Pearl is secreted around the

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(C) When a foreign material such as a sand grain or a parasite enters the body,it adheres to the mantle.The mantle epithelium immediately grows over t

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Foreign particle between mantle and nacreous layer

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(C) When a foreign material such as a sand grain or a parasite enters the body,it adheres to the mantle.The mantle epithelium immediately 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 completed structure is called a pearl.

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