Photosynthesis lab

Photosynthesis lab - The Effects of Color (Wavelength) on...

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The Effects of Color (Wavelength) on the Rate of Photosynthesis Pinal Patel TA: Joseph LaMattina 8:00 AM Wednesday Lab October 27, 2010
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Introduction Energy comes to Earth mainly in the form of light (visible radiation) from the sun. Approximately 70% of this light is absorbed by Earth, warming it. Since it has become warmer than its surroundings, Earth radiates energy in the form of heat energy. Energy flow through an ecosystem is a one-way process. Energy transformations in living systems involve the oxidation and reduction of carbon. The oxidation of carbon releases energy and is called cellular respiration. ATP functions in cells as a temporary carrier of energy. NAD and NADP also function as temporary energy carriers in cells. NADPH is the reduced, energy-rich form of NADP and functions in photosynthesis. The basic Photosynthesis reaction is: 6CO 2 + 12H 2 0 + Energy (light) ---> C 6 H 12 O 6 + 6CO 2 + 6H 2 O Photosynthesis can be divided into two general steps. In the first step, light energy is trapped to produce NADPH and ATP. “The effect has been observed in the saturating light with fully expanded leaves of high photosynthetic capacity” (Viil, 2006). Since light is required for the production of both of these, this step is referred to as the light-dependent reaction of photosynthesis. “Under atmospheric conditions, plant leaf respiration is strongly O2 saturated. However, hypoxia is a frequent stress factor in plant root, where diffusion of oxygen strictly rate limiting. In leaf cells, the diffusion of oxygen may exert resistance for respiration under experimental conditions where the external O2 concentration is very low” (Laisk, 2007). Second step of photosynthesis results in the production of glucose from CO2. This process is often called CO2 fixation, or the Calvin Cycle. “The increased supply of energetic cofactors suggests that
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Photosynthesis lab - The Effects of Color (Wavelength) on...

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