A-LevelBiologyTransport in plantsMay/June 2021Paper 1 Q231 Mark
Which descriptions of the adaptations of xylem vessel elements to their function are correct? 1 They have pits between vessels allowing water to pass from one vessel to another. 2 They are thickened with lignin to stop them collapsing when the column of water is under tension. 3 They form a continuous hollow tube through the plant providing little resistance to water movement.
A1, 2 and 3
B1 and 3 only
C2 only
D2 and 3 only
✓ Correct Answer
The correct answer is A: 1, 2 and 3
📋 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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