The sun's energy is stored in the process of photosynthesis in the form of chemical energy within the bonds of glucose molecules.

Here's a breakdown:

1. Light-Dependent Reactions: Sunlight is absorbed by chlorophyll in chloroplasts, converting light energy into chemical energy in the form of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).

2. Light-Independent Reactions (Calvin Cycle): The ATP and NADPH from the light-dependent reactions are used to power the Calvin cycle. This cycle uses carbon dioxide from the atmosphere to create glucose (a sugar). The chemical bonds within the glucose molecule store the energy from the sun.

So, while the sun's energy initially exists as light energy, it is transformed into chemical energy and stored within the glucose molecules produced during photosynthesis. This stored chemical energy is then used by the plant and other organisms for growth, development, and various metabolic processes.