A supplier tests ethene on equal batches of unripe fruit of the same variety. All other conditions are controlled.
Table
| Ethene concentration in arbitrary units | Mean time to ripen in days |
|---|---|
| 0 | 12 |
| 1 | 7 |
| 2 | 4 |
| 4 | 4 |
What are the percentage reductions in ripening time when the concentration increases from 1 to 2 units and then from 2 to 4 units? Give answers to the nearest whole percent.
43%43\%43% then 0%0\%0%
43%43\%43% then 50%50\%50%
75%75\%75% then 50%50\%50%
75%75\%75% then 0%0\%0%
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.