A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2023 · 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?

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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

C: Cell Q was placed in the 1% solution.

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2023 Paper 1 Variant 2, question 16.

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