A-LevelBiologyTransport in plantsMay/June 2025Paper 1 Q271 Mark

Which features of companion cells and xylem vessel elements make them suitable for their function?

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.

Acompanion cells: transport contents of cell in one direction only, xylem vessel elements: lignified walls provide support

Bcompanion cells: cellulose walls provide support, xylem vessel elements: nuclei allow cell division

Ccompanion cells: nuclei allow cell division, xylem vessel elements: gaps between cells allow rapid transport

Dcompanion cells: numerous mitochondria supply energy, xylem vessel elements: absence of cytoplasm allows mass flow

✓ Correct Answer

The correct answer is D: companion cells: numerous mitochondria supply energy, xylem vessel elements: absence of cytoplasm allows mass flow

📋 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 2025 examination, Paper 1 Variant 2.

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