A scientist measures the rate of photosynthesis of a crop in a field on a sunny summer day. She also measures the light intensity, the temperature and the carbon dioxide concentration in the air around the crop.
The Table shows the results.
Table
| Time of day | Light intensity in arbitrary units | Temperature in ∘C^{\circ}\text{C}∘C | Carbon dioxide concentration in %\%% | Rate of photosynthesis in arbitrary units |
|---|---|---|---|---|
| 06:00 | 5 | 10 | 0.045 | 5 |
| 08:00 | 30 | 14 | 0.040 | 25 |
| 10:00 | 60 | 18 | 0.034 | 40 |
| 12:00 | 90 | 24 | 0.030 | 42 |
| 14:00 | 95 | 26 | 0.030 | 42 |
| 16:00 | 70 | 24 | 0.032 | 41 |
| 18:00 | 30 | 19 | 0.036 | 25 |
| 20:00 | 5 | 15 | 0.040 | 5 |
Use the data in the Table to explain which factors are most likely to limit the rate of photosynthesis at different times of the day.
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.