Photosynthetic bacteria are grown in illuminated vessels. All conditions apart from light intensity and carbon dioxide concentration are kept the same.
The table shows the rate of photosynthesis. The rates are measured in arbitrary units.
| Carbon dioxide concentration in % | Rate at light intensity 20 arbitrary units | Rate at light intensity 80 arbitrary units |
|---|---|---|
| 0.02 | 5 | 5 |
| 0.06 | 5 | 10 |
| 0.10 | 5 | 15 |
| 0.14 | 5 | 15 |
Describe how carbon dioxide concentration affects the rate of photosynthesis at each light intensity.
Explain the difference between the results at the two light intensities from 0.02% to 0.10% carbon dioxide.
Give the most likely rate of photosynthesis at a light intensity of 80 arbitrary units and a carbon dioxide concentration of 0.18%.
Explain your answer.
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.