Standard Science Primary 5 Systems

Which of the following correctly describes the change in the amount of nitrogen in the air we breathe in compared to the air we breathe out?

A The amount of nitrogen inhaled is less than exhaled.
B The amount of nitrogen inhaled is more than exhaled.
C The amount of nitrogen remains the same.
D Nitrogen is not found in exhaled air.
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Worked Solution

Step 1: Identify that nitrogen is an inert gas in the context of human respiration. Step [2-9]: The body does not absorb or produce nitrogen during gas exchange. Step [2-9]: Therefore, the percentage of nitrogen inhaled is the same as the percentage exhaled.

Correct answer: The amount of nitrogen remains the same.

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