Tobacco mosaic virus infects tomato plants.
Name the sign of disease that this virus produces on the leaves of a tomato plant.
Explain why an infected tomato plant grows more slowly than a healthy tomato plant.
Give one method a grower could use to confirm that this virus is the cause.
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.