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Understanding Rate Limiting Steps in Photosynthesis
In lab you investigated the effect of light intensity on carbon dioxide removal or oxygen production
this week. A reasonable hypothesis is that photosynthesis (i.e., carbon dioxide removal and oxygen
production) should increase with light intensity. Why?
Would you expect a plant grown in dense shade to be as vigorous and fast growing as a plant in full
sunlight? No. Likewise you might expect a plant to grow at an intermediate rate in partial sunlight.
Therefore it is reasonable to expect a linear, 1:1, relationship between photosynthesis and light
intensity. This predicted relationship is shown by the blue line in the following graph.
When measurements are completed on the effect of light intensity on photosynthesis, scientists
usually find the relationship shown in red (above graph). (A) This experimental data indicates that a
1:1 linear relationship is observed at low light intensities. This suggests that light limits the rate of
photosynthesis at low light levels (
What are the most important steps of photosynthesis?CO2and H2O enter the leafLight hits the pigment in the membrane of a thylakoid, splitting the H2O into O2The electrons move down to enzymesSunlight hits the second pigment molecule allowing the enzymes to convert ADP to ATP and NADP+ gets converted to NADPHMore items...
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