$Z$-scheme in the thylakoid membrane of plants is concerned with:

$DCMU$ ($3$-($3$,$4$-dichlorophenyl)$-1,1-$dimethylurea) is a chemical that acts as an inhibitor of photosynthesis. What is its specific mode of action?

$NADPH$ is generated through:

Ferredoxin contains:

$X -$ In $PS-I$,Chlorophyll $a$ has an absorption peak at $680\, nm$.
$Y -$ In $PS-II$,it has an absorption maximum at $700\, nm$.

In what condition does the Hill reaction occur?