ATP formation during photosynthesis is known as

Explanation

Photophosphorylation is the correct term for ATP formation during photosynthesis because it specifically refers to the process in which light energy is used to add a phosphate group to ADP, forming ATP. This process occurs in the chloroplasts and is directly driven by light, which excites electrons in the photosystems and creates a proton gradient to power ATP synthase. Dephosphorylation is the removal of a phosphate group from a molecule, which releases energy rather than storing it as ATP. Oxidative phosphorylation occurs in mitochondria during cellular respiration, where electrons from nutrients pass through an electron transport chain to generate ATP using oxygen, not light. Substrate-level phosphorylation involves the direct transfer of a phosphate group from a high-energy substrate molecule to ADP, typically during glycolysis or the Krebs cycle, and does not require light energy. Therefore, only photophosphorylation correctly describes ATP formation in photosynthesis.