Final answer:
Chloroplasts capture light energy and synthesize food for the plant through photosynthesis.
Step-by-step explanation:
Chloroplasts are organelles found in plant cells that capture light energy from the sun and use it, along with water and carbon dioxide, to synthesize food (sugar) for the plant through a process called photosynthesis. They contain a green pigment called chlorophyll, which absorbs the light energy needed for photosynthesis. This energy is then used to convert carbon dioxide and water into glucose, the plant's source of energy. Chloroplasts are responsible for the green color of plants and are crucial for their survival.