Which component of air is necessary for humans to get energy from food?

Nitrogen

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Oxygen

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Water vapour

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Carbon dioxide

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Solution

The correct option is B
Oxygen

Oxygen is the necessary gas to derive energy from food. The human body cells use the oxygen inhaled during respiration to get energy from the food that is consumed. This process is called cellular respiration. During cellular respiration, the cells use oxygen to break down sugar. Breaking down sugar produces the energy that the body needs.

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