A scientist grew equal samples of an aquatic plant in two nutrient solutions for 14 days. All conditions were the same except for the nitrate ion concentration.
| Sample | Nitrate ion concentration in mmol/dm³ | Initial dry mass in g | Final dry mass in g |
|---|---|---|---|
| P | 0.0 | 0.40 | 0.52 |
| Q | 3.0 | 0.40 | 1.12 |
Calculate the ratio of the increase in dry mass of sample Q to the increase in dry mass of sample P.
Explain why the increase in dry mass was greater in sample Q.
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.