AP BIOLOGY

Detailed explanation-1: -Splitting of H2O molecules into hydrogen ions and oxygen in the presence of light and grana is photolysis . The photolysis reaction is carried out by the photosystem II which is present in the membrane of thylakoids.

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

Detailed explanation-3: -Chlorophyll is therefore said to “donate” an electron (Figure 5.12). To replace the electron in the chlorophyll, a molecule of water is split. This splitting releases an electron and results in the formation of oxygen (O2) and hydrogen ions (H+) in the thylakoid space.

Detailed explanation-4: -In water electrolysis, the source of energy used for the reaction to occur is electricity. An easy way to generate electricity is with a battery. Because pure water is not good at conducting electricity, however, electrolysis requires the addition of an electrolyte, such as salt or acid.