Question

Which is the function of oxygen present in air ?
(a) Respiration (b) Burning of fuels
(c) Fermentation (d) All of these

Answer 1

Answer:

all of these is correct

Answer 2

(d) All of these

Explanation:

The process of respiration involves breathing in oxygen and breathing out carbon dioxide by most animals. Oxygen is required for burning. If oxygen supply is cut off, the fire will be extinguished. Fermentation is an anaerobic process. But in case of fermentation of beer, it requires air at the beginning. Later, oxygen from the sugar molecule is used. So all of the above would be the right answer.

Option D is the answer.