Where do the light dependent reactions occur?

The light-dependent reactions of photosynthesis occur in the thylakoid membranes of the chloroplasts. During these reactions, chlorophyll absorbs sunlight, which energizes electrons and initiates a series of processes that produce ATP and NADPH, as well as oxygen as a byproduct. These reactions are essential for converting light energy into chemical energy that will be used in the subsequent light-independent reactions.