An experiment was carried out to investigate the effect of concentration of sucrose solution on cells in a plant tissue. A sample of plant tissue was cut into seven cylinders of equal length and diameter. The mass of each cylinder was recorded. Each of the seven cylinders was put into a different sucrose solution concentration. [Figure 19.1] After two hours, the cylinders were removed, blotted dry and reweighed. The percentage change in mass of each cylinder was recorded. The graph shows the results of this investigation. [Figure 19.2] Which row explains the results if plant tissue cells were put in a sucrose solution of 0.45 mol dm⁻³?
✓ Correct Answer
The correct answer is A: water potential of the cytoplasm of the cells at the start of the experiment compared with the water potential of 0.45 mol dm⁻³ sucrose solution: less negative; change in volume of the vacuoles of the cells at the end of the experiment, that were initially placed in 0.45 mol dm⁻³ sucrose solution: decreased
📋 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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