Question

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

• A. NADPH → O2 → CO2
• B. H2O → NADPH → Calvin cycle
• C. NADPH → chlorophyll → Calvin cycle
• D. H2O → photosystem I → photosystem II

Answer 1

The correct option is B

H2O → NADPH → 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.