Standard Science Primary 5 Systems

Based on the table comparing inhaled and exhaled air, which pair of readings accurately represents exhaled air?

A Less oxygen, more carbon dioxide
B No oxygen, only carbon dioxide
C Same amount of oxygen and carbon dioxide
D More oxygen, less carbon dioxide
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Worked Solution

Step 1: The body uses oxygen for respiration, so exhaled air has less oxygen than inhaled air. Step 2: Respiration produces carbon dioxide as waste. Step 3: Therefore, exhaled air has more carbon dioxide.

Correct answer: Less oxygen, more carbon dioxide

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