Question

In electron transport system, the last electron acceptor of photo-phosphorylation is

• A. ${\text{NADP}}^{+}$
• B. $\text{NADPH}$
• C. Chlorophyll a
• D. Atomic oxygen

Answer 1

The correct option is A ${\text{NADP}}^{+}$

Non-cyclic photo-phosphorylation

During non-cyclic photo-phosphorylation, both ATP and NADPH are synthesised. This process usually occurs when light of wavelength of 680 nm is available.

The electrons from PS II reach PS I. The electrons passes through a series of carriers and reaches FNR.

FNR is ferredoxin-${\text{NADP}}^{+}$ oxidoreductase, an enzyme that catalyses the reaction in which there is transfer of electrons from ferredoxin (Fd) to ${\text{NADP}}^{+}$. This results in the formation of NADPH.

Thus the last electron acceptor of photo-phosphorylation is ${\text{NADP}}^{+}$.

Final answer
(B) ${\text{NADP}}^{+}$