Where does pearls are formed? (UPSC Prelims 1982)

Q. Where does pearls are formed? (UPSC Prelims 1982)
Answer: Inside oysters
Notes: Natural Pearls are formed when an irritant usually a parasite works its way into an oyster, mussel, or clam. As a defense mechanism, a fluid is used to coat the irritant. Layer upon layer of this coating, called nacre, is deposited until a lustrous pearl is formed.

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