Thank you for reporting, we will resolve it shortly
Q.
$ {{O}_{2}} $ released in the process of photosynthesis, comes from:
Bihar CECEBihar CECE 2004
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.