Question

Assertion : Mg is not present in enamel of human teeth.

Reason : Mg is an essential element for biological functions of human.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option  (b) Both A and R are true but R is not correct explanation of A

Explanation:

Enamel, the hardest substance of  the body is composed of fluorine not magnesium. Magnesium is an essential element as it acts as a co-factor of many enzymes of glycolysis and a number of other metabolic reactions.