Chloroplasts use sunlight, carbon dioxide, and water to produce nutrients for plant cells and some protist cells through the process of photosynthesis.

Here's a breakdown:

* Sunlight: Provides the energy needed to power the reactions.

* Carbon dioxide: Taken in from the atmosphere and serves as the source of carbon for the sugars produced.

* Water: Absorbed from the soil and provides hydrogen atoms and electrons.

During photosynthesis, chloroplasts convert these inputs into glucose (a sugar) and oxygen. The glucose serves as the primary source of energy and building blocks for the plant or protist cell. Oxygen is released as a byproduct.