A-LevelBiologyCell membranes and transportOct/Nov 2023Paper 1 Q161 Mark
Plant cells were left for 50 minutes in three different sugar solutions, 10%, 5% and 1%. The water potential in the cytoplasm of the three cells was the same at the start of the experiment. The diagrams show the appearance of the cells after 50 minutes, using a light microscope. [Figure 16.1] Which conclusion is correct?
ACell P has the same concentration of sugar inside and outside the cell.
BCell Q is flaccid and cell P is plasmolysed.
CCell Q was placed in the 1% solution.
DThe sugar solution outside cell R has a less negative water potential than inside cell R.
✓ Correct Answer
The correct answer is C: Cell Q was placed in the 1% solution.
📋 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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