Chloroplasts are important because they are the sites where photosynthesis occurs. Photosynthesis is the process in which chemical energy is obtained by converting solar energy.
Chloroplasts contain chlorophyll. This is a green pigment that absorbs light energy from the sun for photosynthesis. Photosynthesis occurs in two stages, the light reaction stage and the dark reaction stage. The chemical energy produced from this process is stored as sugar. Chloroplasts are plastids that develop in the cells of plant leaves. Plastids assist in the process of storing and later harvesting needed substances to produce energy. Chloroplasts contain the following structures: membrane envelope, thylakoid membrane, grana, stroma and chlorophyll.