Final answer:
Chloroplasts are the organelles in plant cells that capture energy from sunlight to produce food through the process of photosynthesis, containing chlorophyll within their thylakoid structures.
Step-by-step explanation:
The organelles that capture energy from sunlight and use it to produce food for the cell are called chloroplasts. Chloroplasts are specialized structures within cells that facilitate the process of photosynthesis. They contain a pigment known as chlorophyll, which absorbs the sunlight, allowing the chloroplast to use light energy along with water and carbon dioxide to synthesize sugars. These sugars serve as food and energy sources for the plant. Furthermore, the structure of chloroplasts comprises an outer and an inner phospholipid membrane, with an intermembrane space between them. The internal fluid is called the stroma, where enzymes for the photosynthesis reactions are located. Within the stroma are thylakoids, organized in stacks called grana, which are the primary sites for light-dependent reactions of photosynthesis.