Explanation

The leaves of $C_{4}$-plants have Kranz anatomy. In the leaf, vascular bundle is surrounded by bundle sheath and mesophyll cells. The bundle sheath consists of thick walled cylindrical cell. The chloroplasts of bundle sheath are larger than mesophyll cells. Most of the PEP carboxylase occurs in mesophyll cells, while most of ribulose 1-5 diphosphate carboxylase and malic enzyme in bundle sheath cells.