Outline5 marksStandard
An experiment was carried out to investigate the effect of auxin on cell elongation in oat coleoptile segments. Segments of equal length (5.0 mm) were placed in either a control solution (buffer only) or a solution containing auxin (10⁻⁶ mol dm⁻³). The length of each segment was measured at intervals over 30 minutes. The results are shown in the table.
| Time (min) | Control length (mm) | Auxin-treated length (mm) |
|---|---|---|
| 0 | 5.0 | 5.0 |
| 10 | 5.2 | 5.5 |
| 20 | 5.4 | 6.2 |
| 30 | 5.6 | 7.0 |
Outline the mechanism by which auxin stimulates cell elongation in plant shoots. Use the data in the table to support your answer.