A) Mantle layer
B) Foreign particle between prismatic and nacreous layer
C) Foreign particle between mantle and nacreous layer
D) The shell
Correct Answer: C
Solution :
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.
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