The organelle that uses energy from the sun to produce food is the chloroplast.

Chloroplasts are found in plant cells and some algae. They contain chlorophyll, a green pigment that absorbs sunlight. This sunlight energy is used to convert carbon dioxide and water into glucose (a sugar) and oxygen, a process called photosynthesis.

Here's a simple breakdown:

* Sunlight + Carbon Dioxide + Water → Glucose + Oxygen

This glucose is the food that the plant uses for energy and growth.