O-LevelBiologyRespiration5090/11 · Oct/Nov 2015 · Q161 Mark
What is the composition of expired air?
Aoxygen 4, carbon dioxide 21, nitrogen 74, water vapour variable
Boxygen 16, carbon dioxide 4, nitrogen 78, water vapour saturated
Coxygen 16, carbon dioxide 0.04, nitrogen 78, water vapour saturated
Doxygen 21, carbon dioxide 0.04, nitrogen 78, water vapour variable
✓ Correct answer
B: oxygen 16, carbon dioxide 4, nitrogen 78, water vapour saturated
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