Chalara ash dieback is a disease of ash trees.
Scientists surveyed ash trees in woodlands at different distances from a woodland where the disease was first found.
The Table shows the results.
Table
| Distance from first infected woodland in km | Percentage of ash trees infected |
|---|---|
| 0 | 85 |
| 5 | 60 |
| 10 | 34 |
| 20 | 12 |
| 40 | 3 |
Describe the pattern shown in the Table.
Explain why ash trees close to the first infected woodland were more likely to be infected.
Scientists recommended that infected trees should be cut down and burned.
Explain how this would reduce the spread of the disease.
Suggest one other way the spread of Chalara ash dieback could be reduced.
43 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.