A technician compares four batches of radish seedlings grown for four weeks under the same conditions. The table shows the mean increase in shoot height and the observations recorded for each batch.
| Batch | Mean increase in shoot height in cm | Observation |
|---|---|---|
| W | 3 | Leaves are green and normally shaped |
| X | 12 | Small insects are visible on the stems |
| Y | 11 | Soft areas of decay are present on the lower stems |
| Z | 13 | Swollen growths have formed on several leaves |
Which batch of seedlings was most likely deficient in nitrate ions?
Batch W
Batch Y
Batch Z
Batch X
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.