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Photosynthesis can be divided into two stagesâthe light dependent reaction and the light independent (or dark) reactions. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released.
Meanwhile, ATP is also formed. Therefore, these light reactions release oxygen as a waste product of photosynthesis, while ATP and NADPH are essential to the next step in photosynthesis, the dark reactions.To unlock this lesson you must be a Study.com Member.hese reactions use photolysis, or the use of light energy to split water molecules and produce oxygen. In these light-dependent reactions, light energy is absorbed by chlorophyll and other pigments and transferred to the reaction center of photosystem II.