These results may seem perplexing if we take the adage 'a photon is a photon' to be correct, and the color of light (or more correctly, its energy level) does not make a difference in photosynthesis (which is true.)
Effect of different colors of light on the rate of photosynthesisThe effect of different lights on plant growth: incandescent light, fluorescent light, sunlight and black light.
How exactly does different colours of light effect photosynthesis?
The standard method for determining light requirements for corals' zooxanthellae has been examination of absorption characteristics of photopigments such as chlorophyll , chlorophyll etc. (good) or action spectrums (better). Both are not without problems. Absorption characteristics are usually based on pigments extracted in solvents. Spectral characteristics shift slightly according to the extraction solvent used, and photopigments, when combined, also change these characteristics slightly. A better way is to examine the action spectrum of zooxanthellae isolated from a stony coral. This is usually done with a monochromator, where a beam of pure color (hue) illuminates a culture of dinoflagellates and a reaction is determined (such as oxygen evolution). A chart of wavelengths versus reaction is then made. See Figure 1. This method also suffers from deficiencies - the two Photosystems (I and II) absorb light wavelengths with difference efficiencies, hence a monochromator might stimulate one photosystem, but not the other, and photosynthesis might not proceed efficiently (although 'spill-over' - also called State Transitions 1 or 2 - could perhaps overcome this problem - something very much in the discovery phase for zooxanthellae.) See Kirk (2000) for further details on action spectrums.
Free rate of photosynthesis papers, essays, and research papers.
The Effects of pH Levels and Phosphorous on the Photosynthesis Process of Aquatic PlantsStudy the coniferous spruce tree (Picea glauca as the species of choice) by measuring its lateral and sub-lateral branch angles in order to see how it collects sunlight from various angles on its south-facing side.
Black Light & Plant Growth | Garden Guides
The Effects of Different Colored Lights on Algal Oxygen ProductionPhotosynthesis Background Resources
Light can be measured on the light scale that ranges from red to blue
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.
Can Colored Lights Affect How Plants Grow?
Everyone knows plants are food factories, and most are aware that their energy source is light. This transformation of light into food is called photosynthesis. What may be news to you, however, is that the color of the light has a measurable impact on the amount of energy a plant absorbs. The reason for this is the colors in light have different wavelengths and those wavelengths, depending on whether they are short or long, provide different levels of energy.