Fates of glucose in plants

Plants use the glucose made by photosynthesis in several ways. Some is used to release energy, some is stored, and some is used to build other substances needed by the plant.

Glucose for energy and storage

In respiration, plant cells break down glucose to release energy for cellular processes.

Glucose can also be converted into starch for storage. Starch is insoluble, so it does not dissolve in the water inside cells. Plants can also convert glucose into fats and oils, which act as energy stores.

Glucose for building substances

Plants use glucose to make cellulose, which strengthens their cell walls.

Glucose is also used to produce amino acids, which are joined together to make proteins. To make amino acids and proteins, plants need nitrogen. They obtain it from nitrate ions absorbed from the soil through their roots.