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Q.

[[1]] is called the pearl's mother layer.

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answer is NACRE.

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Detailed Solution

Nacre is called the pearl's mother layer. 
The epithelial cells present in the mantle tissue of some molluscs are responsible for the secretion of nacre. There is a continuous secretion of nacre on the inner surface of the shell. Pearl formation occurs only in a few bivalves.
 

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