A-LevelBiologyTransport in plants9700/12 · May/June 2016 · Q231 Mark

The graph shows the diameter of a tree trunk at different times. [Figure 23.1] Which statement is correct?

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

BY shows a reduction in diameter of trunk as water is lost from the xylem due to transpiration.

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

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

✓ Correct answer

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

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2016 Paper 1 Variant 2, question 23.

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