Mangrove vegetation is found in

Read the following statements:
$I.$ Species diversity increases as we move away from the equator towards the poles.
$II.$ Stellar's sea cow and passenger pigeon got extinct due to overexploitation by man.
$III.$ Lantana and Eichhornia are invasive weed in India.
$IV.$ The historic convention on biological diversity was held in $1992.$
Choose the option containing correct statements.

Why are coral reefs not found in the regions from West Bengal to Andhra Pradesh,but are found in Tamil Nadu and on the east coast of India?

What does '$X$' represent in the given graph?

Given below are two statements.
Statement $I$: $Rauwolfia$ $vomitoria$ found in Himalayan ranges shows variation in potency and concentration of active component reserpine.
Statement $II$: Ecosystem diversity is observed in regions of Rann of Kutch.
In the light of the above statements,choose the correct option.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Edward Wilson	$(i)$ Ecosystem experiments on plots
$(b)$ Alexander von Humboldt	$(ii)$ Rivet Popper Hypothesis
$(c)$ David Tilman	$(iii)$ Coined the term Biodiversity
$(d)$ Paul Ehrlich	$(iv)$ Species-Area relationships