it means to tame it so you can plant it where you won't it
Nearly every crop in commercial production could be considered domesticated if by domesticated you mean bred for a specific purpose or to enhance a particular trait such as higher yield, drought tolerance or disease resistance.
They domesticated such crop, some 3000 years ago.
maize, that simple
Corn or maize.
Wheat is the first cereal to be cultivated by man.
domesticated means that an animals is kept in captivity
Turnip is a root crop or root vegetable that grows in tropic or polar regions. The crop was domesticated in India before 5th century BC.
There is no such thing as a "crash crop."
Besides the fact that maize (corn) was first domesticated in Mexico almost 3000 years ago, it is also a profitable crop, at least when compared against other cereals such as wheat and rice.
Food crop is something that is grown, for example corn.
Crop variety is the different crops that are grown in an area.
Millet was domesticated from wild species in more northerly subhumid regions of east Asia. It is a type of grass grown as a cereal crop, used both as food and animal feed.