C4 pathway explain??

This pathway was worked out by Hatch and Slack (1965, 1967), mainly operational in plants growing in dry tropical region like Maize, Sugarcane, Sorghum etc. In this pathway first stable product is a 4-carbon compound Oxaloacetic acid (AAO) so called as  pathway.  plants have Kranz Anatomy (vascular bundles are surrounded by bundle sheath cells arranged in wreath like manner), characterized by large no of chloroplast, thick wall impervious to gases and absence of intercellular spaces. The primary  acceptor is a 3-carbon molecule Phosphoenol Pyruvate present in mesophyll cells and enzyme involved is PEP carboxylase. OAA formed in mesophyll cell forms 4-carbon compound like malic acid or aspartic acid which is transported to bundle sheath cells. In bundle sheath cell, it is broken into  and a 3-carbon molecule. The 3-carbon molecule is returned back to mesophyll cells to form PEP. The  molecules released in bundle sheath cells enters the Calvin cycle, where enzyme RuBisCO is present that forms sugar.

I help in production of yield