Which of the following is responsible for the production of $NADPH$?

Pigment system-$II$ ($PS$-$II$) is concerned with:

In noncyclic photophosphorylation,the pigment molecule first excited is

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 $ATP$

Explain: Non-cyclic Photophosphorylation.

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