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| Electron Transport System |
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| Electron transport chain refers to the light driven reactions of photosynthesis. They were first formulated in 1939 by Robert Hill. |
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| The two photosystems are connected in series with each other by the components of electron transport system. The reaction centres become so excited that they escape high energy electron (e-) which move to nearby electron acceptor molecules. The electrons move through two pathways - non-cyclic and cyclic. The non-cyclic electron transport system involves participation of both PS-II and PS-I, whereas cyclic electron transport chain involves only PS-I. |
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| The light energy of specific wavelengths is absorbed by chlorophylls and accessory pigments of PS-II. These pigments transfer their absorbed energy to PS-II reaction centre - P680 (chlo 680). This centre become photo excited and exudes an electron with a gain of energy (23 K Cal/mol). |
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| The electron is immediately accepted by the primary acceptor quinone. The reaction centre comes to ground state by getting an electron from photo-oxidation of water. (The overall process involving conversion of light energy into chemical form is called quantum conversion). |
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