A-LevelBiologyGas exchange9700/12 · Feb/Mar 2016 · Q331 Mark

Some of the effects of smoking are listed. 1 It causes coughing. 2 It increases blood pressure. 3 It decreases the transport of oxygen. 4 It increases the risk of cancer. 5 It prevents cilia from moving. Which components of tobacco smoke cause these effects? [Figure 33.1]

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Atar: 1, 3 and 4; carbon monoxide: 2; nicotine: 4 and 5

Btar: 1, 4 and 5; carbon monoxide: 3; nicotine: 2

Ctar: 1 and 5; carbon monoxide: 3 and 5; nicotine: 4

Dtar: 3 and 4; carbon monoxide: 1, 2 and 5; nicotine: 2 and 4

✓ Correct answer

B: tar: 1, 4 and 5; carbon monoxide: 3; nicotine: 2

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2016 Paper 1 Variant 2, question 33.

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