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Question

What are the differences between C3 and C4 pathways?

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Solution

C3 pathwayC4 pathway
Photosynthesis occurs in mesophyll cells
Photosynthesis occurs in mesophyll and bundle sheath cells.
The CO2 molecule acceptor is RuBP. The CO2 acceptor molecule is phosphoenolpyruvate.
The first stable product is a 3C compound called 3-PGA.
The first stable product is a 4C compound called OAA.
Optimum temperature is 20o to 25o C.Optimum temperature is 30o to 45o C.
Examples of C3 plants are rice, wheat and potato.
Examples of C4 plants are maize, sugarcane, Tribulus and Amaranthus.

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