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?
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. This question tests the candidate's understanding of transport in plants within the Biologysyllabus. The examiner's mark scheme requires...
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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...
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