O-LevelBiologyRespiration5090/11 · Oct/Nov 2011 · Q181 Mark

The table shows the composition of inspired and expired air. What are the likely percentages at X and Y?

A0.04, 83.96

B4.04, 79.96

C20.04, 63.96

D83.96, 0.04

✓ Correct answer

B: 4.04, 79.96

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2011 Paper 1 Variant 1, question 18.

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