A-LevelBiologyTransport in plantsOct/Nov 2017Paper 1 Q271 Mark
The diagram shows a xerophytic leaf in different conditions, P and Q. [Figure 27.1 - diagrams of xerophytic leaves in conditions P and Q] Which statements about the cells in layer X of the leaf in each of the conditions P and Q are correct? 1 less negative water potential in P than Q, 2 cells may be turgid in P and plasmolysed in Q, 3 cells less turgid in P than Q, 4 no net diffusion of water into X in either P or Q
A1, 2, 3 and 4
B1, 2 and 4 only
C1 and 4 only
D2 and 3 only
✓ Correct Answer
The correct answer is B: 1, 2 and 4 only
📋 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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