IB Biology SL 2.4.4 Osmosis experiments with plant tissue Question Bank

a. calculate percentage difference in mass;

b. plot (percentage change) mass against concentration;

c. concentration of solutes in potato tissues corresponds to 0 / zero / no mass change OR

where the line (of best fit) crosses the mass change at zero is the potato tissue concentration;

Marking guidance:

Accept the correct calculation for percentage (final mass - initial, divided by initial and times 100).

Accept annotated graph.

2 max

Any number from $0.31 \mathrm{~mol} \mathrm{dm}^{-3}$ to $0.39 \mathrm{~mol} \mathrm{dm}^{-3}$;

Units required.