Standard Science Primary 5 Systems

Compared to inhaled air, exhaled air contains __________.

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

Step 1: The body takes in oxygen for respiration. Step 2: Carbon dioxide is produced as a waste product. Step 3: Exhaled air reflects these changes: less oxygen, more CO2.

Correct answer: less oxygen and more carbon dioxide

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