If the high-altitude birds become rare or extinct,the plants which may disappear along with them are

$Nepenthes$ $khasiana$ is a/an:

Elaborate how invasion by an alien species reduces the species diversity of an area.

Threats to biodiversity come from:

Of the four major causes for the loss of biodiversity (Alien species invasion,habitat loss and fragmentation,over-exploitation,and co-extinctions),which according to you is the major cause for the loss of biodiversity? Give reasons in support.

Choose the correct pair for the $IUCN$ Red List $(2004)$ documents of species extinction.

Column-$I$	Column-$II$
$(a)$ Vertebrates	$(p) \; 359$
$(b)$ Plants	$(q) \; 784$
$(c)$ Invertebrates	$(r) \; 87$
	$(s) \; 338$