Question

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

• A. NADP${}^{+}$$\to$ O${}_2$ $\to$ CO${}_2$
• B. H${}_2$O $\to$ NADP${}^{+}$ $\to$ Calvin cycle
• C. NADP${}^{+}$ $\to$ chlorophyll $\to$ Calvin cycle
• D. H${}_2$O $\to$ photosystem I $\to$ photosystem II

Answer 1

The correct option is B

H${}_2$O $\to$ NADP${}^{+}$ $\to$ Calvin cycle

Electrons flow from water through the photosystem II, electron transport chain, and photosystem I to NADP${}^{+}$. The electrons of NADPH thus formed are then used in the Calvin cycle.