Procedure:
- Cover one third of the leaves with colored cellophane. Cover another third with black paper. Leave the last third uncovered to serve as the control. Wait two days for the plants to go through photosynthesis
- Take leaves from each of the sections and place into test tubes. Boil in alcohol. Drain and rinse in cool water. Place in petri dish.
- Cover each sample in iodine. Record results after waiting 2-3 minutes.
Materials:
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Results: Expected/ observed
Control: I think the control will be a strong positive. The photosynthesis process should happen as it normally would.
Blue: The blue covering should have a slight effect on the photosynthesis process. Some light will pass through Black: The black covering should have a large effect on the process. Very little light will be able to pass through the paper. |
This sample tested a strong positive. The Iodine was a very dark blue. This was as expected since it was the control.
The Blue had some effect on the process. The iodine test was a weak positive. This was as expected. The Black covering had a very strong negative. The leaf was the color of the iodine. This was as expected. |
Reflection:
I enjoyed this project. My group completed the experiment quickly and correctly. I also enjoyed how it was not a very long drown out process. We only had to wait two days to continue the project instead of weeks. All of our data was correct and confirmed our hypothesis. One thing I would have done differently in this project was I would have rinsed the leaves more. After the boiling, the leaves were very soggy and covered in alcohol. When we went to test the leaves with the iodine solution, there was alot of liquid in the petri dish. This may have effeted our results slightly.