A grower grows basil in an indoor growing room. The nitrate concentration in the nutrient solution and the mean mass of basil harvested from each square metre are shown in the table. Other growing conditions were kept the same.
| Nitrate concentration (mg/L) | Mean mass harvested (kg/m²) |
|---|---|
| 0 | 0.35 |
| 40 | 0.62 |
| 80 | 0.78 |
| 120 | 0.78 |
Explain the results and suggest whether the grower should increase the nitrate concentration above 80 mg/L.
127 exam-style questions on OCR GCSE Biology 6.2 Feeding the human race, covering 6.2.1 Biological factors affecting food security, 6.2.2 Agricultural solutions to growing demand, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, 6.2.5 Steps in genetic engineering, 6.2.6 Benefits and risks of gene technology in agriculture, and 6.2.7 Biotechnological solutions to growing demand. Each one has a worked solution and a mark scheme showing where the marks go.