Standard Science Primary 5 Systems

Which of the following gases is found in a HIGHER percentage in exhaled air compared to inhaled air?

A Oxygen
B Nitrogen
C Carbon Dioxide
D Water Vapour
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Worked Solution

Step 1: During respiration, oxygen is consumed and carbon dioxide is produced as a waste product. Step [2-9]: This waste carbon dioxide is transported to the lungs and exhaled. Step [2-9]: Therefore, exhaled air contains significantly more carbon dioxide than the surrounding air.

Correct answer: Carbon Dioxide

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