A pathogen has been confirmed in one pepper plant in each of three indoor growing rooms. The infected plants were removed.
A technician counted the aphids on 20 of the remaining plants in each room. The technician repeated the counts one week later.
| Growing room | First aphid count | Aphid count one week later |
|---|---|---|
| A | 5 | 12 |
| B | 8 | 31 |
| C | 14 | 18 |
The technician can test plants from only one growing room immediately.
Which growing room should be tested first? Explain your answer.
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.