A-LevelBiologyTransport in plantsOct/Nov 2018Paper 5 Q115 Marks
Transpiration in plants can be investigated using a potometer, which measures water uptake by plants. Fig. 1.1 shows a potometer that was used by a student. [Figure 1.1] As water is lost by the leaves through transpiration, the air bubble moves along the graduated tube. The student used this apparatus to investigate the effect of light intensity on the rate of transpiration in plants.
📋 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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