A fungal disease is affecting strawberry plants. During rain, water splashes the pathogen from infected leaves onto nearby plants. A grower removes plants with visible symptoms.
Why does removing these plants reduce the spread of the disease?
Fewer infected leaves remain for rain to splash the pathogen from onto healthy plants.
Less pathogen remains in the soil, so fewer pathogens are splashed upwards onto leaves.
Less rain reaches healthy plants, so fewer pathogens are washed onto their leaves.
Fewer healthy plants remain to be infected after the pathogen is splashed by rain.
252 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.