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Q.

Choose the incorrect match among the following:

 ProcessCO2O2ATP
(1)Photosynthesisutilisedreleasedutilised
(2)N2 fixationNot involvedNot involvedutilised
(3)Photorespirationutilisedreleasedutilised
(4)Respirationreleasedutilisedproduced

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a

2

b

1

c

3

d

4

answer is C.

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Detailed Solution

  • In photorespiration oxygen is added to RuBP and CO2 is released in mitochondria.
  • Photorespiration is a process which involves loss of fixed carbon as CO2
     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 O2 does bind to RuBisCO and hence CO2 fixation is decreased. 
  • The RuBP binds with O2 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 CO2 with the utilisation of ATP. It leads to a 25 percent loss of the fixed CO2
  • So, photorespiration does not release energy.
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