A-LevelBiologyTransport in plants9700/12 · May/June 2025 · Q291 Mark

The graph shows the diameter of a tree trunk at different times. [Figure 29.1 (graph of diameter of tree trunk vs time of day, with points J, K, L)] Which statement is correct?

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.

AJ shows the expansion of the trunk as water fills the xylem during transpiration.

BK shows a reduction in diameter of the trunk as water is lost from the phloem due to translocation.

CK shows a reduction in diameter of the trunk due to water held in tension in the xylem.

DL shows the expansion of the trunk as the phloem tissue acts as a sink at night.

✓ Correct answer

C: K shows a reduction in diameter of the trunk due to water held in tension in the xylem.

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

Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2025 Paper 1 Variant 2, question 29.

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