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  4. What is common between photosynthesis and respiration finally after reaction?

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Q. What is common between photosynthesis and respiration finally after reaction?

Respiration in Plants

Solution:

Cytochrome is a group of proteins each with an iron containing haem group that form part of the ETC in mitochondria and chloroplast. Cytochromes are necessary for both, photosynthesis and respiration. In photosynthesis, the phenomenon of photo phosphorylation, both cyclic and non cyclic require phytochromes. In cyclic photo phosphorylation which involves only PS-I, the electron released from P-700,move through FeS, cytb6 , PQ, cytf,PC and are recycled back to P-700. In non cyclic photo phosphorylation, the electrons released from PS II move through PQ, cytf, PC and reaches PS-I from which electron move to FeS, Fd, and ultimately reaches NADP to reduce it to NADPH2. Respiration includes 3 major processes glycolysis, Krebs’ cycle and electron transport chain. In ETC, two electrons move from NADH2 and travel through this ETS chain consisting of FAD, CoQ, cytb, cyt c1 ,cyt c, cyta and cyta3 and finally combine with half molecule of O2 to form water.