Predict4 marksStandard
An experiment was carried out to investigate the effect of light intensity on the light-dependent stage of photosynthesis. A suspension of isolated chloroplasts was mixed with DCPIP, a blue redox indicator that becomes colourless when reduced. The mixture was placed at different distances from a lamp to vary light intensity, and the time taken for the DCPIP to become colourless was recorded. The results are shown below:
| Light intensity (lux) | Time for decolourisation (s) |
|---|---|
| 0 | No decolourisation after 10 min |
| 500 | 240 |
| 1000 | 120 |
| 1500 | 80 |
| 2000 | 60 |
Predict the effect on the time taken for DCPIP to become colourless if the light intensity is reduced from 1500 lux to 500 lux. Explain your answer.