A-LevelBiologyTransport in plantsMay/June 2011Paper 1 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?

Q: What topic does this question test?

This question tests Transport in plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

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

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

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Biology Question

Topic

This multiple-choice question tests Transport in plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2011 examination, Paper 1 Variant 2.

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