AP BIOLOGY

Detailed explanation-1: -During Light reactions of Photosynthesis, the chlorophyll will be activated by light. This light activated chlorophyll will split the water molecule. This process is called Photolysis. Water molecule is split to release H+ ions and also oxygen.

Detailed explanation-2: -In photosynthesis, a light-dependent reaction uses light energy from the sun to split water which has been taken in by the organism. Water, when split, gives oxygen, hydrogen, and electrons. These electrons move through structures in chloroplasts and, by chemiosmosis, make ATP.

Detailed explanation-3: -Photosystem 2 (PS2) is the part of the photosynthetic apparatus that uses light energy to split water releasing oxygen, protons and electrons.

Detailed explanation-4: -The primary purpose of splitting water in the light dependent reactions of photosynthesis is to produce electrons for the electron transport chain. The electrons are passed to photosystem 2 where they were undergo various redox reactions.

Detailed explanation-5: -That replacement process also requires light, working with an enzyme complex to split water molecules. In this process of photolysis (“splitting by light”), H2O molecules are broken into hydrogen ions, electrons, and oxygen atoms. The electrons replace those originally lost from chlorophyll.