Biology · Oct / Nov 2019 · Paper 12 · Question 3

Discs of raw potato tissue are weighed (initial mass). They are then placed in sucrose solutions of different concentrations. After one hour their masses are measured again (final mass). The graph shows how the ratio of initial mass : final mass changes with concentration of sucrose solution. Which concentration of sucrose solution has the same water potential as that of the cells in the potato discs?

1. A0.1 mol per dm3
2. B0.3 mol per dm3
3. C0.4 mol per dm3
4. D0.5 mol per dm3

As printed in the paper