Question 27
What is the basis for designating C3 and C4 pathways of photosynthesis?
The basis for designating C3 and C4 pathways of photosynthesis is as follows
C3 Pathway C4 PathwayIn Calvin cycle or C3 cycle (dark reaction),In C4 plants, the Calvin cycle C3 cycle occurscarbon dioxide is fixed into first stablein bundle sheath cells. Prior to reaching there,compound called 3−PGA, (3−phorphoglycericthe CO2 is trapped by mesophyll cells andacid) which is a 3 carbon compoundfixed into a 4−carbon stable product calledoxalo acetic acid.