Question

Rakesh went for mountain climbing. As he climbed higher, he began to feel difficulty in breathing
following dizziness and lack of muscular co-ordination. Later, he had to be carried down. What caused this?
(A) Absence of oxygen
(B) Decrease in oxygen content
(C) Decrease in nitrogen content
(D) None of these

Answer 1

The answer is B ( Decrease in oxygen content )

Answer 2

decrease in oxygen content because as you higher in altitude , air quantity become low