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Dried wheat is called straw, but technically 'straw' can be any dried cereal grain.
Dried Wheat Stalks are called 'straw'
Fodder
Threshing is a term used in the process of refining grain. In the Bible people had "threshing floors" The wheat or other grain had to be separated from the stalks. This was done by beating (Threshing) the grain stalks until the grain fell free.
A threshing machine.
Straw or perhaps chaff.
Yes.
in Quebec or in a Hispanic shop
No, it doesn't. It is a cereal grain and grows in stalks.
Hay is dried grass or legumes (like alfalfa). Straw is the dried stalks of harvested cereals, such as wheat, barley, and oats.
Sheaf may be the term you're looking for. Sheaves of grain are bundles of grain before threshing.