Is a pearl body part in clam?

No, a pearl is not a body part in a clam. Pearls are formed when an irritant, such as a piece of sand or grit, gets inside the shell of a mollusk. The mollusk then secretes layers of nacre, or mother-of-pearl, around the irritant to protect itself. Over time, the nacre builds up and forms a pearl. Pearls are not essential for the survival of mollusks, and they do not serve any biological function. However, they are highly valued by humans for their beauty and rarity.