Predict4 marksStandard
A student investigated the effect of light intensity on the rate of photosynthesis using a suspension of isolated chloroplasts and the redox indicator DCPIP. DCPIP is blue when oxidised and becomes colourless when reduced. The student measured the time taken for DCPIP to become completely colourless at different light intensities. The results are shown in the table.
| Light intensity (lux) | Time for complete decolourisation (minutes) |
|---|---|
| 200 | 25 |
| 500 | 10 |
| 1000 | 5 |
| 1500 | 5 |
| 2000 | 5 |
The experiment was conducted at 20°C. The student now wishes to repeat the experiment at a light intensity of 1000 lux but at 30°C.
Predict the time for complete decolourisation at 1000 lux and 30°C. Explain your reasoning.