A scientist places equal masses of living plant cells into chambers P and Q. Both chambers contain the same nutrient solution and provide the cells with glucose.
The cells take in mineral ions from the solution by active transport.
The table shows the results after one hour.
| chamber | oxygen availability | glucose broken down in respiration / mmol g⁻¹ h⁻¹ | ethanol produced / mmol g⁻¹ h⁻¹ | mineral ions taken in / µmol g⁻¹ h⁻¹ |
|---|---|---|---|---|
| P | available | 0.40 | 0.00 | 12.0 |
| Q | unavailable | 2.80 | 5.60 | 5.5 |
Aerobic respiration produces approximately 30 ATP molecules per glucose molecule. Anaerobic respiration in plant cells produces approximately 2 ATP molecules per glucose molecule.
Explain how the results show that the cells in chamber Q respire anaerobically.
Calculate the percentage decrease in the rate of mineral ion uptake from chamber P to chamber Q.
Calculate the estimated rate of ATP production in each chamber.
A scientist concludes that the rate of mineral ion uptake is directly proportional to the estimated rate of ATP production. Evaluate this conclusion using the results and your calculations.
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.