A-LevelBiologyTransport in plants9700/12 · May/June 2011 · Q301 Mark

The graph shows the results of measuring the concentration of sucrose in the xylem, phloem and leaves of a plant during 24 hours. [Figure: Graph showing sucrose concentration vs time of day, with curves for phloem, leaves, and xylem] Which conclusion can be drawn from these results?

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AOsmosis moves water from the xylem to the phloem.

BSucrose is actively transported into the phloem from the leaves.

CSucrose is moved in both directions in the phloem.

DXylem tissue uses sucrose as a source of energy.

✓ Correct answer

B: Sucrose is actively transported into the phloem from the leaves.

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 30.

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