A student collects gas from pondweed at two light intensities.
The table shows the results.
Table
| Light intensity | Gas volume collected in cm3\text{cm}^3cm3 | Collection time in minutes |
|---|---|---|
| Low | 4.8 | 4 |
| High | 7.2 | 3 |
How does the mean rate at high light intensity compare with the mean rate at low light intensity?
It is 3.0 times the rate.
It is 0.5 times the rate.
It is 2.0 times the rate.
It is 1.5 times the rate.
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.