A-LevelBiologyTransport in plantsMay/June 2024Paper 1 Q271 Mark

Which statement helps to explain why water molecules are forced to move through xylem vessel elements as a consequence of transpiration?

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.

AWater molecules form hydrogen bonds with cellulose in the walls of xylem vessel elements in a process known as adhesion.

BWater molecules form hydrogen bonds with neighbouring water molecules in a process known as cohesion.

CWater molecules form ionic bonds with dissolved mineral ions, which helps to keep the water molecules together in a continuous column.

DWater has a high latent heat of vaporisation and this prevents the evaporation of water in the xylem vessel elements.

✓ Correct Answer

The correct answer is B: Water molecules form hydrogen bonds with neighbouring water molecules in a process known as cohesion.

📋 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 2024 examination, Paper 1 Variant 2.

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