Question

Which of the following is not involved during cyclic photophosphorylation?

• A. Fd
• B. FNR
• C. PQ
• D. PC

Answer 1

The correct option is B FNR

When light of wavelength 700nm falls on PS I, an electron is expelled. The expelled electron passes onto a series of electron carriers which include modified chlorophyll molecule $A_0$, $A_1$, Fe-S centres, ferredoxin (Fd), plastoquinone (PQ), cytochrome $b_{6}f$and plastocyanin (PC) before returning back to the photocentre. This process continues in a cyclic manner.

FNR or ferredoxin NADP reductase is not involved in this process and there is no generation of NADPH. Only ATP is synthesised.