Four plants in a garden are diseased. Which one of these diseases will not spread from the diseased plant to a healthy plant?
Tobacco mosaic disease in the leaves of a tomato plant
Chlorosis in a tomato plant grown in low magnesium soil
Rose black spot on the leaves of a garden rose bush
An aphid infestation on the young stems of a bean plant
58 exam-style questions on AQA GCSE Biology 3.3 Plant disease, covering 3.3.1 Detection and identification of plant diseases and 3.3.2 Plant defence responses. Each one has a worked solution and a mark scheme showing where the marks go.