Question

In the diagram given below what is label $A,B$ and $C$. What type of phosphorylation is possible in this?

Answer 1

Introduction :

The above diagram represents cyclic photophosphorylation as only photosystem I is functional and results in the production of $ATP$. It takes place in the stroma lamellae when only light of wavelengths beyond $680$ nm are available for excitation.

Label -A :

The part labelled $A$ in the diagram is electron acceptor.
This electron acceptor accepts the electron from excited $PS700$

Label - B :

The part labelled $B$ in the diagram is Electron transport system.
The part labelled $C$ in the diagram is Chlorophyll $P700$.

Summary :

Cyclic photophosphorylation