Question 9
FA scientist measured the rate of photosynthesis of a plant at different light intensities.
The temperature was kept at 20 ∘C20\ ^{\circ}\text{C}20 ∘C and the carbon dioxide concentration was kept at 0.04%.
The Figure shows the results.
Figure
Image brief:
a.[2]
Describe the effect of light intensity on the rate of photosynthesis.
Use data from the Figure in your answer.
b.[2]
Explain why the rate of photosynthesis increases between light intensities of 0 and 6 arbitrary units.
c.[2]
Explain why the rate of photosynthesis does not increase above a light intensity of 8 arbitrary units.
d.[2]
The scientist said:
"If I raise the temperature to 60 ∘C60\ ^{\circ}\text{C}60 ∘C, the rate of photosynthesis will increase."
Explain why the scientist is wrong.
6.1 Photosynthesis Questions
87 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.