According to the $1991$ census,the maximum percentage of population increase was in which state?

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$(a)$ Allen's Rule	$(i)$ Kangaroo rat
$(b)$ Physiological adaptation	$(ii)$ Desert lizard
$(c)$ Behavioural adaptation	$(iii)$ Marine fish at depth
$(d)$ Biochemical adaptation	$(iv)$ Polar seal

Choose the correct answer from the options given below.

The given human population age pyramid represents..........

Identify the type of age pyramid for the human population shown in the image and state what it represents.

Which of the following statements is correct?
$I.$ In a population,birth rate and death rate refer to per capita births and deaths,respectively.
$II.$ In nature,we rarely find isolated single individuals of any species.
$III.$ The size of a population for any species is a stable phenomenon.
$IV.$ Ecological effects of any factors on population growth are generally reflected in its size/population density.

$A$: Different ecotypes of a species,despite being genotypically different,are interfertile.
$R$: They are locally natural selections from a pool of genetic variations found in the gene pool of a species.