A) Meet the ATP demands of the Calvin Benson cycle.
B) Avoid producing excess \[NADPH+{{H}^{+}}\].
C) Balance ATP and \[NADPH+{{H}^{+}}\] ratios in the chloroplast.
D) All of the above
Correct Answer: D
Solution :
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 is to be speed up to meet ATP needs, an excess of\[NADPH+{{H}^{+}}\] would result. Shifting between cyclic and non- cyclic flow balances \[\operatorname{ATP}/NADPH+{{H}^{+}}\]ratios,
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