Standard Science Primary 5 Systems

Which of the following correctly describes the air we breathe OUT compared to the air we breathe IN?

A Less oxygen, more carbon dioxide, more water vapour
B More oxygen, less carbon dioxide, less water vapour
C More oxygen, more carbon dioxide, more water vapour
D Less oxygen, less carbon dioxide, less water vapour
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Worked Solution

Step 1: The body takes in oxygen for respiration. Step 2: The body produces carbon dioxide and water vapour as waste products. Step 3: Exhaled air reflects these changes.

Correct answer: Less oxygen, more carbon dioxide, more water vapour

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