Foundation Science Primary 5 Systems

Which of the following gases is present in a higher percentage in exhaled air compared to inhaled air?

A Nitrogen
B Carbon Dioxide
C Oxygen
D Water vapour only
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Worked Solution

Step 1: Cells use oxygen for respiration and produce carbon dioxide as waste. Step [2-9]: This waste is brought to the lungs to be removed. Step [2-9]: Thus, exhaled air has more carbon dioxide.

Correct answer: Carbon Dioxide

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