Photosynthesis and Yellow Light

Topics: Photosynthesis, Light, Color Pages: 4 (899 words) Published: December 15, 2012
Photosynthesis Lab Report


The lights are essential for photosynthesis and it plays a major role. All the food we eat and all the fossil fuel we use is a product of photosynthesis, which is the process that converts energy in sunlight to chemical forms of energy that can be used by biological systems. Photosynthesis is carried out by many different organisms but usually by plants and algae. All these organisms convert CO2 (carbon dioxide) to organic material by reducing this gas to carbohydrates in a rather complex set of reactions. Electrons for this reduction reaction ultimately come from water, which is then converted to oxygen and protons. Energy for this process is provided by light, which is absorbed by pigments. Chlorophylls absorb blue and red light and carotenoids absorb blue-green light but green and yellow light are not effectively absorbed by photosynthetic pigments in plants; therefore, light of these colors is either reflected by leaves or passes through the leaves(Arizona 2007). This is why plants are green. A certain colors of light such as red and blue colors of light absorbed by the plant are more effective in driving photosynthesis than other colors of light. The wavelengths of blue (400-500) nm and red (600-700 nm) lights are the most effective and yellow and green (500-575 nm) are least effective in driving photosynthesis (Campbell). Red and blue are expected to be most advantageous for photosynthesis. The purpose of our experiment is to investigate how the wavelength of a light affects photosynthesis. We also measured how intensity of the light can affect the rate of photosynthesis. The experiment variables are intensity and color of a light and everything else such as amount of chlorophyll extract was controlled. Our hypothesis the rate of photosynthesis is lower in yellow light than white light which contains both blue and red lights in visible spectrum and stronger the...
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