A student records oxygen production rates for illuminated wheat seedlings at two light intensities. A power interruption affected the second reading at 260 arbitrary units, so exclude it.
| Light intensity in arbitrary units | Rate in test 1 in cm3/min\text{cm}^3\text{/min}cm3/min | Rate in test 2 in cm3/min\text{cm}^3\text{/min}cm3/min | Rate in test 3 in cm3/min\text{cm}^3\text{/min}cm3/min |
|---|---|---|---|
| 130 | 1.8 | 2.0 | 2.2 |
| 260 | 3.4 | 1.6 | 3.6 |
How much more oxygen, on average, is produced in 6 minutes at 260 arbitrary units than at 130 arbitrary units?
9.00 cm39.00\ \text{cm}^39.00 cm3
5.20 cm35.20\ \text{cm}^35.20 cm3
1.50 cm31.50\ \text{cm}^31.50 cm3
0.25 cm30.25\ \text{cm}^30.25 cm3
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.