Students investigated the abundance of creeping buttercup in four meadow areas. In each area, they used the same method with randomly placed quadrats to estimate mean percentage cover.
| Area | Mean soil temperature (∘C^\circ\mathrm{C}∘C) | Mean soil moisture (%) | Mean percentage cover of creeping buttercup (%) |
|---|---|---|---|
| A | 13 | 22 | 34 |
| B | 18 | 22 | 20 |
| C | 13 | 36 | 55 |
| D | 18 | 36 | 37 |
Suggest one pair of areas that could be compared to investigate the effect of soil temperature while accounting for soil moisture. Explain what this comparison suggests.
A student states that soil moisture has no relationship with the abundance of creeping buttercup. Evaluate this statement using the data.
82 exam-style questions on Edexcel GCSE Biology 9.1 Ecosystems and interdependence, covering 9.1.1 Levels of organisation in ecosystems, 9.1.2 Abiotic and biotic factors, 9.1.3 Importance of interdependence, 9.1.4 Parasitism and mutualism, and 9.1.5 Determining number of organisms in an area. Each one has a worked solution and a mark scheme showing where the marks go.