A researcher grows six groups of a floating aquatic plant for seven days. Each group starts with the same dry mass. All conditions other than those shown in the table are kept the same.
The researcher uses the mean daily increase in dry mass to estimate the rate of photosynthesis.
| Condition | Light intensity in lux | Temperature in ∘C^\circ\text{C}∘C | Carbon dioxide concentration in % | Mean daily increase in dry mass in mg day−1\text{mg day}^{-1}mg day−1 |
|---|---|---|---|---|
| A | 6000 | 18 | 0.04 | 14 |
| B | 12000 | 18 | 0.04 | 14 |
| C | 6000 | 24 | 0.04 | 22 |
| D | 6000 | 18 | 0.10 | 14 |
| E | 12000 | 24 | 0.04 | 31 |
| F | 6000 | 24 | 0.10 | 22 |
Explain which factor is limiting the rate of photosynthesis in condition A.
After changing the conditions from A to C, suggest which factor is limiting in condition C. 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.