Which of the following places is used to keep wild animals in a protected environment under human care?

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

Find the correct sequence of various steps of herbarium technique:
$a.$ Drying $b.$ Poisoning
$c.$ Collection $d.$ Labelling
$e.$ Mounting $f.$ Deposition
$g.$ Stitching

Match the following columns correctly:

Column-$I$	Column-$II$
$(1)$ Central National Herbarium	$(a)$ Vadodara
$(2)$ Herbarium Department of Botany	$(b)$ Paris
$(3)$ Herbarium of Forest Research	$(c)$ Kolkata
$(4)$ Museum of National History	$(d)$ Dehradun

The contrasting characteristics generally in a pair used for identification of animals in a Taxonomic Key are referred to as:

What is developed in botanical gardens to grow plants from other regions?