Seeds were soaked in different concentrations of gibberellin.
Table shows the percentage of seeds that germinated after 7 days.
Table
| Concentration of gibberellin in arbitrary units | Percentage of seeds that germinated |
|---|---|
| 0 | 10 |
| 10 | 45 |
| 50 | 80 |
| 100 | 82 |
| 200 | 81 |
Which conclusion is supported by the data?
Germination increases as gibberellin concentration increases up to 50 units, then levels off
The percentage of seeds that germinate is directly proportional to gibberellin concentration
Gibberellin concentrations above 100 arbitrary units stop most of the seeds from germinating
Seeds of this type are unable to germinate at all unless gibberellin is added to them first
59 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.