Where do the light reactions take place?

Explanation

The light reactions of photosynthesis occur in the thylakoid membranes of the chloroplasts. During these reactions, light energy is captured by chlorophyll and other pigments, exciting electrons that drive the synthesis of ATP and NADPH. These molecules then provide the energy needed for the Calvin cycle in the stroma. The stroma is not the site of the light reactions but rather where the Calvin cycle, or light-independent reactions, occur. Chloroplasts as a whole are responsible for photosynthesis, but the distinction of regions is crucial for understanding the process. Leucoplasts, on the other hand, do not participate in photosynthesis at all, as they lack photosynthetic pigments.