Foreign particle between prismatic and nacreous layer
• C. Foreign particle between mantle and nacreous layer
• D. The shell

Answer 1

The correct option is C Foreign particle between mantle and nacreous layer

When a foreign material such as a sand grain or a 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 enclose it. This mantle epithelium starts secreting concentric layer of nacre around the foreign material. The completed structure is called pearl.