A pollen grain is kept in a storage solution. The cell membrane of the pollen grain allows water and oxygen to pass through but does not allow sucrose to pass through.
| Location | Sucrose concentration in g per 100 cm³ | Oxygen concentration in mg per dm³ |
|---|---|---|
| Inside the pollen grain | 6.0 | 1.5 |
| Storage solution | 12.0 | 4.0 |
Give the direction of the net movement of water and oxygen across the cell membrane.
Give the name of the process responsible for the net movement of:
water
oxygen
The storage solution is diluted until its sucrose concentration is 3.0 g per 100 cm³.
Explain why the direction of the net movement of water changes.
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.