A grower investigated the effect of gibberellin on the germination of seeds.
The grower soaked 200 seeds in water and 200 seeds in gibberellin solution. The seeds were then kept in the same conditions.
The Table shows the results.
Table
| Day | Percentage of seeds germinated in water | Percentage of seeds germinated in gibberellin solution |
|---|---|---|
| 2 | 0 | 10 |
| 4 | 5 | 45 |
| 6 | 15 | 80 |
| 8 | 30 | 92 |
| 10 | 40 | 94 |
Calculate how many more seeds had germinated by day 8 in the gibberellin solution than in water.
Describe the effect of gibberellin on germination.
Use data from the Table in your answer.
Explain how gibberellin causes seeds to germinate.
Suggest why a grower would want all the seeds in a crop to germinate at the same time.
46 exam-style questions on Edexcel GCSE Biology 6.3 Plant hormones, covering 6.3.1 Plant hormones and tropisms and 6.3.2 Commercial uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.