The most important factor which determined the increase in human population in India during the $20^{\text{th}}$ century.

Which of the following statements is true regarding individuals of the same species?

Which of the following is $NOT$ a primary factor affecting population density?

$A$ population is correctly defined as having which of the following characteristics?
$(A)$ Inhabiting the same geographical area
$(B)$ Individuals belonging to the same species
$(C)$ Possessing a constant and uniform density and dispersion

Read the following statements and select the correct option with respect to population attributes:
$(a)$ Population density is necessarily measured in numbers.
$(b)$ Tiger census is often based on pug marks and fecal pellets.
$(c)$ Biomass is not a meaningful measure to know population size.
$(d)$ Size of a population for any species is not a static parameter.

Natality of a region is assessed by the rate of . . . . . . of individuals per unit area,per unit time.