Identify A and B in the given diagram.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

	A	B
(1)	OAA	Malic acid
(2)	Malic acid	PEP
(3)	Malic acid	Pyruvic acid
(4)	OAA	PGA

A - malic acid
B - pyruvic acid

Malic acid (4 C) compound is produced in the mesophyll cell and transported to the bundle sheath cell where it is decarboxylated to a 3 C compound. Pyruvic acid is a 3 carbon compound transported back to the mesophyll cell, and it is converted to PEP.