A cooperative producing table grapes selected 500 flowers for each of three groups. The groups received different gibberellin treatments. All other conditions were the same.
| Group | Gibberellin treatment | Flowers that formed fruit (%) | Formed fruit that were seedless (%) | Mean mass of one fruit (g) |
|---|---|---|---|---|
| P | no gibberellin | 72 | 5 | 4.8 |
| Q | two days before pollination | 86 | 90 | 7.1 |
| R | two days after pollination | 81 | 15 | 6.4 |
Calculate how many more seedless fruit would be expected in group Q than in group R.
Give your answer to the nearest whole fruit.
Explain which group the cooperative should use as its production method for large, seedless grapes. Use the results and your knowledge of plant hormones.
105 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.