A scientist placed living cells from a potato tuber in a sealed container of glucose solution.
The scientist recorded these measurements.
| Time in minutes | Dissolved oxygen concentration in mg dm⁻³ | Ethanol concentration in g dm⁻³ |
|---|---|---|
| 0 | 7.6 | 0.0 |
| 10 | 3.8 | 0.0 |
| 20 | 0.0 | 0.2 |
| 30 | 0.0 | 0.6 |
Which sequence of respiration is shown by the measurements?
Anaerobic respiration occurred first, followed by aerobic respiration.
Only anaerobic respiration occurred throughout the 30 minutes.
Aerobic respiration occurred first, followed by anaerobic respiration.
Only aerobic respiration occurred throughout the 30 minutes.
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.