AP BIOLOGY

Detailed explanation-1: -The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.

Detailed explanation-2: -Photosynthesis takes place in two distinct stages. In the light reactions, energy from sunlight drives the synthesis of ATP and NADPH, coupled to the formation of O2 from H2O. In the dark reactions, so named because they do not require sunlight, the ATP and NADPH produced by the light reactions drive glucose synthesis.

Detailed explanation-3: -Cell Metabolism During photosynthesis light energy is used to split water, generating O2 and electrons that are then used to produce the ATP and NADPH required for carbon fixation.

Detailed explanation-4: -Summary. The light reactions capture energy from sunlight, which they change to chemical energy that is stored in molecules of NADPH and ATP. The light reactions also release oxygen gas as a waste product.

Detailed explanation-5: -Light energy is used by photosynthetic organisms (photoautotrophs) to produce both ATP and reduced electron carrier (NADPH). ATP, NADPH, and O2 are the three products of photosynthesis’ light reaction.