Several green radish seedlings are placed in a sealed transparent container in bright light. A sensor records the oxygen concentration inside the container.
| Time (hours) | Oxygen concentration (%) |
|---|---|
| 0 | 20.9 |
| 4 | 21.3 |
Explain why the oxygen concentration changed during the four hours.
117 exam-style questions on OCR GCSE Biology 1.4 Photosynthesis, covering 1.4.1 Photosynthesisers as biomass producers, 1.4.2 Factors affecting the rate of photosynthesis, and 1.4.3 Limiting factors in photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.