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Q.

Prized for their luminous beauty, pearls are often crafted into exquisite jewellery. These gems of the sea are obtained from

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a

Pila

b

Pinctada

c

Sepia

d

Aplysia

answer is D.

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Detailed Solution

Pinctada is the pearl oyster. When a tiny grain of sand or some other irritant enters between the oyster's shell and its soft mantle, the mantle gets irritated. To protect itself, the mantle secretes a pearly substance (nacre) around the irritant forming a pearl.

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