bio lab 9 - Vinay Desai Introduction: The two week lab was...

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Vinay Desai Introduction: The two week lab was intended to determine the photosynthetic rate of a C 4 versus a C 3 plant when exposed to different light intensities. This was done to see which type of a plant would take up more carbon dioxide when exposed to the different light intensities. The light intensity was the determining factor for how much carbon dioxide was taken up, which made light intensity the independent variable and the photosynthesis rate the dependent variable. The reason C 4 and C 3 plants were tested against each other was because they both fix carbon dioxide in a different way. C 4 plants possess a preliminary carbon dioxide fixation pathway, which lets the plant concentrate carbon dioxide in the bundle sheath cells. On the other hand, C 3 plant do not concentrate carbon dioxide in the bundle sheath cells as carbon dioxide is embedded in the mesophyll cells. Also, C 4 plants have PEP carboxylase, which only fixes carbon dioxides, whereas C 3 plants have Rubisco that fixes both carbon dioxide and oxygen. The hypothesis was that as the light intensity increased, the photosynthetic rate would increase and then level off in the C 3 plant compared to a constant increasing rate in the C 4 plant. The reason C 3 plant’s photosynthetic rate would level off was that the C
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This note was uploaded on 06/15/2008 for the course BISC 208-012 taught by Professor Dion during the Spring '08 term at University of Delaware.

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bio lab 9 - Vinay Desai Introduction: The two week lab was...

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