A scientist grew identical bean seedlings with their roots in a nitrate solution. The nitrate concentration in the solution was 2.0 mmol/dm³. The nitrate concentration inside the root hair cells was 8.0 mmol/dm³.
The scientist added different concentrations of a substance that reduces the amount of energy released by respiration.
| Concentration of substance in mg/dm³ | Mean rate of nitrate ion uptake in micromol/g of root/hour |
|---|---|
| 0 | 6.4 |
| 5 | 4.1 |
| 10 | 1.9 |
Explain the effect of increasing the concentration of the substance on the uptake of nitrate ions by the root hair cells. Use information from the table and the nitrate concentrations in your answer.
74 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.