A farmer tests an auxin weedkiller. The table shows mean results from equal-sized plots under otherwise similar conditions.
Table
| Treatment | Broad-leaved weeds per plot | Cereal yield in kg per plot |
|---|---|---|
| Water only | 48 | 5.0 |
| Weedkiller | 6 | 6.5 |
Which explanation best accounts for both results?
cereal ripening was prevented, increasing competition with the weeds
weed ripening was accelerated, increasing competition with the cereal
cereal growth was disrupted, leaving more resources for the weeds
weed growth was disrupted, leaving more resources for the cereal
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.