O-LevelBiologyRespiration5090/11 · Oct/Nov 2016 · Q171 Mark

What is the approximate composition of inspired air?

ACO₂: 0.04%, O₂: 16%, N₂: 78%, water vapour: saturated

BCO₂: 0.04%, O₂: 21%, N₂: 78%, water vapour: variable

CCO₂: 4%, O₂: 16%, N₂: 78%, water vapour: saturated

DCO₂: 4%, O₂: 21%, N₂: 78%, water vapour: variable

✓ Correct answer

B: CO₂: 0.04%, O₂: 21%, N₂: 78%, water vapour: variable

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2016 Paper 1 Variant 1, question 17.

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