A scientist studies a patch of moss in bright light. Air is passed over the moss, and equipment records the cumulative volume of carbon dioxide removed from the air by the moss.
| Time / min | Cumulative volume of carbon dioxide taken up / cm3\mathrm{cm^3}cm3 |
|---|---|
| 0 | 0.0 |
| 4 | 0.8 |
| 10 | 2.6 |
Calculate the mean rate of carbon dioxide uptake from 0 to 4 minutes and from 4 to 10 minutes.
Compare the two rates.
Explain why measuring carbon dioxide uptake per minute can be used to determine the rate of photosynthesis.
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.