A fungal pathogen lands on the surface of a courgette leaf. The leaf has a physical defence covering its outer surface. If the pathogen passes through an opening in this defence, it reaches the cells inside the leaf.
Give the name of the physical defence covering the outer surface of the leaf.
Name the openings through which pathogens can usually enter the leaf.
The pathogen reaches the cells inside the leaf. Explain how the leaf cells are protected by a further physical defence.
133 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.