A-LevelBiologyGas exchange9700/12 · Oct/Nov 2020 · Q341 Mark

Which can be directly linked to a reduction in the surface area available for gas exchange in human lungs? 1 emphysema 2 lung cancer 3 smoking tobacco

A1, 2 and 3

B1 and 2 only

C1 and 3 only

D2 and 3 only

✓ Correct answer

B: 1 and 2 only

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2020 Paper 1 Variant 2, question 34.

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