A systematic study of population is called as __________.

Demography

Demography is the systematic study of population. The term is of Greek origin and is composed of the two words, demos (people) and graphein (describe), implying the description of people. Demography studies the trends and processes associated with population including – changes in population size; patterns of births, deaths, and migration; and the structure and composition of the population, such as the relative proportions of women, men and different age groups.