Following are the properties of four minerals P, Q, R, S. Identify them and select the correct option regarding them.

P: It is required for proper functioning of thyroid gland.
Q: It helps in maintaining body's water balance.
R: It is important for haemoglobin formation.
S: It strengthens bones, teeth and helps in blood clotting.

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Solution

P is iodine, Q is sodium, R is iron, S is calcium.

Deficiency of iodine (P) causes goitre and it results in swelling of the thyroid gland that causes a lump in the front of the neck.

Sodium (Q) maintains the water balance of the body and is required for the proper functioning of the nervous system.

Deficiency of iron (R) causes anaemia.

Calcium (S) does not help in fighting against infection.

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