A student estimates the number of oak seedlings in a woodland section measuring 30 m by 20 m. The student places six square quadrats, each measuring 0.5 m by 0.5 m, at random positions in the woodland.
| Quadrat | Number of oak seedlings |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 1 |
| 5 | 5 |
| 6 | 3 |
Calculate the estimated number of oak seedlings in the woodland section.
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.