Standard Science Primary 5 Systems

Which of the following describes the difference between inhaled air and exhaled air?

A Exhaled air contains more oxygen than inhaled air.
B Exhaled air contains no oxygen at all.
C Inhaled air contains no nitrogen.
D Exhaled air contains more carbon dioxide and water vapour than inhaled air.
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Worked Solution

Step 1: Oxygen is absorbed into the blood during inhalation. Step 2: Carbon dioxide and water vapour are waste products produced by the body. Step 3: These waste products are removed during exhalation.

Correct answer: Exhaled air contains more carbon dioxide and water vapour than inhaled air.

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