A) Meet the ATP demands of the Calvin Benson cycle.
B) Avoid producing excess\[NADPH+{{H}^{+}}\].
C) Balance ATP and \[NADPH+{{K}^{+}}\] ratios in the chloroplast.
D) AIl of the above
Correct Answer: D
Solution :
[d] ATP is required at higher levels in the Calvin-Benson cycle than \[NADPH+{{H}^{+}}.\]Therefore, there must be a mechanism for producing additional ATP. Cyclic electron flow provides that mechanism. If non cyclic electron flow were to be speed up to meet ATP needs, an excess of \[NADPH+{{H}^{+}}.\] would result. Shifting between cyclic and noncyclic flow balances ATP/NADPH + H+ ratios.
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