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Exploring the rate of photosynthesis

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Marcelle Miriam

on 12 March 2014

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Transcript of Exploring the rate of photosynthesis

Answer to the hypothesis: The results were consistent with the given hypothesis because under blue lighting, the rate of oxygen production increased over 500% compared to the rate of oxygen production under a white light.
In the experiment, the plant was left in complete darkness for over 36 hours. The once CO2-enriched water [that was created by blowing CO2 in from a straw] had turned a dark plum color (which means less CO2) . This is so because the phenol red dye detected high CO2 levels within our test tube due to cellular respiration in the dark (not photosynthesis).
Photosynthesis Experiment:
Carbon Dioxide Experiment:
In the dark,
the plant
does not photosynthesize, but rather conducts cellular respiration. The phenol red dye turns a redish color when it detects CO2, and the darker the red means the less CO2 within the water. In darkness, the plant still consumes more CO2, but not enough to lighten the color of the dye [because it releases CO2 too].
During the process of photosynthesis and cellular respiration, each and every factor that goes in and out of these processes is critical to the finishing product. These products include oxygen, sugars, water, and carbon dioxide. The oxygen production rate increases when under blue lighting because plants absorb blue [as well as red] wavelengths more efficiently than green, white, or yellow wavelengths. This is shown in this experiment because the plant gave off more oxygen bubbles under a blue light. Some experimental errors or problems that occurred were that only one trial was done in this experiment to try and find the oxygen production rate of elodea. Another lesson this experiment has taught is that cellular respiration works in the dark, while photosynthesis works when the plant is exposed to light photons. Plants work and function similar to humans because every cell within a plant has a certain function to create the big picture. The chemical equation of cellular respiration is the same as a humans because we take in sugars and oxygen, and breathe out carbon dioxide and moisture (water). This experiment, besides the trial error, was overall successful since it was able to stay consistent with the hypothesis.
Friday, March 7, 2014
By Miracelle Philosobaum
Hypothesis: If we place a plant under blue lighting, then the rate of oxygen production will increase, because it absorbs blue wavelengths and catalyzes photosynthesis.
Photosynthesis Experiment:
Before the experiment, sodium bicarbonate is added to a container filled with tap water to create CO2-enriched water for the experiment. We stuffed a test tube with elodea and the newly created carbonated water. Because CO2 is broken down during photosynthesis, oxygen is its waste product. The test tube was then turned upside down to trap the carbonated water and elodea. Since it was turned upside down, the plant gave off its waste product, in the form of oxygen bubbles. Thus, the air bubbles were an easy way to measure the rate of oxygen production per minute.
Exploring the Rate of Photosynthesis
Photosynthesis is a process of converting energy from the sun (photons) and storing it in the chemical bonds of sugars and other food molecules they make. They take in CO2 from the air and break it down so that oxygen is its waste product as well as sugars, such as glucose and sucrose. Not only do plants take in CO2 and photons but also water. H20 goes into the process of renewing electron molecules to continue the Calvin Cycle.
Chemical equation:
6CO2 + 6H2O + sunlight = C6H12O6 + 6O2
Having access
to light, the
plant is able to
conduct photosynthesis and take in more CO2. When the plant consumes more CO2, the phenol red dye lightens in color and becomes a pinkish-yellow. Nevertheless, the plant still cannot release as much CO2 as it is able to consume.
[to the experiment]
...continued (the data)
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