A biologist measures respiration in the tail muscle of a salmon swimming at two speeds.
| Swimming speed | Oxygen use in arbitrary units per minute | Lactic acid production in arbitrary units per minute |
|---|---|---|
| Slow | 25 | 4 |
| Fast | 55 | 4 |
Which conclusion is supported by the results?
the extra oxygen is used to remove all lactic acid as it forms
the unchanged lactic acid value shows that anaerobic respiration has stopped
the higher oxygen use shows that glucose is being broken down less completely
aerobic respiration increases while anaerobic respiration remains at the same rate
98 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.