Question

Cyclic photophosphorylation results in the formation of
A. ATP
B. NADPH
C. ATP and NADPH
D. ATP, NADPH and $\mathop O\nolimits_2$

Answer 1

Cyclic photophosphorylation, also known as photosystem-1 (PS-1) is nearly involved in which electron produced moves in a cyclic pathway and is involved in different conversations. ATP is synthesised by this process and photolysis of water is involved.

Complete answer:
Cyclic photophosphorylation is defined as the process of synthesis and production of ATP coupled with electron transport chain which is activated by the photosystem-1 (PS-I) with long wavelength light that is 700 nm.
This process is not controlled by any components of PS-II like some of the inhibitors present in PS-ll that is, CMU, DCMU and orthophenanthroline.
In this process chlorophyll 'a' which is light activated is helpful to reduce an acceptor and then the electron transport chain brings down the electrochemical gradient with the help of electron carriers to the oxidizing site of PS-I. ATP production is accomplished with this electron transport chain. ADP gets transferred into ATP in this cycle. In cyclic photophosphorylation, the electrons occur in the electron transport chain that are transferred and carried back to P700 or chlorophyll 'a' rather than going into the NADP from the electron acceptor.
Thus, we can conclude and find out that in the Cyclic photophosphorylation process only ATP will be formed, as electrons do not pass out to NADP so NADPH and O2 is not produced.
Thus, we can conclude that the Cyclic photophosphorylation process will give rise only to ATP not NADPH and $\mathop O\nolimits_2$.

Hence, the correct answer is option (A)

Note: Plants undergo and complete two processes that are cyclic photophosphorylation and non-cyclic photophosphorylation. In cyclic photophosphorylation only ATP are produced and in non-cyclic phosphorylation leads to formation of ATP, NADPH and $\mathop O\nolimits_2$