Here's why:

* Dark Reactions (Calvin Cycle): These reactions occur in the stroma of chloroplasts and use the energy stored in ATP and NADPH (produced during the light-dependent reactions) to convert carbon dioxide into glucose.

* Glucose: This six-carbon sugar is the main form of chemical energy produced by photosynthesis. It serves as a source of energy for plants and other organisms that consume them.

Let me know if you'd like more details about the Calvin Cycle or the process of photosynthesis!