O-LevelBiologyRespiration5090/12 · May/June 2015 · Q181 Mark

The diagram shows a section of an alveolus and a capillary in a lung. [Diagram] What are the relative concentrations of carbon dioxide at X, Y and Z?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Ahigh, high, high

Bhigh, low, low

Clow, high, high

Dlow, high, low

✓ Correct answer

B: high, low, low

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2015 Paper 1 Variant 2, question 18.

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