Explain photorespiration with the help of diagram.

Dear Student,

Please find below the solution of your asked query:

  • It is a process in which oxidation of ribulose‐1,5‐bisphosphate takes place with the help of enzyme Rubisco, producing a 3‐carbon compound, 3‐phosphoglycerate, and a 2‐carbon compound, phosphoglycolate.
  • It is considered as a wasteful process because about 25 % of the CO2 fixed during photosynthesis is lost during the process moreover there is no formation of ATP & NADH.

Photorespiration Pathway-

  • The carbon lost is not retrieved. The plant may lose as much as half of the CO2 fixed during photosynthesis by this process.
  • No energy rich compound is produced and rather is a wasteful loss of ATP and NADPH.
  • With the increase in O2 concentration, affinity of RUBP carboxylase for O2 increase and for CO2 decreases. Therefore increased oxygen level increases, photorespiration, while increased carbon dioxide level decreases photorespiration.
  • It involves three organelles - chloroplast, perioxisomes and mitochondria.
  • Increase in temperature leads to more photorespiration that means more loss of photosynthetically fixed carbon.
  • It occurs in light and has no relation with the normal respiration.
  • It decreases the yield of C3 plants.
Hope this information clears your doubts about the topic.

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                                                                 Related image

Photorespiration is a wasteful pathway that occurs when the Calvin cycle enzyme rubisco acts on oxygen rather than carbon dioxide.

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