A technician measures the rate of photosynthesis of a young sunflower plant at two temperatures. Light intensity and carbon dioxide concentration are kept constant.
| Temperature in ∘C^\circ\text{C}∘C | Rate of carbon dioxide uptake in cm3 h−1\text{cm}^3\ \text{h}^{-1}cm3 h−1 |
|---|---|
| 30 | 36 |
| 42 | 15 |
Calculate the percentage change in the rate of photosynthesis when the temperature is increased from 30 ∘C30\ ^\circ\text{C}30 ∘C to 42 ∘C42\ ^\circ\text{C}42 ∘C.
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.