A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2021 · Q351 Mark

The heart rate of a person at rest was recorded at intervals over two 15-minute periods. During the first five minutes of the second 15-minute period, the person smoked a cigarette. The graph shows the results recorded during the two 15-minute periods. [Graph showing heart rate /beats per min vs time/mins, with lines for 'smoking for first five minutes' and 'not smoking'] What can be concluded from the graph?

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.

ACarbon monoxide affects the heart rate.

BCarbon monoxide binds to haemoglobin increasing the flow of blood.

CNicotine increases the heart rate so is a stimulant.

DThe heart rate increases as a result of smoking.

✓ Correct answer

D: The heart rate increases as a result of smoking.

Oracle Prep sorts past-paper questions by topic, so you can drill Transport in mammals and see which topics are most likely to come up next.

Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2021 Paper 1 Variant 2, question 35.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content