A grower produces tomatoes in large glasshouses. Last year, tobacco mosaic virus (TMV) infected some of the plants and the grower's yield of tomatoes fell.
Explain how an infection with TMV reduces the yield of tomatoes from a glasshouse, and describe what the grower could do to reduce the loss of yield in future years.
Explain why the grower cannot spray the infected plants with a chemical that kills the virus.
176 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.