C4 plant

C4 plant- a plant that utilizes the C4 carbon fixation pathway in which the CO₂ is first bound to a phospoenolpyruvate in mesophyll cell resulting in the formation of a four carbon compound that is shuttled to the bundle sheath cell where it will be decarboxylated to liberate the CO₂ to be utilized in the C3 pathway.  Corn is a C4 plant because it does what is listed above as well as being grown in areas where C3 plants wouldn't grow well.