The main objective of plant conservation is ..........

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

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.

Identify $X, Y$ and $Z$ from the given pie charts representing global biodiversity of invertebrates and vertebrates:

Identify the incorrect statement.
$I$. Speciation is generally a function of time.
$II$. Tropical environment is less seasonal,relatively more constant and predictable.
$III$. Solar energy contributes to high productivity.
$IV$. Temperate regions have remained relatively undisturbed for millions of years.

Find the wrongly matched pair.