A sensor records the volume of oxygen released by a small green plant in a chamber. Carbon dioxide and water remain available, and the temperature is kept constant. At 30 minutes, an opaque cover closes around the chamber.
| Time interval in minutes | Position of cover | Volume of oxygen released in 10 minutes in cm3\text{cm}^3cm3 |
|---|---|---|
| 20–30 | open | 0.48 |
| 30–40 | closed | 0.00 |
Explain the change in oxygen released and what happens to the rate of glucose production after 30 minutes. Refer to both stages of photosynthesis.
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.