A student investigates the effect of light intensity on photosynthesis in pondweed.
Which variable should the student measure to determine the rate?
the temperature of water surrounding the pondweed
the distance of the lamp from pondweed
the length of pondweed used each time
the volume of gas collected per minute
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.