A research centre grew 30 tomato plants in the same controlled environment. Every plant received a nutrient solution containing enough magnesium ions.
On day 0, one plant had pale, discoloured patches arranged in a mosaic pattern on its leaves. The researchers recorded the number of plants showing the same leaf pattern.
| Time in days | Number of plants showing the leaf pattern |
|---|---|
| 0 | 1 |
| 7 | 4 |
| 14 | 13 |
| 21 | 28 |
Explain the most likely cause of the leaf patches and predict how the growth of the affected plants would compare with the unaffected plants.
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.