A-LevelBiologyTransport in plantsOct/Nov 2010Paper 1 Q251 Mark
Water passes across leaf tissues by different routes as a result of • differences in water potential • the pull transmitted by cohesive forces between water molecules. The diagram shows three routes by which water can travel. [Figure 25.1 showing a cross section of a leaf with water movement routes 1, 2, 3] Which row correctly identifies why water passes across leaf tissues by the different routes? differences in water potential pull transmitted by cohesive forces
Aroute 1 routes 2 and 3
Broutes 1 and 3 route 2
Croute 2 routes 1 and 3
Droutes 2 and 3 route 1
✓ Correct Answer
The correct answer is D: routes 2 and 3 route 1
📋 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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