A student placed a sample of courgette tissue in distilled water. Distilled water contains no dissolved solute.
| Mass of sample before being placed in distilled water in g | Mass of sample after being placed in distilled water in g |
|---|---|
| 4.80 | 5.16 |
The student then transferred the sample to a salt solution. The salt solution had a higher solute concentration than the contents of the courgette cells.
Calculate the percentage increase in the mass of the sample in distilled water.
Explain why the mass of the sample changed in distilled water. Explain what would happen to the mass of the sample after it was transferred to the salt solution.
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.