There are mainly eight types of food grains consumed by modern human society, namely barley, wheat, maize, millet, sorghum, mustard, oat and rice. These plants were present in the form of weeds in different areas, which were later grown as seeds by human beings at different places, in different times. Although, barley was the first grain to be cultivated by human beings during 8000 B.C. in western Asian countries located between the northeast Mediterranean Sea and Iran. Later, in the same area, wheat was also cultivated around 8000 B.C.