Each statement in the key is called

What information do herbaria provide?

What is housed in a museum for biological specimens?

Statement $P$: $A$ herbarium is a storehouse of plant specimens collected from various places.
Statement $Q$: There are specific methods for preserving plant specimens in herbaria.

What is done to plant specimens before they are stored in steel or wooden cabinets in a herbarium?

Which of the following is the utility of a herbarium?