alleryPhotorespiration is the
AOxygenase activity of RuBisCO in C3 plants
BCarboxylase activity of RuBisCO in dark
CCyclic phosphorylation of PS II only
DSplitting of water at the thylakoid
Answer & Solution
Correct answer: A. Oxygenase activity of RuBisCO in C3 plants
RuBisCO's active site can bind both CO2 and O2. When O2 binds (especially in high O2, low CO2, hot conditions of C3 plants), RuBP becomes phosphoglycerate + phosphoglycolate.
This 'photorespiration' wastes energy without making sugar or ATP.
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The stages of the Calvin cycle in order areIn photolysis of water:Photosynthesis takes place primarily in theIn C₃ cycle, first stable product is:The C4 pathway is also known as theIn the Z-scheme, electrons removed from PS II are replenished byBlackman's Law of Limiting Factors states thatC4 plants lack photorespiration because