During the course of photosynthesis,

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:

In photosystem $II$,the reaction center chlorophyll $a$ absorbs $680 \, nm$ wavelength of ...... causing electrons to become excited and jump into an orbit.

During photosynthesis,the photo-oxidation of water is associated with .........

Which photosystem is inactive in the red drop effect?

Cyclic photophosphorylation results only in the