what is photorespiration???
Answers
Answer:
Photorespiration (also known as the oxidative photosynthetic carbon cycle, or C2 photosynthesis) refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis. ... Photorespiration also incurs a direct cost of one ATP and one NAD(P)H.
NCERT based Answer for Class 11 Biology Students
Photorespiration:
Respiration that is initiated in chloroplast under high intensity light is called photorespiration.
Relative levels of O2 and CO2 determine occurrence of photorespiration, since both gases compete for same active site of RuBisCO.
Increased O2 level increases photorespiration whereas increased CO2 level increases C3 photosynthesis.
Oxygenation of RuBP (Ribulose Bis-phosphate) results in formation of one molecule of phosphoglycolate (2 carbon compound) and one molecule of PGA.
In photorespiratory pathway, there is neither synthesis of sugars, nor of ATP.
It results in release of CO2 with utilization of ATP. Therefore, photorespiration is a wasteful process.
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