The light reactions of photosynthesis are said to be similar to a battery because they form a current. In which direction do the electrons of this circuit flow? A) H ₂O → PSII → electron transport chain → PSI → electron transport chain → NADPH B) H ₂O → PSII → chlorophyll b → PSI → chlorophyll a → NADPH C) NADPH → PSII → electron transport chain → PSI → electron transport chain → NADP ⁺ D) NADP ⁺ → PSII → electron transport chain → PSI → electron transport chain → NADPH E) PSI → electron transport chain → PSII → electron transport chain → NADPH

Question

Quizplus · Accepted Answer

The correct flow of electrons in the light reactions of photosynthesis starts from water (H2O), goes through Photosystem II (PSII), then through the electron transport chain to Photosystem I (PSI), through another segment of the electron transport chain, and finally to NADPH. This sequence correctly represents the Z-scheme of electron flow in the light-dependent reactions of photosynthesis.

The Light Reactions of Photosynthesis Are Said to Be Similar