What do grades mean in relation to grains such as wheat and barley?

Answer 1

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If grains such as wheat and barley don't get good grades in school they will wind up in a generic loaf of bread rather than a brand name such as Wonder. That is why grades are not only important for humans, but grains as well.
(If a grain gets very poor grades it may not be able to even get a job in a generic loaf of bread and remain unemployed or even worse, wind up as filler material in dog food)

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Asker's Comment:

I was expecting the answer to be more specific and I don't feel like my question was completely answered but then again, my question was broad.