A student placed two equal-sized strips of plant tissue in different salt solutions. The strips were left for 30 minutes at the same temperature, then removed, blotted dry and reweighed. The percentage change in mass was calculated using:
percentage change in mass=change in massinitial mass×100\text{percentage change in mass} = \frac{\text{change in mass}}{\text{initial mass}} \times 100percentage change in mass=initial masschange in mass×100| Strip | Initial mass in g | Final mass in g |
|---|---|---|
| P | 2.50 | 2.20 |
| Q | 2.50 | 2.75 |
Calculate the percentage change in mass of strip P.
Explain the results shown in the table in terms of the movement of water molecules.
140 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.