Question

List any three important characteristics of a population and explain.

Answer 1

Characteristics are:

Population density, population growth, age distribution, birth rate, death rate, sex ratio etc.
(1) Population density:-

Indicates size of population. It is number of individuals of a population found in a unit area or space at a given time. It is found out by total count
Random sampling.

\(D = \frac{N}{S}\)

D – Population Density
N – total number of individuals of given area
S - unit of space or area

(2) Population growth:-

It is increase in size of the population over a period of time.
N_t = N_o + (natality +Immigration) – (Mortality +Emigration)
N_t = N_o + B + I - (D + E)
N_t = Population increase after time t;
N_o = Population at t = 0

(3) Age distribution :-

Pre-reproductive, reproductive, post – reproductive.
it helps to provide information about the population

Expending, Declining or Stable population.