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Grain is not a food group, grains belong to a food group - the "carbohydrates".
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PROTEIN
THE GRAINS GROUP, SILLY!
Breads and grains.
Grains
They will drink, mothers milk or water, eat hay, grass and grains.
The colour for a plant cell's starch grains is typically blue or black when stained with iodine solution. This is due to the formation of a complex between iodine and starch, which results in the characteristic colour change.
Technically it's a grain but it's mostly used as a vegetable.