A student investigated the number of dandelion plants on a school field.
The field is a rectangle 50 m long and 30 m wide.
The student placed eight 1 m2 quadrats at random on the field and counted the number of dandelions in each quadrat.
The Table shows the results.
Table
| Quadrat | Number of dandelions |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 0 |
| 4 | 4 |
| 5 | 6 |
| 6 | 2 |
| 7 | 4 |
| 8 | 0 |
Describe how the student could place the quadrats at random on the field.
Calculate the mean number of dandelions per quadrat.
Calculate the estimated number of dandelions on the whole field.
Explain why the student used eight quadrats rather than one quadrat.
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.