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Q.
Photorespiration in $ {{C}_{3}} $ plants starts from :
Punjab PMETPunjab PMET 2006
Solution:
Photorespiration is the light dependent process in which utilization of oxygen and release of $ C{{O}_{2}} $ by the photosynthesis organs of a plant takes place. Normally, photosynthetic organs are reverse in the light, i.e., uptake, of $ C{{O}_{2}} $ and release of $ {{O}_{2}} $ . This process is pronounced in $ {{C}_{3}} $ plants and negligible in $ {{C}_{4}} $ plants. At high temperature $ RuBP $ carboxylase functions as oxygenase and instead of fixing $ C{{O}_{2}} $ , oxidizes ribulose 1, 5-biphosphate to produce phosphoglyceric acid and phosphoglycolate (starting product). On hydrolysing, it forms glycolate and then glyoxylate glycine and serine respectively.