BI-2081
Factors affecting photosynthesis
Biology · Secondary 4 · Hard · Factors affecting photosynthesis
An investigation measures the rate of photosynthesis of a plant at different temperatures. Light intensity and carbon dioxide concentration are kept constant. The rate increases from 10°C to 30°C, then decreases above 40°C. What best explains the decrease above 40°C?
- Enzymes controlling photosynthesis are denatured at high temperatures.
- Chlorophyll cannot absorb light below 40°C.
- Carbon dioxide concentration falls to zero above 40°C.
- Light intensity becomes the limiting factor at high temperatures.
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