A technician grew Fusarium in a fermenter for 12 hours. No additional sugar was added during this time. All other conditions were carefully controlled.
The table shows the results.
| Time in hours | Sugar concentration in g/dm³ | Mass of Fusarium in kg |
|---|---|---|
| 0 | 24 | 80 |
| 4 | 18 | 116 |
| 8 | 10 | 144 |
| 12 | 4 | 156 |
Calculate the decrease in the mean rate of increase in the mass of Fusarium between the first 4 hours and the last 4 hours.
Give your answer in kg per hour.
Explain why the falling sugar concentration could have caused the decrease calculated in part (a).
87 exam-style questions on AQA GCSE Biology 7.5 Food production, covering 7.5.1 Factors affecting food security, 7.5.2 Farming techniques, 7.5.3 Sustainable fisheries, and 7.5.4 Role of biotechnology. Each one has a worked solution and a mark scheme showing where the marks go.