Microscopy of a cucumber leaf disease shows thread-like hyphae in the leaf tissue. Reproductive particles from diseased leaves are present in trays used to deliver seedlings to an unaffected glasshouse.
Which statement explains the later appearance of the disease in this glasshouse?
virus particles reproduce in the trays before entering healthy cucumber cells
bacteria in the trays produce hyphae after reaching healthy cucumber leaves
protist cells in the trays form spores that grow through healthy cucumber leaves
fungal spores remain in the trays during delivery and reach healthy cucumber leaves
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.