A rare species of crane migrates each year through Countries P, Q and R. A proposed conservation scheme would protect wetland sites used by the cranes. Protecting the wetlands would prevent the land from being drained for farming.
An international fund has offered each country money to support the scheme.
| Country | Annual farming income that would be lost (£ million) | Annual funding offered (£ million) |
|---|---|---|
| P | 18 | 3 |
| Q | 5 | 3 |
| R | 11 | 1 |
Explain why the data may make it difficult for all three countries to agree to the scheme.
Scientists estimated the crane population before the scheme began and during the following four years.
| Time of survey | Estimated crane population | Number of sites surveyed | Month surveyed |
|---|---|---|---|
| Before the scheme | 1240 | 20 | October |
| After 1 year | 1290 | 20 | October |
| After 2 years | 1610 | 12 | September |
| After 3 years | 1360 | 20 | October |
| After 4 years | 1420 | 20 | October |
Evaluate whether these data show that the scheme has increased the crane population.
109 exam-style questions on OCR GCSE Biology 6.1 Monitoring and maintaining the environment, covering 6.1.1 Field investigation of distribution and abundance, 6.1.2 Human interactions and biodiversity, 6.1.3 Maintaining biodiversity, and 6.1.4 Environmental change and distribution of organisms. Each one has a worked solution and a mark scheme showing where the marks go.