Explain photorespiration with the help of diagram - Biology - Photosynthesis in Higher Plants

Question

Explain photorespiration with the help of diagram

Abhilasha Grover · Accepted Answer

Dear Student,

Please find below the solution of your asked query:

Photorespiration-

It is a process in which oxidation of
ribuloseâ€1,5â€bisphosphate takes place
with the help of enzyme Rubisco, producing a 3â€carbon
compound, 3â€phosphoglycerate, and a
2â€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-

Features-

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

Keep asking!!

Regards

Explain photorespiration with the help of diagram.