Barley (Hordeum vulgare), cereal plant of the grass family Poaceae and its edible grain. Grown in a variety of environments, barley is the fourth largest grain crop globally, after wheat, rice, and corn.

Corn, (Zea mays), also called Indian corn or maize, cereal plant of the grass family (Poaceae) and its edible grain. The domesticated crop originated in the Americas and is one of the most widely distributed of the world’s food crops.

Rice, which is significant for more than half of the world population’s nutrition, is obtained by processing the paddy product after threshing.

Wheat, any of several species of cereal grasses of the genus Triticum (family Poaceae) and their edible grains.