A) \[C{{O}_{2}}\]
B) water
C) sugar
D) pyruvic acid
Correct Answer: B
Solution :
Ruben, Kamen and Hassid (1941) proposed that \[{{O}_{2}}\] evolved during photosynthesis comes from water. The \[{{O}_{2}}\] is actually released during photolysis of water in PS-II of light reaction as: \[4\,{{H}_{2}}O\overset{Mn\,_{}^{+}C{{l}^{-}}}{\mathop{\rightleftharpoons }}\,\,4\,O{{H}^{-}}+4\,{{H}^{+}}\] \[4\,O{{H}^{-}}\rightleftharpoons \,2\,{{H}_{2}}O+{{O}_{2}}+4\,{{e}^{-}}\] Calvin (1954-55) traced the pathway of carbon fixation by using \[{{(}^{14}}C{{O}_{2}})\] and gave the \[{{C}_{3}}\] cycle. During dark reaction of photosynthesis assimilation of \[C{{O}_{2}}\] takes place to form carbohydrate. In the process of glycolysis (common path of aerobic and anaerobic respiration) the glucose molecule breaks down into two molecules of pyruvic acid.
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