A conservation group uses random coordinates to place five 1 m2 quadrats in an area of clifftop grassland.
The numbers of thrift plants recorded are shown in the table.
| Quadrat | Number of thrift plants |
|---|---|
| 1 | 4 |
| 2 | 7 |
| 3 | 5 |
| 4 | 8 |
| 5 | 6 |
The estimated number of thrift plants in the whole area is 540.
What is the total area of the clifftop grassland surveyed?
3240 m23240\,\mathrm{m}^23240m2
18 m218\,\mathrm{m}^218m2
90 m290\,\mathrm{m}^290m2
108 m2108\,\mathrm{m}^2108m2
82 exam-style questions on Edexcel GCSE Biology 9.1 Ecosystems and interdependence, covering 9.1.1 Levels of organisation in ecosystems, 9.1.2 Abiotic and biotic factors, 9.1.3 Importance of interdependence, 9.1.4 Parasitism and mutualism, and 9.1.5 Determining number of organisms in an area. Each one has a worked solution and a mark scheme showing where the marks go.