A student tests four carbon dioxide concentrations at the same temperature and light intensity.
The table shows the results.
Table
| Carbon dioxide concentration in % | Gas volume in cm3\text{cm}^3cm3 per minute |
|---|---|
| 0.02 | 1.2 |
| 0.04 | 2.4 |
| 0.06 | 3.0 |
| 0.08 | 3.2 |
Which statement correctly compares the increases in gas production?
The increase from 0.02% to 0.04% is twice that from 0.04% to 0.06%.
The increase from 0.06% to 0.08% is twice that from 0.04% to 0.06%.
The increase from 0.02% to 0.04% equals that from 0.06% to 0.08%.
The increase from 0.04% to 0.06% is twice that from 0.02% to 0.04%.
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.