A : Mesophyll Cell B : Chloroplast C : Vascular Tissue D : Bundle Sheath Cell E : Stroma F : Vascular Tissue : provides continuous source of water 1 ) Carbon is fixed to produce oxaloacetate by PEP carboxylase . 2 ) The four carbon molecule then exits the cell and enters the chloroplasts of bundle sheath cells . 3 ) It is then broken down releasing carbon dioxide and producing pyruvate.
