bio lab report8 - Sheldon Pope (with Sam Moore, Tim Walker,...

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Sheldon Pope (with Sam Moore, Tim Walker, and Laum ??) Lab section L19 11-15-07 Title: Photosynthesis Introduction: Photosynthesis is one of, if not the most important process of life on earth. Only plant organisms can undergo photosynthesis, despite this fact most organisms require directly or indirectly something from this process. Chemical energy is created in photosynthesis by two processes. The first is the light reaction process which requires sunlight to be completed. The second process is the dark reaction; this does not require any light to be completed. The light reaction uses H 2 O, light and NADP + . This reaction happens in the thylakoids of the chloroplast in a plant cell. The membrane of the thylakoid creates an electron transport chain when the electrons are excited. The transport chain changes NADP + into NADPH which stores energy. The electrons also turn ADP into ATP which can also be used for energy. The dark reaction requires CO 2 which can be found in the air. Also required are the products from the light reaction. The dark reaction creates carbohydrates and sugars. When light hits a leaf on a plant, it looks green. Light strikes chlorophyll and electrons are excited which move them around inside the membrane. The electrons quickly become unexcited as the light is turned off. If the green reflected light were to show after the light was turned off then this would show that the chloroplasts had fluorescence. Fluorescence is when electrons are held in an excited state after the energy putting them there has subsided. Electrons move with or without CO 2 in a process using electron-acceptors. This is called electron transport. Electron transport can be detected using a dye called DCPIP which changes from blue to clear depending on how many electrons are absorbed.
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Chlorophyll appears green because it emits the green wavelength the strongest. The waves of light absorbed by the chlorophyll are the waves that the plant needs for photosynthesis. This is the absorption spectrum, the waves that are used in photosynthesis are said to be in the
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This lab report was uploaded on 04/18/2008 for the course BIOLOGY 41 taught by Professor Albaker during the Fall '08 term at New Hampshire.

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bio lab report8 - Sheldon Pope (with Sam Moore, Tim Walker,...

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