A student counts the number of bluebell plants at different distances into a wood.
The student also measures the light intensity at each distance.
Table
| Distance into wood in m | 0 | 10 | 20 | 30 | 40 |
|---|---|---|---|---|---|
| Light intensity in arbitrary units | 95 | 70 | 40 | 20 | 10 |
| Number of bluebells per m2\text{m}^2m2 | 42 | 30 | 18 | 7 | 2 |
Which conclusion is supported by the data?
Bluebells only grow where the light intensity is above 40 units.
Light intensity falls because there are fewer bluebells further in.
The number of bluebells is not affected by the light intensity.
The number of bluebells falls as the light intensity decreases.
111 exam-style questions on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one has a worked solution and a mark scheme showing where the marks go.