BI-2043
Factors affecting photosynthesis
Biology · Secondary 4 · Hard · Factors affecting photosynthesis
In an investigation on photosynthesis, a plant is supplied with increasing light intensity while carbon dioxide concentration and temperature are kept constant. At low light intensity, the rate of photosynthesis increases sharply. At higher light intensity, the rate levels off and stays constant. Which statement best explains why the rate levels off?
- Another factor such as carbon dioxide concentration becomes limiting.
- Light intensity is still the only limiting factor at high light intensity.
- Chlorophyll stops absorbing light completely at high light intensity.
- The plant stops photosynthesising because all enzymes are denatured at high light intensity.
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