Final answer:
During the Calvin cycle, glucose molecules are stored as energy in plants. They are converted into starch or glycogen and broken down into glucose when energy is needed.
Step-by-step explanation:
The glucose molecules produced during the Calvin cycle in plants are stored as energy. They are converted into starch or glycogen, which are energy-storing polymers.
When energy is needed, these polymers are broken down into glucose to generate ATP molecules for cellular processes.