What are the light and dark reactions of photosynthesis and how are they related?
Light reactions capture solar energy in the thylakoid membranes and synthesize NADPH and ATP. The dark reactions fix CO2 and synthesize sugars in the stroma. Light and dark reactions are related by the fact that both (1) occur in the chloroplast and (2) involve the compounds NADPH and ATP, the light reactions produce them (from NADP+ and ADP) and the dark reactions use them.
