A student uses an apparatus containing three chambers arranged in the order A, B and C. Membrane 1 separates chambers A and B. Membrane 2 separates chambers B and C. Both membranes are partially permeable and allow water molecules, but not sucrose molecules, to pass through.
| Chamber | Concentration of sucrose solution in mol/dm³ |
|---|---|
| A | 0.10 |
| B | 0.40 |
| C | 0.70 |
At the start of the investigation, explain the direction in which water moves across membrane 1 and across membrane 2.
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.