Question

What are the differences between $C_3$ and $C_4$ pathways?

Answer 1

C${}_3$ pathway	C${}_4$ pathway
Photosynthesis occurs in mesophyll cells	Photosynthesis occurs in mesophyll and bundle sheath cells.
The CO${}_2$ molecule acceptor is RuBP.	The CO${}_2$ 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 20${}^o$ to 25${}^o$ C.	Optimum temperature is 30${}^o$ to 45${}^o$ C.
Examples of C${}_3$ plants are rice, wheat and potato.	Examples of C${}_4$ plants are maize, sugarcane, Tribulus and Amaranthus.