Electron transport chains release energy through shuttling of electrons in the reactions of photosynthesis .
it is a series of coenzymes and cytochromes through which electrons pass from one carrier to another .
Kennedy and Lehninger discovered the mitochondrial ETS present in inner mitochondrial membrane which is a series of five membrane associated proteins i.e. complex I to V .
Complex -I is called as NADH-Q reductase or NADH dehydrogenasecomplex .
Complex-II is called as Succinate-Q reductase .
Complex-III is called as cytochrome reductase .
Complex-IV is called as cytochrome oxidase .
Complex-V is called as ATP synthase .
it involves in transforming high energy electrons from NADH and FADH2 to O2 .
There is a loss of energy takes place at each step .
Photosynthesis is a physio-chemical process by which green plants use light energy to drive the synthesis of organic compounds .
it is an anabolic , end-orgonic , redox process .
it is the only process that liberate oxygen to the atmosphere by photolysis of water .
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