O-LevelBiologyPlant Nutrition5090/12 · Oct/Nov 2017 · Q51 Mark
A student investigates the effect of different colours of light on the rate of photosynthesis. In three separate experiments, he shines red, blue, or green light onto an aquatic plant. The number of oxygen bubbles produced by the plant is counted. Each experiment is carried out three times and the average number of bubbles calculated. What explains the results? [Figure 5.1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AChlorophyll absorbs red and blue light more than green light.
BGreen light is absorbed by the water.
CMost of the green light is absorbed by the chlorophyll.
DRed light is used least in photosynthesis.
✓ Correct answer
A: Chlorophyll absorbs red and blue light more than green light.
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