Question

(c) A student conducted an experiment to investigate the percentage change in mass of potato tuber tissue when placed in different concentrations of sucrose solution. The potato tuber tissue cut into cubes of the same size. Fig. 4.2 shows a graph of the results. 40 30 20 10 percentage change 0 in mass 0.0 -10 0.2 0.4 0.6 1 0.8 1.0 -20 -30 -40 concentration of sucrose solution/moldm3 (i) Use Fig.4.2 to predict the percentage change in mass of a cube of potato tuber tissue plac mol dm-3 sucrose solution. (ii) Explain the results shown in Fig. 4.2 in terms of water potential: • between sucrose concentrations of 0.0 -0.4 mol dm-3 • at sucrose concentration 0.4 mol dm-3 between sucrose concentrations of 0.4 - 1.0 mol dm-3. Between 0.0 -0.4 mol dm-3 AL04 mol dm-3​

Answer 1

(a) (0.15 / 1.35) × 100

1

1

11.1 (%)

allow 11.1 (%) with no working shown for 2 marks

1

(b) to allow results to be compared

or

they had different masses at the start

1

(c) axis correct scale and labelled

1

5 points correctly plotted

allow ecf from 05.1

allow 1 mark for 4 points correctly plotted

2

line of best fit

1

(d) 0.5

allow 0.45–0.55

1

(e) (0.0 to 0.4) water moves into cells

1

(0.6 to 0.8) water leaves cells

1

by osmosis

1

(f) any two from:

• concentration of solutions

• drying of chips

• accuracy of balance

• evaporation from tubes

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