In 2018, a strip of woodland that linked patches A and B to a larger woodland was cleared, leaving patches A and B isolated. Patch C stayed linked to the larger woodland. The number of plant species in each patch was recorded just before the strip was cleared in 2018 and again in 2024.
| Woodland patch | Linked to larger woodland after 2018? | Plant species in 2018 | Plant species in 2024 |
|---|---|---|---|
| A | No | 17 | 12 |
| B | No | 16 | 11 |
| C | Yes | 18 | 17 |
Compare the changes in the number of plant species in the isolated patches with the change in the linked patch between 2018 and 2024.
Suggest how clearing the strip could have caused the pattern in the table.
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.