Question

In non-cyclic photophosphorylation PS- I is reduced by

• A. Electrons from ferredoxin
• B. Electrons from PS- II
• C. Hydrogens from PS- II
• D. Hydrogens from water

Answer 1

Answer: (B)

Electrons from PS- II

Z scheme of light reaction is a noncyclic flow of the electron from PSII through electron transport chain to NADPH via PSI. Plastocyanin is electron carrier copper containing soluble metalloprotein protein that serves to carry electron between two photosystems of photosynthesis. It takes the electron from plastoquinol which is reduced by PS II and carries them to PSI. Electrons from PSII reduce PSI. Thus, the correct answer is option B.