Standard Science Primary 5 Systems

Compared to inhaled air, exhaled air contains __________.

A more oxygen and less carbon dioxide
B less oxygen and more carbon dioxide
C the same amount of nitrogen and more oxygen
D less water vapour and more nitrogen
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Worked Solution

Step 1: Oxygen is taken into the blood for energy production. Step 2: Carbon dioxide is a waste product released into the lungs. Step 3: Therefore, exhaled air has less oxygen and more CO2.

Correct answer: less oxygen and more carbon dioxide

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