O-LevelBiologyRespiration5090/11 · Oct/Nov 2025 · Q181 Mark

Which statement explains the association between smoking tobacco and emphysema?

ATobacco smoke can cause mutations in lung cells.

BTobacco smoke can lead to the breakdown of alveoli.

CTobacco smoke may reduce the growth of a fetus.

DTobacco smoke reduces the amount of oxygen carried by red blood cells.

✓ Correct answer

B: Tobacco smoke can lead to the breakdown of alveoli.

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2025 Paper 1 Variant 1, question 18.

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