Pearl is a hard object produced within the soft tissues of a mollusc Which one of the following is t...........

General Science (CDS) Biology

Pearl is a hard object produced within the soft tissues of a mollusc. Which one of the following is the main constituent of pearl?

Calcium carbonate

Calcium oxide

Calcium nitrate

Calcium sulphate

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Explanation:

A pearl is a hard substance which is formed by the concentric layer of Calcium carbonate. Pearl is found inside a living shelled mollusc. Calcium carbonate is the building block of shells. Concentration of Calcium carbonate can be higher in deep sea water than the surface water. It is higher in seawater than in fresh water. Corals are highly dependent on it for the formation of rigid outer shell.