It is believed that the ratio of cyclic electron transport to Z-scheme photosynthesis changes in response to metabolic demands. If a plant were actively engaged in a large amount of reductive biosynthesis, requiring NADPH, how would it alter these processes compared to a plant just performing the Calvin cycle to produce glucose?
A) More cyclic photophosphorylation, less Z-scheme.
B) More Z-scheme photosynthesis, less cyclic photophosphorylation.
C) No significant difference.
D) Impossible to predict from the information provided.

Question

Quizplus · Accepted Answer

The Z-scheme of photosynthesis generates both ATP and NADPH, which are required for reductive biosynthesis. If a plant needs more NADPH for such processes, it would increase Z-scheme photosynthesis relative to cyclic photophosphorylation, which primarily produces ATP without the production of NADPH.

It Is Believed That the Ratio of Cyclic Electron Transport