Answer :

(a) Calcium is a macronutrient and is required in large amounts by our body. There are various bodily functions which are controlled by calcium.


Function- It plays important role in muscle contraction.


(b) Sodium is a macronutrient and is required in large amounts by our body. There are various bodily functions which are controlled by sodium.


Function- It is involved in the transmission of impulses through nerve cells.


(c) Iron is a micronutrient and is required in trace amounts.


Function: It is an important component of haemoglobin and is required for its formation.


(d) Iodine is a micronutrient and is required in trace amounts.


Function: It is required by thyroid gland for synthesis of its hormones.


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