How many cyclic and non-cyclic photo-phosphorylation is required to produce one molecule of glucose?
In non-cyclic photophosphorylation the stoichiometry of ATP:NADPH is predicted as 3:2, i.e, for every two NADPH formed, a total of three ATP are produced.
Source: Cyclic, pseudocyclic and noncyclic photophosphorylation: New links in
the chain. John F. Allen. TRENDS in Plant Science Vol.8 No.1 January 2003.
Cyclic photophosporylation, does not occur under normal conditions in higher plants. It is believed to occur only when either light intensity is low (lower frequency so as only PS1 can function) or when carbon fixation is not at par with light irradiance (i.e, too much light).
And hence it is not advisable to come to this generalization &quot;Six Turns of non cyclic photophosphorylation will produce 12 NADPH2 and six ATP molecule&quot;