A student measures the oxygen concentration in a nutrient solution and the growth rate of lettuce roots. The roots are kept at each oxygen concentration for the same length of time.
| Oxygen concentration in nutrient solution (mg/L) | Root growth rate (mm/day) |
|---|---|
| 0.5 | 2 |
| 2.0 | 7 |
| 6.0 | 16 |
| 8.0 | 17 |
The oxygen concentration in the nutrient solution is reduced to 1.0 mg/L. Predict the root growth rate at this oxygen concentration. Use the results and your knowledge of respiration to explain your prediction.
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.