Glucose is the energy source of plants, but it can also be converted into other substances, the most important of which is cellulose, a substance used to make cell walls. The other is starch, which can be used as energy storage for plant seeds.

Once plants synthesize glucose in photosynthesis, they must move everywhere. Before that, glucose was often converted into sucrose, called sucrase, which was transmitted to various places through phloem pipes. This is a transfer. Unlike evaporation, it can move in many directions.