Unformatted text preview: under the right conditions to show any sort of increase, however minimal it might be. From tube four to seven, the amount of decrease of absorbency increases with each tube’s passing. Tube four falls from .7 to .68, tube five falls from .9 to .67, tube six from 1.1 to .62 and finally tube seven falls from 1.6 to .62, the largest decrease in absorbency observed. This can be attributed to the different amount of light presented to the tubes which all had the same chloroplast and DCPIP present. In tubes eight and nine, the effects of herbicides present in the solution of chloroplasts and DCPIP were tested. The conditions were no light and little light, accordingly, and therefore showed very little signs of change and in fact did not change in absorbency level over the period of thirty minutes. This results from the pesticide 3-(3,4-dichlorophenyl)-1,1-dimethylurea, or DCMU, effectively stopping the flow of electrons by inactivating Photosystem II....
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This lab report was uploaded on 04/07/2008 for the course ZOO 116 taught by Professor Dr.russell during the Spring '08 term at Miami University.
- Spring '08