Maize, also called corn in some countries, is an extensively famous Cereal Grain of the world. Maize is the largest crop in countries like Americas, Canada, Australia and various other Europian countries. Hybrid maize is greatly preferred by farmers over the conventional varieties, because of its high grain yield. While some maize varieties grow 7 metres tall at certain locations, the commercial maize has been bred for a height of 2.5 metres. Sweet maize is generally shorter than the field-maize varieties.