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Q.
During light reaction of photosynthesis the electrons lost by pigment system II are compensated by
NTA AbhyasNTA Abhyas 2020
Solution:
The photo-oxidation of water is the light-dependent splitting of the water molecule into hydrogen and oxygen that occurs during the light reaction of photosynthesis. It is also called photolysis of water. The photolysis of water occurs in the water-splitting complex, which is embedded on the inner side of thylakoid membranes of chloroplasts. The water-splitting complex is associated with photosystem II.
The water is split into H+, [O], and electrons
$2H_{2}O\overset{L i g h t}{ \rightarrow }4H^{+}+4e^{-}+O_{2}$
Thus, the breakdown of two molecules of water releases a molecule of O2 along with 4H+ and four electrons (4e-). The electrons released from water is immediately accepted by the oxidized reaction center of PS II (P680). This process occurs during the light reaction of photosynthesis.
The O2 evolving complex requires manganese and chloride and calcium. The oxygen which is released during the photolysis of water is the only major source of oxygen in the earth's atmosphere.