Where is the label placed on a herbarium sheet?

What is the mechanism that provides taxonomical information?

Which of the following is $NOT$ included in a botanical museum?

$S$ Statement: In herbaria,plant specimens are preserved using specific methods.
$R$ Reason: $A$ herbarium is a storehouse of plant specimens collected from various locations.
$(a)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.

Which one of the following is not a correct statement?

What is a monograph?