Plant tissue is supplied with glucose in a chamber from which oxygen has been removed. The concentrations of substances in the solution around the tissue are measured at the start and after 2 hours.
| Substance | At start | After 2 hours |
|---|---|---|
| Glucose | 8.0 g/L | 7.1 g/L |
| Ethanol | 0.0 g/L | 0.46 g/L |
| Carbon dioxide | 0.0 g/L | 0.44 g/L |
Explain what the results indicate about the respiration taking place in the plant tissue and why it transfers only a small amount of energy to ATP.
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.