Diversity index commonly used in ecological studies is

Organisms show diversity in their volume,shape,life style,and many other things. It is called..........

Study the following statements and select the correct option given below:
Statement-$I$: Biodiversity is the variety of features of life observed in the living organisms at different levels within a defined area.
Statement-$II$: Living organisms' attempt to accommodate with different environmental conditions forms the basis of diversity.

The dolphin found in Chilka lake is

Most of the industrialized nations are rich $............$ but poor in $............$.

Match the biodiversity found in the Amazonian rainforest of South America with their respective counts.

List-$I$	List-$II$
$(a)$ Plants	$(1)$ $1,25,000$
$(b)$ Mammals	$(2)$ $427$
$(c)$ Reptiles	$(3)$ $40,000$
$(d)$ Invertebrates	$(4)$ $378$