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Discussion

Preparation for Olympiads - Grade 8
(9)

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Which components of air are present in the air exhaled by humans during breathing?

 
Only CO2
More CO2 and less O2
N2, CO2, O2 and water vapour
CO2, O2 and water vapour

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Valen

Only co2

Neha Sinha

During respiration, glucose is broken down into carbon dioxide and water vapour. So the exhaled air contains both these gases. Also, some amount of oxygen will be present in the exhaled air as oxygen is a component of air. But yes, the percentage of oxygen in exhaled air will be much lower compared to inhaled air.

Pritish Garg

Option 3 must be correct