What is the primary function of chloroplasts in leaf cells?

The primary function of chloroplasts in leaf cells is photosynthesis. Chloroplasts contain chlorophyll, the green pigment that captures sunlight, enabling plants to convert light energy into chemical energy. This process combines carbon dioxide from the atmosphere with water absorbed by the roots, producing glucose and oxygen as byproducts. The glucose serves as an energy source for the plant, while oxygen is released into the environment.

In contrast, water storage is typically managed by vacuoles, and respiration, which occurs in the mitochondria, is a different process altogether, focusing on converting glucose into usable energy. Nutrient absorption primarily takes place at the root level, where roots take in water and minerals, but it is not a function of chloroplasts. Hence, photosynthesis is the fundamental role of chloroplasts, making it the correct answer.