If you add a compound to illuminated chloroplasts that inhibits the NADP⁺ reductase, NADPH generation ceases, as expected.However, ferredoxin does not accumulate in the reduced form because it is able to donate its electrons not only to NADP⁺ (via NADP⁺ reductase) but also back to the cytochrome b₆-f complex.Thus, in the presence of the compound, a "cyclic" form of photosynthesis occurs in which electrons flow in a circle from ferredoxin, to the cytochrome b₆-f complex, to plastocyanin, to photosystem I, to ferredoxin.What will happen if you now also inhibit photosystem II?

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The Answer of If you add a compound to illuminated chloroplasts that inhibits the NADP⁺ reductase, NADPH generation ceases, as expected.However, ferredoxin does not accumulate in the reduced form because it is able to donate its electrons not only to NADP⁺ (via NADP⁺ reductase) but also back to the cytochrome b₆-f complex.Thus, in the presence of the compound, a "cyclic" form of photosynthesis occurs in which electrons flow in a circle from ferredoxin, to the cytochrome b₆-f complex, to plastocyanin, to photosystem I, to ferredoxin.What will happen if you now also inhibit photosystem II?

If You Add a Compound to Illuminated Chloroplasts That Inhibits