When the two pigment systems absorb light,in what direction does the energy flow between them?

The high energy of electrons is used during the synthesis of .........

The reaction centres for $PS-I$ and $PS-II$ are

The following $(I-VI)$ are the main steps of chemiosmotic $ATP$ synthesis in the light reaction. Arrange them in the correct order:
$I$. $H^+$ concentration gradient established
$II$. $H^+$ diffuses through $ATP$ synthase
$III$. Carriers use energy from electrons to move $H^+$ across the membrane
$IV$. Electrons from $PS-II$ pass along the electron transport chain
$V$. Light excites electrons in $PS-II$
$VI$. Energy of $H^+$ flow is used by $ATP$ synthase to make $ATP$

The $ATP$ase enzyme consists of
$I$. $F_{0}$
$II$. $F_{1}$
$III$. $F_{2}$
Select the correct option.

Describe the photolysis of water.