A scientist compares the absorption of water and mineral ions by root hair cells from two varieties of barley. The cells have the same surface area and the same number of mitochondria. The plants are kept in identical conditions.
| Barley variety | Mean thickness of root hair cell wall in micrometres |
|---|---|
| P | 0.20 |
| Q | 0.60 |
How does the difference in wall thickness affect absorption by the root hair cells?
P takes up water at a higher rate than Q.
Q takes up mineral ions at a higher rate than P.
P and Q take up water at the same rate.
Q takes up water at a higher rate than P.
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.