A researcher used four groups of seeds from the same plant species. Each group contained 50 seeds.
Some seeds were dormant. Dormancy had already ended in the other seeds. The researcher added either water or a gibberellin solution to each group.
The table shows the number of seeds that had germinated after 10 days.
| Seed condition | Treatment | Number of seeds germinated |
|---|---|---|
| Dormant | Water | 4 |
| Dormant | Gibberellin solution | 31 |
| Dormancy ended | Water | 38 |
| Dormancy ended | Gibberellin solution | 40 |
Which conclusion is supported by the data?
Gibberellin had a much greater effect on germination in dormant seeds than in seeds whose dormancy had ended
Seed dormancy affected germination only when the seeds were treated with gibberellin solution
Gibberellin had a much greater effect on germination in seeds whose dormancy had ended than in dormant seeds
Dormant seeds treated with gibberellin germinated more successfully than non-dormant seeds given water
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.