A) reduction in \[C{{O}_{2}}\]
B) activation of chlorophyll
C) photolysis of water
D) all of the above
Correct Answer: C
Solution :
Ruben, Hassid, and Kamen 1941, confirmed that oxygen evolved in photosynthesis comes from water. So the photochemical reaction occurs in this manner. \[\text{4}{{\text{H}}_{\text{2}}}\text{O}\xrightarrow[{}]{\text{Chlorophyll}}\text{4 }\!\![\!\!\text{ O}{{\text{H}}^{\text{-}}}\text{ }\!\!]\!\!\text{ }\] \[\text{4 }\!\![\!\!\text{ O}{{\text{H}}^{\text{-}}}\text{ }\!\!]\!\!\text{ }\xrightarrow[{}]{{}}\text{2}{{\text{H}}_{\text{2}}}\text{O+}{{\text{O}}_{\text{2}}}\text{+}{{\text{4}}_{\text{e}}}\text{-}\] \[\text{4 }\!\![\!\!\text{ }{{\text{H}}^{\text{+}}}\text{ }\!\!]\!\!\text{ +4}{{\text{e}}^{\text{-}}}\text{+2A}\xrightarrow[{}]{{}}\text{2A}{{\text{H}}_{\text{2}}}\] Where A is a hydrogen acceptor.
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