Outline5 marksStandard
The table below shows the mean cell length of coleoptile segments (plant shoots) treated with auxin and untreated control over time.
| Time (min) | Mean cell length (µm) – untreated control | Mean cell length (µm) – auxin treated |
|---|---|---|
| 0 | 50 | 50 |
| 30 | 52 | 65 |
| 60 | 54 | 78 |
Outline: (a) How auxin stimulates cell elongation in plant shoots, with reference to the data in the table. (b) The sequence of events leading to closure of a Venus fly trap leaf after a sensitive hair is stimulated. (c) The role of gibberellin in the germination of barley seeds.