A student measures the rate of photosynthesis of a plant at different light intensities and at two carbon dioxide concentrations. The temperature is kept the same throughout. The table shows the results. Table
| Light intensity in arbitrary units | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Rate of photosynthesis at 0.04% carbon dioxide in arbitrary units | 10 | 20 | 28 | 30 | 30 | 30 |
| Rate of photosynthesis at 0.10% carbon dioxide in arbitrary units | 10 | 20 | 30 | 40 | 48 | 50 |
| Which factor is limiting the rate of photosynthesis at 0.04% carbon dioxide and a light intensity of 5 arbitrary units? |
light intensity
temperature
carbon dioxide concentration
the amount of chlorophyll
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.