May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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18Diffusion Osmosis Membrane TransportHard1 mark
Strips of plant tissue were immersed in a range of sucrose solutions of different concentrations. Their lengths were measured before immersion and after 30 minutes. The graph shows the ratio of initial length to final length.
Figure 18, a graph of the ratio of initial length to final length (y-axis, 0.4 to 1.4) against sucrose concentration in mol dm$^{-3}$ (x-axis, 0.1 to 0.8); the curve rises in an S-shape from about 0.4 at 0.1 mol dm$^{-3}$, crosses a ratio of 1.0 at roughly 0.35-0.4 mol dm$^{-3}$, and levels off at about 1.4 by 0.7-0.8 mol dm$^{-3}$.
What is a correct description of the change in the cells and in the water potential of the cells, as the sucrose concentration increases?
change in the cellschange in the water potential in the cells
Aless turgidmore negative
Bless turgidless negative
Cmore turgidless negative
Dmore turgidmore negative