Ecologists use a formula to estimate the age of ancient boundary hedges based on the diversity of species:
Estimated age (years)=(mean number of woody plant species per 30 m)×120+25 \text{Estimated age (years)} = (\text{mean number of woody plant species per } 30\text{ m}) \times 120 + 25 Estimated age (years)=(mean number of woody plant species per 30 m)×120+25The table below shows the data collected from five different hedges:
| Hedge | Mean number of woody plant species per 30 m30\text{ m}30 m |
|---|---|
| A | 1.8 |
| B | 2.5 |
| C | 3.4 |
| D | 4.2 |
| E | 2.1 |
Calculate the estimated age of the hedges in Hedge C.
67 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.