Question

Following steps in random order are given below for photophosphorylation through chemiosmosis –

I. ATP synthase produces ATP due to flow of H⁺ from thylakoid lumen to stroma

II. NADP reductase, located on stroma side of membrane, obtains e^- from PSI and protons from stroma to form NADPH₂

III. Cytochrome system (b & f) transport electrons and pumps H+ from stroma to thylakoid space

IV. PSII oxidizes water

V. Reaction centre of PSII gets photoexcited having released electrons.

The correct sequences is -

• A. I, II, III, IV, V
• B. V, IV, III, II, I
• C. I, III, II, IV, V
• D. III, V, IV, II, I

Answer 1

Answer: (B)

V, IV, III, II, I