A bacterial pathogen reaches the outside of the trunk of a mature tree.
Which plant defence forms a physical barrier that can stop the pathogen entering the trunk?
The hairs growing from the surfaces of leaves
The antibacterial chemicals in living tissues
The layers of dead cells that form the bark
The markings that mimic eggs on the leaves
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.