Equal-sized shoot and root segments were placed in solutions with different auxin concentrations. Their mean elongation after 24 hours is shown in the table.
| Auxin concentration (µmol/L) | Shoot elongation (mm) | Root elongation (mm) |
|---|---|---|
| 0.00 | 2 | 6 |
| 0.05 | 4 | 4 |
| 0.10 | 6 | 2 |
Explain how increasing the auxin concentration affects the elongation of the shoots and roots. Use the data in your answer.
87 exam-style questions on AQA GCSE Biology 5.4 Plant hormones, covering 5.4.1 Control and coordination and 5.4.2 Use of plant hormones (HT only). Each one has a worked solution and a mark scheme showing where the marks go.