Photophosphorylation is the synthesis of ..........

Which process is related to photosynthesis?

Water splitting complex is physically located:

$ATP$ synthesis in chloroplasts and mitochondria is due to a proton gradient across the membrane. Select the correct statements with respect to $ATP$ formation in chloroplasts:
$(a)$ Protons accumulate in the lumen of the thylakoid.
$(b)$ Splitting of water occurs on the inner side of the membrane.
$(c)$ Protons accumulate on the stroma side of the chloroplast.
$(d)$ $NADP$ reductase is located on the stroma side of the membrane.

Where does the release of oxygen occur in the chloroplast?

Which activity is performed by $PS-I$ in light reaction?