A scientist investigated respiration in actively growing plant root tissue. The tissue was supplied continuously with glucose and oxygen.
Each sample was kept at its initial temperature for 20 minutes. The rate of oxygen uptake was measured during the final 5 minutes. Each sample was then transferred to 30 °C for 10 minutes and the rate was measured again.
| Initial temperature in °C | Initial rate of oxygen uptake in mm³ per gram per minute | Rate of oxygen uptake after transfer to 30 °C in mm³ per gram per minute |
|---|---|---|
| 15 | 18 | 30 |
| 30 | 31 | 31 |
| 40 | 45 | 30 |
| 55 | 4 | 3 |
Explain the pattern in the results, including the rates after transfer to 30 °C.
92 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.