A scientist measures the rate of photosynthesis of two types of seaweed at different temperatures. One type lives in a cold Arctic sea. The other type lives in a warm tropical sea.
The Table shows the results.
Table
| Temperature in ∘C^{\circ}\text{C}∘C | Rate of photosynthesis of Arctic seaweed in arbitrary units | Rate of photosynthesis of tropical seaweed in arbitrary units |
|---|---|---|
| 5 | 12 | 2 |
| 10 | 20 | 5 |
| 15 | 24 | 10 |
| 20 | 18 | 18 |
| 25 | 8 | 28 |
| 30 | 2 | 34 |
| 35 | 0 | 15 |
Give the optimum temperature for photosynthesis in the Arctic seaweed.
Explain why the rate of photosynthesis of the Arctic seaweed decreases above this temperature.
The temperature of the tropical sea rises from 25 ∘C25\ ^{\circ}\text{C}25 ∘C to 35 ∘C35\ ^{\circ}\text{C}35 ∘C.
Calculate the percentage change in the rate of photosynthesis of the tropical seaweed.
Suggest why the tropical seaweed has a higher rate of photosynthesis than the Arctic seaweed at 25 ∘C25\ ^{\circ}\text{C}25 ∘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.