A researcher collects two groups of leaves with the same total leaf area from a plant. One group is from the outside of the plant canopy and the other group is from inside the canopy.
The researcher illuminates each group and measures the volume of carbon dioxide taken up.
| Position of leaves | Carbon dioxide taken up in cm3\text{cm}^3cm3 | Time in minutes |
|---|---|---|
| outside canopy | 12.0 | 5 |
| inside canopy | 3.0 | 10 |
Calculate how much lower the mean rate of carbon dioxide uptake is for the leaves from inside the canopy than for the leaves from outside the canopy, as a percentage of the rate for the leaves from outside the canopy.
Give your answer to one decimal place.
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.