A bell-shaped age pyramid represents – (a) expanding population (b) stable population (c) extinct population (d) declining population

By BYJU'S Exam Prep

Updated on: September 25th, 2023

A bell-shaped age pyramid represents a stable population. When the reproductive and pre-productive individuals are equal in percentage or numbers and post-reproductive individuals are fewer relatively, the population remains stable. A population is made up of people who are currently in different age groups. Pre-reproductive, reproductive, and post-reproductive age groups can be used to categorise the people in a population.

  • The term “age pyramid” refers to a visual representation of a population’s age distribution.
  • The age pyramid is created by plotting the percentage of the population that is each given age or age group.
  • People in the pre-reproductive age group make up the pyramid’s base, people in the reproductive age group are in the middle, and people in the post-reproductive age group are at the top.
  • The age pyramid’s shape provides information on the population’s rate of growth. Demographers use it to research the human population.
  • Age pyramids are also known as age-sex pyramids because they typically include information about the age distribution of males and females (sex) in the human population. Whether the population is increasing, stable, or decreasing is indicated by the pyramid’s shape.

Age pyramids

  1. Bell-shaped age pyramids develop when the proportions of pre- and reproductive individuals are about equal, while the post-reproductive population is substantially smaller. A constant population of this kind is anticipated.
  2. Age pyramids take on a triangular shape when there are a large number of people in the pre-and reproductive age groups and a small number of people in the post-reproductive age group. It is expected that this population will increase or spread.
  3. Age pyramids in the shape of an urn show low proportions of pre-reproductive people, the greatest number of people in the reproductive age group, and the smallest number of people in the post-reproductive age group. One claims that this population is dwindling.

Demographers use age pyramids to analyse human populations and forecast how a population will grow in the future. Because extinct organisms no longer exist, age pyramids cannot be built for them, and instead, there is no reason to build age pyramids for extinct organisms.


A bell-shaped age pyramid represents -(a) expanding population(b) stable population(c) extinct population(d) declining population

Age pyramids in the form of bells indicate stable populations. Population stability occurs when pre- and post-reproductive individuals are relatively few and equal in percentage to reproductive individuals.

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