The trapping centre of light energy in photosystem-$I$ is

During non-cyclic photophosphorylation,which of the following does the electron produced through photolysis enter?

$PS-I$ in cyclic photophosphorylation is involved in the formation of ...$A$... by ...$B$... movement of electrons. What do $A$ and $B$ refer to here?

Photophosphorylation means synthesis of

Photosystem-$II$ is found in .........

Chemiosmosis requires:
$I$. $A$ membrane
$II$. $A$ proton pump
$III$. $A$ proton gradient
Select the correct option.