The table shows photosynthesis rates at two carbon dioxide concentrations. Temperature is constant.
Table
| Light intensity in arbitrary units | Rate at 0.04% carbon dioxide | Rate at 0.10% carbon dioxide |
|---|---|---|
| 1 | 2 | 2 |
| 2 | 4 | 4 |
| 4 | 5 | 8 |
| 8 | 5 | 10 |
Which statement best explains the pattern?
Extra carbon dioxide increases the rate at low light intensity only.
Extra carbon dioxide increases the rate equally at all light intensities.
Extra carbon dioxide increases the rate at high light intensity only.
Extra carbon dioxide decreases the rate equally at all light intensities.
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.