Question : Which among the following is the primary constituent of pearls?
Option 1: Calcium sulphate
Option 2: Calcium carbonate
Option 3: Sodium bicarbonate
Option 4: Magnesium peroxide
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Correct Answer: Calcium carbonate
Solution : The correct answer is Calcium carbonate.
The primary constituent of pearls is calcium carbonate. Pearls are formed within the soft tissue of a living shelled mollusc, such as an oyster or mussel, as a defence mechanism against irritants. The mollusc secretes layers of nacre (mother-of-pearl), primarily composed of calcium carbonate, around the irritant, resulting in the formation of a pearl.
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Question : Which of the following chemicals is used as rodenticide?
Option 1: Copper sulphate
Option 2: Zinc sulphide
Option 3: Iron sulphate
Option 4: None of these
Question : Goitre is caused due to the deficiency of_______.
Option 1: iodine
Option 2: sodium
Option 3: iron
Option 4: calcium
Question : What is the common name for calcium magnesium silicate?
Option 1: Slaked lime
Option 2: Milk of magnesia
Option 3: Asbestos
Option 4: Plaster of Paris
Question : What is the main constituent of the human bone?
Option 1: Phosphorus
Option 2: Calcium
Option 3: Zinc
Option 4: Iron
Question : Magnesium is present in which of the following?
Option 1: Chlorophyll
Option 2: Haemoglobin
Option 3: Cytochrome
Option 4: ATP
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