A tray of bean seedlings is moved into an illuminated chamber maintained at a different temperature. A sensor records the carbon dioxide uptake rate in each of the next four minutes.
| Minute after the temperature changed | Carbon dioxide uptake rate (mg per minute) |
|---|---|
| 1 | 0.8 |
| 2 | 1.3 |
| 3 | 1.7 |
| 4 | 1.7 |
Which set of readings would give the best estimate of the rate once the seedlings have adjusted to the different temperature?
Use the readings from minutes 2 to 4.
Use the readings from minutes 1 and 2.
Use the readings from minutes 3 and 4.
Use the readings from minutes 1 to 4.
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.