A crop adviser receives three anonymous reports about damaged plants. The names of the diseases or pests have not been provided.
| Case | Evidence recorded |
|---|---|
| P | The leaves developed pale, discoloured patches in a mixed pattern, and the plants grew poorly. |
| Q | Dark purple spots appeared on the leaves, which later turned yellow and dropped from the plants. |
| R | Large numbers of small organisms pierced the phloem with sharp mouthparts and fed on sugary sap. |
Name the disease in case P and the type of pathogen that causes it.
Name the disease in case Q and the type of pathogen that causes it.
Name the pest in case R and the type of organism it is.
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.