Which of the following is useful for the $Ex-situ$ conservation of plants?

Which of the following taxonomical aids is being described by the given statements $(i-iv)$?
$(i)$. They are generally established in educational institutes.
$(ii)$. They have collections of preserved plant and animal specimens for study and reference.
$(iii)$. Insects are preserved in boxes after collecting,killing,and pinning.
$(iv)$. They often have collections of skeletons of animals too.

Match the following columns correctly:

Column $I$ (Location)	Column $II$ (Botanical Garden)	Column $III$ (Herbarium/Institution)
$i.$ Kolkata	$a.$ Lloyd Botanical Garden	$p.$ British Museum of Royal Botanical Garden
$ii.$ Kew	$b.$ Indian Botanical Garden	$q.$ Herbarium of Forest Research
	$c.$ Royal Botanical Garden	$r.$ Central National Herbarium

Assertion $A$: In a herbarium,plant specimens are preserved and protected.
Reason $R$: Processes like poisoning and fumigation are performed on plant specimens.
Which option is correct for Assertion $A$ and Reason $R$?

Which types of plants are grown in botanical gardens?

What is collected in museums for study and reference?