In cyclic photophosphorylation,which one of the following is formed?

What are the full names of the following abbreviations used in photosynthesis?
$(1)$ $PS-I$
$(2)$ $PS-II$

Photolysis of water takes place in

In photosynthesis,energy from the light reaction to the dark reaction is transferred in the form of:

Identify the correct statements regarding chemiosmotic hypothesis :
$(a)$ Splitting of the water molecule takes place on the inner side of the membrane.
$(b)$ Protons accumulate within the lumen of the thylakoids.
$(c)$ Primary acceptor of electron transfers the electrons to an electron carrier.
$(d)$ $NADP$ reductase enzyme is located on the stroma side of the membrane.
$(e)$ Protons increase in number in stroma.
Choose the correct answer from the options given below:

The primary electron acceptor for the electron released by $P_{680}$ in the light reaction is ......... .