A student investigated the effect of temperature on the rate of photosynthesis in pondweed.
Light intensity and carbon dioxide concentration were kept constant.
The Table shows the results.
Table
| Temperature in ∘C^{\circ}\text{C}∘C | Rate of photosynthesis in arbitrary units |
|---|---|
| 10 | 8 |
| 20 | 18 |
| 30 | 30 |
| 40 | 22 |
| 50 | 3 |
Calculate the percentage increase in the rate of photosynthesis between 10 ∘C10\ ^{\circ}\text{C}10 ∘C and 30 ∘C30\ ^{\circ}\text{C}30 ∘C.
Explain why the rate of photosynthesis increases between 10 ∘C10\ ^{\circ}\text{C}10 ∘C and 30 ∘C30\ ^{\circ}\text{C}30 ∘C.
Explain why the rate of photosynthesis decreases between 40 ∘C40\ ^{\circ}\text{C}40 ∘C and 50 ∘C50\ ^{\circ}\text{C}50 ∘C.
The student wants to find the optimum temperature for photosynthesis more precisely.
Suggest how the student could change the investigation to do this.
44 exam-style questions on Edexcel GCSE Biology 6.1 Photosynthesis, covering 6.1.1 Photosynthetic organisms as producers, 6.1.2a Limiting factors on the rate of photosynthesis, 6.1.2b Interactions of limiting factors on photosynthesis, and 6.1.3 Inverse square law and light intensity. Each one has a worked solution and a mark scheme showing where the marks go.