A meadow is surveyed at the same time each year. Field voles feed on the grass. Rainfall, grass cover and the number of field voles are recorded.
| Year | Rainfall in mm | Grass cover in % | Number of field voles per hectare |
|---|---|---|---|
| 1 | 820 | 84 | 36 |
| 2 | 790 | 82 | 35 |
| 3 | 510 | 55 | 24 |
| 4 | 480 | 41 | 17 |
Explain how the data show that the meadow community did not remain stable. Suggest how the decrease in rainfall could have caused the changes in the grass and the field voles.
82 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.