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Effects Light has on the rate of Photosynthesis Conclusion and Anlysis

By: Sarah Ann Boden Created on: 11-30-12 Biology Honors 4th Mrs. Johnson

sarah boden

on 3 December 2012

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Transcript of Effects Light has on the rate of Photosynthesis Conclusion and Anlysis

By: Sarah Boden, Makayla Spillman, Mackenzie Bissell Does Light Affect the rate of Photosynthesis ? Introduction Real World connections Light intensity is a factor in the rate of photosynthesis, which is the production of simple sugars from carbon dioxide and water, causing the release of sugar and oxygen. Without light photosynthesis could not take place. That is why the intensity and consistency of light will affect this biological process. The process takes place in the chloroplasts of green plant cells. So it is fair to say, without light the plant would die. Hypothesis: I hypothesize photosynthesis will be faster under normal light conditions.
To test our theory we set up four Experimental Groups;
Trial 1 : Spinach Discs in cylinder number one will receive no sunlight.
Trial 2: Spinach Discs in cylinder number two will receive strobe light.
Trial 3: Spinach Discs in cylinder number three will receive direct light from a lamp.
Trial 4 ( Control Group): Spinach Discs in cylinder number four will receive natural light. Summary of Proceedures Each one of our cylinders were monitored and data was recorded every minute for fifteen minutes. Here are the results:
Trial 1 (No Light): All the Spinach Discs stayed at the bottom of the cylinder for the whole time frame.
Trial 2 (Strobe Light): All Spinach Discs remained at the bottom of the cylinder during the entire time frame.
Trial 3 (Direct Light):
1 min: 0, 2 min: 1,3 min: 2, 4 min: 4, 5 min: 5, 6 min: 5, 7 min: 6, 8 min: 6, 9 min: 7, 10 min: 7, 11 min: 8, 12 min: 8, 13 min: 9, 14 min: 9, 15 min: 10.
Trial 4 (Control Group: Natural Light): All the Spinach Discs remained at the bottom of the cylinder the whole time frame. Results The big question that that the class was trying to answer was: What factors affect the rate of photosynthesis? But too narrow down this topic my group and I decided to focus on the factor; light. Our hypothesis is: I hypothesize that Photosynthesis will occur faster under normal light conditions. So we set up an experiment including four different light terms (No Light, Strobe Light, Natural Light, and Direct Light) The results did not support our hypothesis; Direct Light was the only experimental group that changed or photosynthesized. Conclusion From the results I collected, temperature( energy) had a direct correlation with photo synthesis. The reason behind this assumption is that the lamp we used during Trial 3 emitted heat. Also, when reflecting on what times of year photosynthesis is most prominent in our environment; during the seasons of spring and summer, when the weather is consistent as well as temperatures which are around high seventies and low eighties. If I were to conduct this experiment again, the following factors would be changed:
Room Temperature
Time of year when experiment is conducted
extend experiment time frame to twenty- four hours
After these changes are made I believe that the experiment will be accurate. Time (min.) Rate of Photosynthesis
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