The measure of the variety of species and their relative abundance present within a region is referred to as

Based on the statements,choose the correct option given below.
Statement-$I$: Western Ghats show greater ecosystem diversity than the Rann of Kutch.
Statement-$II$: Ladakh also shows high levels of ecosystem diversity.

Why is species diversity higher in tropical regions?

According to the representation of global biodiversity proportions for the number of species of major taxa of vertebrates,select the appropriate option for the labels $X$,$Y$,and $Z$ in the given figure.

$(1)$ More than $\underline A\%$ of the drugs currently sold in the market worldwide are derived from plants.
$(2)$ Although all the biodiversity hotspots put together cover less than $\underline B\%$ of Earth's land area,the number of species they collectively harbour is extremely high,and strict protection of these hotspots could reduce the ongoing mass extinction by almost $\underline C\%$.

What distinguishes India from Scandinavian countries in terms of biodiversity?