A fungal pathogen reaches the surface of a young plant stem.
Which plant defence makes it difficult for the pathogen to enter each living cell?
The antibacterial chemicals made by the plant
The leaves that fall from the plant in autumn
The hairs growing from the surface of the stem
The cellulose cell wall surrounding each cell
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.