Standard Science Primary 5 Systems

Which of the following statements about inhaled and exhaled air is correct?

A Inhaled air contains no nitrogen.
B Exhaled air contains more carbon dioxide than inhaled air.
C Exhaled air contains more oxygen than inhaled air.
D Inhaled air contains no carbon dioxide.
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Worked Solution

Step 1: During respiration, cells use oxygen and produce carbon dioxide. Step [2-9]: This carbon dioxide is transported to the lungs and breathed out. Step [2-9]: Therefore, exhaled air has a higher concentration of CO2 than inhaled air.

Correct answer: Exhaled air contains more carbon dioxide than inhaled air.

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