October 26, 2014
Lab 7 Report
Lights Distance and Wavelength Effect on Photosynthesis
Photosynthesis and cellular respiration are often mistaken as the same thing. Although they are similar in many ways, photosynthesis and cellular respiration are the exact opposite of each other. Not figuratively, but literally the reverse (Photosynthesis). They incorporate the others products while adding some outside energy to create a never ending cycle. This brings us to the photochemical and biochemical reactions of photosynthesis and cellular respiration. In an ordinary photochemical reaction, carbon dioxide, water and light energy produce glucose and oxygen. These products transfer to the biochemical reaction, where light is not needed but ATP is. Glucose and oxygen then produce carbon dioxide, water and ATP (Fleming). After knowing the few basics of photosynthesis and cellular respiration, we are able to move into visualizing the process through a few experiment. Rate of photochemical reaction by distance from a light source (Light intensity) It is understood that the closer something is to a light source, the more intense the light is because there are less light photons per square area the further it is from the light source. So, the plants closest to the light will react more quickly than the others further away. We set up and experiment with a few tubes mixed with DPIP which turns clear when reduced (Haltsclaw). Then using a spectrophotometer, we can see the rates of reaction. There are many variables to take into consideration but the most important is the spectrophotometer and the tubes time away from the original light source. The spectrophotometer beams heavy amounts of light into the tubes so we kept them in there for as little time as possible. Considering the walk from the light sources we kept the tubes covered to prevent any external light to cause further reaction. In the end, all the tubes, except for the dark turned almost...
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