What is true for $X$ in the figure representing the species-area relationship?

Select the correct option from the following.

$A$ species facing an extremely high risk of extinction in the immediate future is called:

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Clarias gariepinus	$(1)$ Zebra
$(b)$ Lantana	$(2)$ Tiger
$(c)$ Bali	$(3)$ Weed
$(d)$ Quagga	$(4)$ African Catfish

Which of the following statement$(s)$ is/are correct?
$(i)$ Rich biodiversity is not essential for ecosystem health.
$(ii)$ The current rate of species extinction is $100$ to $1000$ times faster than the pre-human extinction rate.
$(iii)$ Steller's sea cow became extinct due to overexploitation by humans.
$(iv)$ Even if we combine all biodiversity hotspots,they cover less than $2 \%$ of the Earth's land area.
$(v)$ The rate of mass extinction can be completely reduced by strict protection of hotspots.

The World Summit on Sustainable Development held in $2002$ in Johannesburg,South Africa,pledged for: