Scientists surveyed a plant species at four sites at different distances from a busy road.
| Distance from the road in m | Air pollutant concentration in micrograms per cubic metre | Plant species |
|---|---|---|
| 20 | 68 | not found |
| 100 | 45 | not found |
| 300 | 28 | found |
| 600 | 17 | found |
Give the nearest distance from the road at which the plant species was found.
Suggest how the air pollutant may affect the distribution of the plant species.
83 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.