Why photo respiration is called waste full process?
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Thus, photorespiration is a wasteful processbecause it prevents plants from using their ATP and NADPH to synthesize carbohydrates. RuBISCO, the enzyme which fixes carbon dioxide during the Calvin cycle, is also responsible for oxygen fixation duringphotorespiration.
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RuBisCo is the enzyme that adds CO2 to a sugar which then enters the krebs cycle and it proceeds normally. . It can also add oxygen when the oxygen concentration is high.. That is called photorespiration.
"Simplified biochemistry
Rubisco favors carbon dioxide as a ligand to oxygen,[1] however, photorespiration occurs when there is a high concentration of oxygen relative to carbon dioxide. The first reaction produces phosphoglycerate and phosphoglycolate (PPG), PGA re-enters the Calvin cycle and is simply converted back to RuBP.
PPG, however, is more difficult to recycle and has to move from the chloroplast to the peroxisomes, and then to the mitochondria, undergoing many reactions on the way, before the atoms can return into the Calvin cycle.
...Photorespiration produces no ATP and leads to a net loss of carbon and nitrogen (as ammonia), slowing plant growth."
Hope helps;)
"Simplified biochemistry
Rubisco favors carbon dioxide as a ligand to oxygen,[1] however, photorespiration occurs when there is a high concentration of oxygen relative to carbon dioxide. The first reaction produces phosphoglycerate and phosphoglycolate (PPG), PGA re-enters the Calvin cycle and is simply converted back to RuBP.
PPG, however, is more difficult to recycle and has to move from the chloroplast to the peroxisomes, and then to the mitochondria, undergoing many reactions on the way, before the atoms can return into the Calvin cycle.
...Photorespiration produces no ATP and leads to a net loss of carbon and nitrogen (as ammonia), slowing plant growth."
Hope helps;)
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