A scientist prepares four identical vessels, each containing equal volumes of the same suspension of photosynthetic bacteria.
The vessels are kept at the same temperature and light intensity for 30 minutes. Only the concentration of sodium hydrogencarbonate is changed.
| Concentration of sodium hydrogencarbonate in g dm−3\text{g dm}^{-3}g dm−3 | Volume of oxygen collected in cm3\text{cm}^3cm3 |
|---|---|
| 0.0 | 0.4 |
| 0.5 | 1.8 |
| 1.0 | 3.0 |
| 2.0 | 3.0 |
Explain the pattern in the results and predict the volume of oxygen that would be collected in 30 minutes at a sodium hydrogencarbonate concentration of 4.0 g dm-3.
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.