Question

Percentage ratio of natality over mortality is
(a) Vital index
(b) Population dynamics
(c) Population density
(d) Total count

Answer 1

They measure the ratio of birth to deaths of people in any period of time. It determines the expansion of a population. Natural growth is the difference between the number of births and deaths in a particular population.

Complete step by step answer:
Birth rate or natality rate is defined as the number of births per 1,000 individuals of a population per year. Death rate or mortality rate is generally expressed as the number of deaths per 1,000 individuals of a population per year. Vital index is the percentage ratio of natality above mortality. Vital index is calculated as the ratio of births to deaths inside a population during a given time and is used to determine the expansion of the population. The vital index is of utmost importance to Census surveyors for collecting data on the basis of such an index.Government schemes are based on vital index to weigh on the access of schemes to the rural population or target group.
$Vital\quad Index\quad =\quad \frac { Natality }{ Mortality\quad } \times 100$

Additional information: A population is a group of people of an equivalent species that occupy a selected area over a particular period of time. Population dynamics mentions how populations of a species change over time. The estimation for population density is the total population divided by the land area. The information is available for all standard geographic areas. Total count is the total number of living or dead cells during a given volume or area. So, the right answer is ‘Vital index’.
Note: The ratio of total growth during a given period to the mean population of that period is named the expansion rate. The vital index measure is not any longer much used. When time is treated as a discrete variable, reference is formed to geometric growth. This is often occasionally called a Malthusian population, but the term is ambiguous in sight of its sociological connotations.