Where are plants of medicinal,rare,and economic importance cultivated?

Which one of the following is not a correct statement?

$A:$ Botanical gardens are an $ex-situ$ conservation strategy for plants.
$R:$ The National Botanical Garden is situated at Howrah.

Identify the incorrect statement regarding botanical gardens.

How are specimens arranged in herbaria?

According to the classification of zoological parks,which area is considered non-directed?