Question

How does peral formation take place in oyster?

Answer 1

Yes it takes place in cleaning of clothes. 
It also forms in our body for the absorption of some fats and lipids by the small intestine.
 

Answer 2

hey friend here is Ur answer.
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 The pearl producing bivalves are marine oysters of the genus Pinctada, though some freshwater bivalves of the genus Unio and Anodonta also produce pearl but of inferior quality and rarely of any use.
Today, Japan produces the bulk of pearl in the world by using pearl culture technique. However, the culture of pearl, its fishing and its commercialisation, etc., constitute a separate story.

The pearl is secreted by the mantle as a protective measure against foreign objects like sand particles, parasites, small larvae or any object of organic and inorganic origin.

In fact, as soon as a foreign object, somehow, enters the body of a bivalve in between the shell and mantle, the mantle immediately gets irritated and at once encloses it like a sac. The mantle wall then starts secreting layers of nacre around the foreign object from defence point of view.

Thus, mantle wall secretes continuously several layers of nacre around the foreign object and finally pearl is formed. The value of pearl depends upon its size, quality, etc. Now a days, the pearl producing bivalves are reared and pearls are produced artificially by introducing some foreign objects between the mantle and shell in the different parts of the world; Japan has surpassed all other countries in this field.

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