What is a population pyramid? Describe India's
population pyramid. What conclusions can
you draw from it? How is it expected to change
by 2050?
Answers
Explanation:
A population pyramid, also called an "age-gender-pyramid", is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing.[1] Males are conventionally shown on the left and females on the right, and they may be measured by raw number or as a percentage of the total population. This tool can be used to visualize and age of a particular population.[2] It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species.
Structure
TypesEdit
Each country will have different or unique population pyramids. However, population pyramids will be defined as the following: stationary, expansive, or constrictive. These types have been identified by the fertility and mortality rates of a country.[6]
"Stationary" pyramidA pyramid can be described as stationary if the percentages of population (age and sex) remains constant over time.[7] Stationary population is when a population contains equal birth rates and death rates.[7]"Expansive" pyramidA population pyramid that is very wide at the younger ages, characteristic of countries with high birth rate and low life expectancy.[6] The population is said to be fast-growing, and the size of each birth cohort gets larger than the size of the previous year.[8]"Constrictive" pyramidA population pyramid that is narrowed at the bottom. The population is generally older on average, as the country has long life expectancy, a low death rate, but also a low birth rate.[6] However, the percentage of younger population are extremely low, this can cause issues with dependency ratio of the population.[8] This pyramid is more common when immigrants are factored out. This is a typical pattern for a very developed country, a high level of education, easy access to and incentive to use birth control, good health care, and few negative environmental factors.[9]