(a)[3]
With reference to Fig. 3.2, describe how increasing the concentration of sucrose solution affects the mass of the potato cylinders.
(b)[3]
Explain why the mass of the potato cylinders changed in $0.6\,\text{mol dm}^{-3}$ sucrose solution.
Biology 9700 · AS & A Level · Transport mechanisms
Transport mechanisms — practice question
A student conducted an experiment to find out how increasing the concentration of sucrose solution affected the mass of potato tissue. Potato tissue was cut into cylinders of identical length and diameter. The mass of each cylinder was measured. Each cylinder was placed in a sucrose solution, as shown in Fig. 3.1. After one hour, each cylinder was taken out, blotted dry and weighed again. The percentage change in mass of each cylinder was then worked out. The experiment was carried out three times. The mean percentage change in mass of the potato cylinders in each sucrose solution was calculated. Fig. 3.2 shows the outcomes of this investigation.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Between $0$ and $0.2\,\mathrm{mol\,dm^{-3}}$ the potato mass rises” …
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