A scientist places living apple cells in a sealed flask containing glucose solution.
The table shows the concentrations of substances in the flask.
| Time in hours | Oxygen concentration in mmol dm⁻³ | Glucose concentration in mmol dm⁻³ | Ethanol concentration in mmol dm⁻³ | Carbon dioxide concentration in mmol dm⁻³ |
|---|---|---|---|---|
| 2 | 0.00 | 18.5 | 0.1 | 0.3 |
| 6 | 0.00 | 14.0 | 2.4 | 2.7 |
Explain what the results show about respiration in the apple cells between 2 hours and 6 hours.
After 6 hours, the scientist passes a continuous supply of oxygen into the flask. Explain how this would affect the yield of ATP from each molecule of glucose.
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.