Question

In electron transport system, the last electron acceptor of photophosphorylation is

• A. $NADPH$
• B. $NAD{P}^{+}$
• C. Atomic oxygen
• D. Chlorophyll a

Answer 1

The correct option is B $NAD{P}^{+}$

In electron transport process the excited electron from P${}_6$${}_8$${}_0$ is accepted by primary acceptor quinone, which sends them to an electron transport system consisting of plastoquinone, cytochrome complex and plastocyanin.

The excited electron absorbed by P${}_7$${}_0$${}_0$ reaction centre, then transfer to the ferredoxin (Fe), then the reduced Ferredoxin donates the electron to NADP${}^{+}$.

The NADP${}^{+}$ takes electron from ferredoxin, protons from the medium and get reduced to NADPH in presence of enzyme ferredoxin- NADP- reductase.

Hence, the correct answer is 'NADP${}^{+}$'.