At very high light intensities, photosynthesis is slowed and then inhibited, but these light intensities do not occur in nature. Carbon dioxide — with water — is one of the reactants in photosynthesis. If the concentration of carbon dioxide is increased, the rate of photosynthesis will therefore increase. Again, at some point, a different factor may become limiting.
Beyond this concentration, further increases in the concentration of carbon dioxide will not result in a faster rate of photosynthesis, and would appear on a graph as a horizontal line.
The chemical reactions that combine carbon dioxide and water to produce glucose are controlled by enzymes. As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. When the light intensity is increased, then a higher concentration of CO 2 will be decomposed and the rate of photosynthesis increases till light again becomes a limiting factor.
Figure represents the whole concept graphically. This experiment evidently shows that the photosynthetic rate responds to one factor alone at a time and there would be sharp break in the curve and a plateau formed exactly at the point where another factor becomes limiting. For instance, with lower concentrations of the limiting factor e. Biology , Plant Physiology , Photosynthesis , Factors. Top Menu BiologyDiscussion. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes.
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Without enough light, a plant cannot photosynthesise very quickly - even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the rate of photosynthesis. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide. A good way to investigate this might be with the help of algae and you can use the 'Immobilised Algae' practical for this. Although water is needed as a raw material for photosynthesis, don't bother trying to investigate water as a variable - plants normally wilt and wither long before water restricts photosynthesis at the biochemical level.
They need water to support the plant to face the sun as well as a raw material of photosynthesis. The idea to get across is that different conditions will be most important on different occasions.
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