A farmer measures the rate of photosynthesis of a crop in a glasshouse under three sets of conditions, P, Q and R. The light intensity is high and the same in all three. Table
| Condition | Temperature in ∘C^\circ\text{C}∘C | Carbon dioxide concentration in % | Rate of photosynthesis in arbitrary units |
|---|---|---|---|
| P | 15 | 0.04 | 20 |
| Q | 25 | 0.04 | 20 |
| R | 15 | 0.10 | 35 |
| Which conclusion is supported by the data? |
Temperature is limiting the rate of photosynthesis in condition P.
Carbon dioxide concentration is limiting the rate of photosynthesis in condition P.
Light intensity is limiting the rate of photosynthesis in condition P.
Temperature is limiting the rate of photosynthesis in condition Q.
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.