Analysis:
1. The phenol red changes color when we blow into the tube because it changes color depending on the carbon level. So when we blow our carbon into the tube, it changes to a yellowish color.
2. It took about 30-45mins for the water in the tube to change back from yellow to red. It indicates that the elodea plant was performing photosynthesis and was absorbing the carbon dioxide.
3. Because the reaction requires energy, and plants get their energy from the ATP made during the light dependent reaction.
4. No I did not see any change in the color of the phenol red in the tube that contained no elodea. That means that photosynthesis occurred in the plant.
5/6. I don't think Carbon Fixation occurs in humans. We don't use the carbon dioxide in our bodies. We receive the oxygen that plants release, and we then release the carbon they use.
7.The control is used to compare the reaction before and after. The main purpose is to see if any reaction occurred, and if it follows your hypothesis.
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