Plants utilize the process of photosynthesis to convert solar energy into chemical energy to produce cellular respiration. The process of photosynthesis uses the energy of sunlight, which is then absorbed into different pigment types to help the cyclical functions that eventually create atmospheric oxygen. In this experiment we asked how different colors of light effect the rate of photosynthesis. The experiment attempted to see how blue colored and red colored lights affected the rate of photosynthesis. It was hypothesized that because plants absorb more red light, then we predict plants in red light should have a higher rate of photosynthesis when compared to plants in blue. The hypothesis was tested by taking the leaves of a live plant and placing the leaves in a flask. A carbon dioxide gas probe was then placed in the flask to test if the levels of carbon dioxide changed. The independent variable was the color of light and the dependent variable was the rate of photosynthesis in change in levels of carbon dioxide per minute per gram. The change in carbon dioxide levels were proportional to the rate of photosynthesis. Thus red light and blue light was placed upon the flasks of leaves for a total of thirty minutes. The first and last ten minutes the leaves were set in the light and the second ten- minute increment the leaves were in the dark. The second ten minutes was to see if carbon dioxide levels decreased thus to control the cellular respiration. The results show in comparing the carbon dioxide levels that the p=value is .36 meaning there was no significance in the comparison. Therefore the different wavelengths in light made no extreme difference on the rate of photosynthesis. In comparison to other experiments done by others the results were much the same finding that neither light wavelength affected the rate of photosynthesis. The experiment was done with a limited amount of time and the leaves were most likely dead by the end of the experiment. A better hypothesis would be to see how the wavelengths of different colored lights like yellow and green affect the rate of photosynthesis. The use of more live plants would help obtain better results also.
Factors that Affect the Rate of Photosynthesis Water – extremely low water amounts reduce or stop photosynthesis. Too much water kills the plant. Temperature – temperatures below 32 O F and above 95 O F slow down photosynthesis. Light intensity – increasing intensity increases photosynthesis up to a certain point, then it levels off and can’t increase any further.
Spectralight I and II Users: Come Out of the Dark and Into the Light!
Electrons in Photosynthesis Sunlight “excites” the electrons in chlorophyll. The excited electrons then “carry” the energy from the sun with them. Electron carriers – protein molecules that carry the excited electrons; NADP + becomes NADPH when an electron is added and is the final electron acceptor
Growing Plants under Different Colored Lights;
What every grower needs to know is our research with other brands of LED grow lights, as well as plant science research, shows that most LEDs lights generate the wrong ratio and intensity of wavelengths, which works against photosynthesis.
Different colors of light changed to see how ..
You can relate these results to Exercise A, Part 3. Remember how it was shown that wavelengths of red (610 - 700 nm) and blue (450 - 500 nm) resulted in the greatest amount of photosynthesis? The same is shown here in the graph - light is absorbed by the pigments better at those wavelengths as compared to others. Green, once again, is absorbed least. It ain't easy being green. ;-)
Science Fair Projects - Do different colors of light affect ..
There are four things that are required by the plant before it can carry out photosynthesis, they are light, chlorophyll, carbon dioxide and water ....
Factors That Affect Photosynthesis: Colored Lights - …
Cellular processes Unit 3 Grab scissors, glue, color pencils (4 different colors) [Notebook: Create a new Unit 3 – pocket, Title: Cellular Processes, Enter in table of content]