A student wanted to find out the rate of transpiration using a potometer as shown. [Figure 25.1] The student was told to work out a value for transpiration using the units mm³, m⁻² and hour⁻¹. Which measurements would the student need to take?
✓ Correct Answer
The correct answer is C: distance air bubble moves, radius of the capillary tubing, time and surface area of the leaves
📋 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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