BI-781
Factors affecting photosynthesis
Biology · Secondary 3 · Hard · Factors affecting photosynthesis
A plant is placed in a sealed container with plenty of water and mineral salts. The light intensity is gradually increased while temperature and carbon dioxide concentration are kept constant. At first, the rate of photosynthesis increases, then it levels off. What is the limiting factor when the rate has levelled off?
- Light intensity, because it is still being increased.
- Temperature, because it always limits photosynthesis first.
- Carbon dioxide concentration, because it is fixed while light increases.
- Water availability, because the plant will run out of water first.
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