A scientist applies an inert gel to different parts of intact camellia leaves. The gel forms a barrier but does not kill pathogens or damage the leaves.
Which treatment would block the route usually used by pathogens to enter a leaf?
Cover only the hairs on the leaf surface
Cover only the epidermal cell walls
Cover only the waxy cuticle
Cover only the stomata
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.