O-LevelBiologyRespiration5090/11 · Oct/Nov 2019 · Q181 Mark

The pie charts show the proportions of gases in samples of inspired and expired air. [Figure 18.1] Which segments represent which gases?

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Anitrogen, other gases, oxygen

Bnitrogen, oxygen, other gases

Coxygen, other gases, nitrogen

Doxygen, other gases, carbon dioxide

✓ Correct answer

B: nitrogen, oxygen, other gases

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2019 Paper 1 Variant 1, question 18.

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