Standard Science Primary 5 Systems

Compared to inhaled air, exhaled air contains __________.

A more oxygen and less water vapour
B less oxygen and more carbon dioxide
C more nitrogen and less oxygen
D less carbon dioxide and more oxygen
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Worked Solution

Step 1: Body cells take in oxygen for energy. Step 2: Respiration produces carbon dioxide and water vapour as waste products. Step 3: Therefore, exhaled air has less oxygen and more CO2/water vapour.

Correct answer: less oxygen and more carbon dioxide

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