A fungal disease of holly plants has been found in some plant nurseries. Scientists recorded whether the disease appeared during one year in nurseries that had been free of it.
| Nurseries studied | Number of nurseries | Number in which the disease appeared |
|---|---|---|
| more than 50 km from an infected nursery, bought plants from an infected nursery | 40 | 22 |
| within 1 km of an infected nursery, bought no plants from an infected nursery | 40 | 6 |
| more than 50 km from an infected nursery, bought no plants from an infected nursery | 40 | 0 |
Use the data to explain how the fungus mainly reaches new nurseries and how its spread to new nurseries could be reduced.
112 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.