Does photorespiration release energy ?

Open in App

Solution

Photorespiration is a process which involves loss of fixed carbon as $C O_{2}$ in plants in the presence of light. It is initiated in chloroplasts. This process does not produce ATP or NADPH and is a wasteful process. Photorespiration occurs usually when there is the high concentration of oxygen. Under such circumstances, RuBisCO, the enzyme that catalyses the carboxylation of RuBP during the first step of Calvin cycle, functions as an oxygenase. Some $O_{2}$ does bind to RuBisCO and hence $C O_{2}$ fixation is decreased. The RuBP binds with $O_{2}$ to form one molecule of PGA (3C compound) and phosphoglycolate (2C compound ) in the pathway of photorespiration. There is neither the synthesis sugar nor of ATP. Rather, it results in the release of $C O_{2}$ with the utilisation of ATP. It leads to a 25 percent loss of the fixed $C O_{2}$ . So, photorespiration does not release energy.

Suggest Corrections

Similar questions

Q. In photorespiration, release of

{CO}_{2}_{2}

occurs in

Q. The energy releasing metabolic process in which subrate is oxidised without an external electron acceptor...?
1.glycolysis 2.fermentation 3.aerobic respiration 4.photorespiration

Q. What does not occur in photorespiration?

The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called a)aerobic respiration b)photorespiration c) glycolysis d) fermentation please explain the answer

Q. How many molecules of glycine is required to release one

C O_{2}

molecule in photorespiration?

Join BYJU'S Learning Program