AP BIOLOGY

Detailed explanation-1: -Ultimately, the electrons that are transferred by Photosystem I are used to produce the moderate-energy hydrogen carrier NADPH. The photon energy absorbed by Photosystem I also produces a proton-motive force that is used to generate ATP.

Detailed explanation-2: -ATP is the product of photosystem I.

Detailed explanation-3: -Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP.

Detailed explanation-4: -The light reactions of photosystems I and II (PSI and PSII) result in the formation of an electrochemical transmembrane proton gradient that is used for the production of ATP.

Detailed explanation-5: -The chloroplasts present in the plants also use NADPH as a part of the pathway to synthesize sugars from the sunlight and also from the carbon dioxide. Likewise, in other reactions, NADPH carries electrons and protons into the new carbon-carbon bonds, creating sugar molecules.