Question

to which substance does ferredoxin transfer an electron?
photosystem i
photosystem ii
nadp+
nadph

Explanation:

In the light - dependent reactions of photosynthesis, ferredoxin is an electron carrier. After receiving electrons from photosystem I, ferredoxin transfers electrons to \(NADP^{+}\). The reaction is catalyzed by the enzyme ferredoxin - NADP \(^{+}\) reductase. The equation for this reaction is \(2\) ferredoxin\(_{red}+NADP^{+}+H^{+}\to2\) ferredoxin\(_{ox}+NADPH\). Photosystem I is the source of electrons for ferredoxin (not the recipient). Photosystem II is involved in an earlier part of the electron - transport chain (water splitting and electron transfer to plastoquinone). NADPH is the reduced form of \(NADP^{+}\) and is the product of the electron transfer from ferredoxin to \(NADP^{+}\), not the recipient of electrons from ferredoxin.

Answer:

C. \(NADP^{+}\)