Question

Cyclic photophosphorylation results in the formation of.
A. ATP
B. NADPH
C. ATP and NADPH
D. ATP, NADPH, and $O_2$

Answer 1

Plant produces food via the photosynthesis process which takes place in the chloroplast of the cell and it takes place in two-phase of the cycle. The light reaction and dark reaction both take place in a different part of the chloroplast cell that is named as thylakoid membrane and stroma respectively.

Complete answer: In light reaction, radiant energy converted into chemical energy as ATP and NADPH, in which the addition of phosphate molecules takes place in the presence of light which is called photophosphorylation. In photophosphorylation, ADP is converted into ATP which is an energy-rich compound and it is of two types such as cyclic photophosphorylation and non-cyclic photophosphorylation. In the case of a cyclic reaction, the movement of electrons for the formation of ATP molecules has occurred cyclically. That takes place in the thylakoid membrane and uses photosystem I and chlorophyll P700, in which electron is transferred back to P700 which shows the downward movement of electron and the form ATP. While in the case of non-cyclic photophosphorylation that takes place in stroma, the electron is a move-in non-cyclic manner for the formation of ATP using electrons comes from photosystem II that is called non-cyclic photophosphorylation. In which $NADPH_2$ and ATP molecules are formed and P680 is an active reaction centre. The oxygen is evolved as a byproduct.
Hence the correct option is A.

Note: The cyclic phosphorylation is occur in a cyclic way as the name suggests however, the other non-cyclic phosphorylation is considered as Z-scheme as it occurs in the chloroplast in as Z-shape manner, not in a cyclic way.