A-LevelBiologyTransport in plantsOct/Nov 2011Paper 1 Q301 Mark
Which evidence supports the theory of water movement by root pressure in flowering plants? 1 When the rate of transpiration of a tree is maximum, the diameter of the trunk is minimum. 2 When a plant shoot is removed close to the base of the stem, sap leaks out from the cut. 3 Evaporation of water from a porous pot can exert a force that draws water up a glass tube attached underneath the pot. 4 Droplets of water form at the edge of leaves of plants growing in conditions of soil with high water content and air with high humidity.
A1 and 2
B1 and 3
C2 and 3
D2 and 4
✓ Correct Answer
The correct answer is D: 2 and 4
📋 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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