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Strategies for Enhancement in Food Production
normal
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
Solution
(c) 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.
Standard 12
Biology
