Because corn is a cereal crop just like barley, wheat, rye, and triticale, since it is a grass plant which is capable of sexual reproduction which produces seeds much like any other grass plant species that exists on Earth. These seeds are harvested and compiled together as grain. The seeds are called kernels. Corn is a plant that has been artificially selected over many many breedings to produce kernels that are larger than any other grass seed and stay on the cob much longer than any other native grass species, relying on humans to harvest and disperse the seeds and not Nature. Hence, corn was made into a grain.
Farmers get the majority of their seeds from crop breeders who specialize in producing seeds to grow the plants that farmers grow to sell their crops with. The seeds that farmers keep from the crop they sow often won't be suitable enough to grow again, especially with crop varieties like corn, wheat and canola.
a hybrid crop is like corn or maybe even like soybeans.
A cornfield. It has "ears" in the sense of the part of a crop plant that contains the seeds, but it cannot hear like human ears can.
Well, genetically, yes. But technically, no. Corn is still a grass plant that has been bred and selected from the original native Mexican grass plant Teosinte, to have larger seeds, a husk surrounding those seeds on a cob, a more upright plant for easier harvesting, and to make the seeds unshatterable for easier harvesting, among other reasons. Humans cannot make plants like Mother Nature can, so, in a way, corn is and isn't man-made.
The crop provides food, and like cotton, clothing. Also, corn husks can be used for making dolls, called corn husk dolls, obviously.
Corn is actually a grass and is a monocotyledonous plant. The corn kernals are the seeds of the plant.
Corn evolved from a type of grass in Mexico. It looked nothing like the corn we know today, but instead like tall grass. Natives found that the seeds of the plant were edible, though small and not particularly good. Selective breeding and selection has gradually shifted it into the corn we know today. These breeding programs continue to improve this grass even today, with researchers modifying the genome directly in some cases. http://www.seedsofchange.com/enewsletter/issue_43/corn.asp
They like to eat small grass seeds or chicken seeds.
No. While the two plants may appear similar from a distance, they are two different species. Cow corn (usually called "field corn" or "dent corn") has its seed on an ear that is partway up the plant, just like sweet corn on the cob. Sorghum is another member of the grass family like corn, but has its seeds in a "spray" or inflorescence at the top of the plant where corn would have only its tassel.
Not directly. But many farmers interseed (plant amongst) a hay crop along with a grass crop like wheat or oats. The grass cover crop helps protect the hay crop while it is very young and prone to damage. When the grass crop is mature enough, the farmer harvests it and leaves the hay crop to grow on its own.
Corn is a grain, as it comes from a grass plant just like wheat.