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Population momentum is a consequence of the demographic transition.Population momentum explains why a population will continue to grow even if the fertility rate declines. . Population momentum occurs because it is not only the number of children per woman that determine population growth, but also the number of women in reproductive
In population genetics and population ecology, population size (usually denoted N) is a countable quantity representing the number of individual organisms in a population. Population size is directly associated with amount of genetic drift , and is the underlying cause of effects like population bottlenecks and the founder effect . [ 1 ]
Population. The population of India as per 2011 census was 1,210,854,977. [31] India added 181.5 million to its population since 2001, slightly lower than the population of Brazil. India, with 2.4% of the world's surface area, accounts for 17.5% of its population. Uttar Pradesh is the most populous state with roughly 200 million people.
Population change. Population change is simply the change in the number of people in a specified area during a specific time period. Demographics (or demography) is the study of population statistics, their variation and its causes. These statistics include birth rates, death rates (and hence life expectancy), migration rates and sex ratios.
Child sex ratio in India. The child sex ratio in India is defined as the number of females per thousand males in the age group 0–6 years in a human population. [1] Thus it is equal to 1000 x the reciprocal of the sex ratio (ratio of males to females in a population) in the same age group, i.e. under age seven.
The effective population size (Ne) is the size of an idealised population that would experience the same rate of genetic drift as the real population, whereby the latter, due mainly to the limited proportion of breeding individuals, has a normally larger census population size N. Idealised populations are based on unrealistic but convenient ...
[10] [11] In 2017 its population growth rate was 0.98%, ranking 112th in the world; in contrast, from 1972 to 1983, India's population grew by an annual rate of 2.3%. [ 12 ] In 2023, the median age of an Indian was 29.5 years, [ 13 ] compared to 39.8 for China and 49.5 for Japan; and, by 2030; India's dependency ratio will be just over 0.4. [ 14 ]
The Leslie matrix is a discrete, age-structured model of population growth that is very popular in population ecology named after Patrick H. Leslie. [1] [2] The Leslie matrix (also called the Leslie model) is one of the most well-known ways to describe the growth of populations (and their projected age distribution), in which a population is closed to migration, growing in an unlimited ...