Some grasses are important crops in agriculture. Rye (RYES) and cereals (CEREALS) are two examples of grasses that are widely cultivated for their edible grains. Rye is a cereal grain that is used to make bread, beer, and whiskey. Cereals are grains that are eaten as breakfast foods, such as oatmeal, corn flakes, and wheat flakes. Both rye and cereals are important sources of nutrition for humans.