Outline5 marksStandard
An experiment was carried out to investigate the effect of auxin on cell elongation in stem segments of a plant. Segments of equal initial length were placed in buffer solution; one set was treated with auxin and the other set was untreated (control). After 1 hour, the following measurements were taken:
| Sample | Final length (mm) | Cell wall pH |
|---|---|---|
| Control (untreated) | 10.2 | 5.5 |
| Auxin-treated | 11.5 | 4.5 |
Both sets had an initial length of 10.0 mm.
Using the data above, outline the mechanism by which auxin stimulates cell elongation in plants.