O-LevelBiologyRespiration5090/12 · May/June 2015 · Q251 Mark

The diagrams show the structure of the alveoli in the lungs of a normal person and in a smoker with emphysema. [Diagram] What is the effect of emphysema?

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.

Aincreased chance of lung cancer

Binflammation of the walls of the airways

Cless difficulty in breathing in and out

Dless efficient gaseous exchange

✓ Correct answer

D: less efficient gaseous exchange

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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 25.

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