What is the function of chloroplasts in a cell?

Chloroplasts are specifically designed for photosynthesis, the process in which they convert sunlight into chemical energy. They contain chlorophyll, the green pigment that captures light energy, and this energy is then utilized to convert carbon dioxide and water into glucose and oxygen. The glucose produced serves as an energy source for the plant, allowing it to grow and perform other vital functions. This process is fundamental to the survival of plants and forms the basis of the food chain, as plants are primary producers.

Other functions such as breaking down waste or repairing cellular damage are not related to the role of chloroplasts and are instead performed by different organelles within the cell. For instance, lysosomes are responsible for waste breakdown, while other cellular mechanisms handle repair processes. Thus, the correct option highlights the essential role of chloroplasts in energy conversion and sustenance of plant life.