| (i) Carbon dioxide | (ii) Oxygen |
| (iii) Water vapour | (iv) Nitrogen |
A) (i) only
B) (i) and (iii) only
C) (ii) and (iv) only
D) (i), (ii), (iii) and (iv)
Correct Answer: B
Solution :
Carbon dioxide is present in a higher percentage in exhaled air (4.4%) than in inhaled air (0.03%). This is because \[C{{O}_{2}}\], is formed during oxidation of food in the cells. This \[C{{O}_{2}}\], is then sent out of the body in the exhaled air. The exhaled air is saturated with water vapours.
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