Plants go through the trouble of using the ATP to make glucose because it provides it with nourishment and is used in the production of cellulose.
This is referred as a simple sugar and a monosaccharide. it has a sweet taste and is readily absorbed in cells to provide energy.
Plants make ATP in a limited manner and the production of Glucose from it ensures the cells are adequately nourished and the production of cellulose is maximized.
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