A council manages a 120-hectare peat bog that was drained many years ago. The council is considering two plans.
Plan R: block the drainage channels to restore waterlogged conditions.
Plan W: leave the drainage channels open and plant trees that will later be harvested for timber.
Scientists used evidence from small-scale trials to predict the outcomes for the whole site after 10 years.
| Measurement | Plan R | Plan W |
|---|---|---|
| Total number of species recorded in a standard survey | 63 | 38 |
| Net carbon dioxide released in tonnes per hectare per year | 1.9 | 10.7 |
| Mean management cost in £ per hectare per year | 540 | 260 |
| Number of full-time jobs supported across the site | 2 | 7 |
Evaluate the two plans. Recommend which plan the council should use.
Use the information in the table.
84 exam-style questions on AQA GCSE Biology 7.3 Biodiversity and the effect of human interaction on ecosystems, covering 7.3.1 Biodiversity, 7.3.2 Waste management, 7.3.3 Land use, 7.3.4 Deforestation, 7.3.5 Global warming, and 7.3.6 Maintaining biodiversity. Each one has a worked solution and a mark scheme showing where the marks go.