What is Population?
A discrete assemblage of entities with identifiable characteristics such as people, animals with the objective of analysis and data collection is called a population. It consists of a similar group of species who dwell in a particular geographical location with the capacity to interbreed. To interbreed, individuals in a population must be able to mate with other individuals in order to produce fertile offspring.
Not all individuals are able to survive and reproduce due to genetic variations in them.
A local population can be restricted to a smaller area or can occupy a larger area, making up for the entire species.
A metapopulation is when individuals in local populations scatter between other local populations.
Most of the populations are not stable due to various physical factors prevailing in the environment which act as limiting factors against exponential growth of the population.
A graph that displays the age-sex distribution of a country’s human population at a given frame of time is referred to as a population pyramid. It shows the variation in the population of the male and females with age that is otherwise (bar graphs) not feasible. It results in a pyramidal structure where the population is on the x-axis and age is on the y-axis.
Population Pyramids
There are three types of population pyramids:
1. Expansive Pyramid
It is triangular in shape wherein each age group displays a bar shorter than the one preceding it, symbolising that more people die as we progress through the pyramid. A large base indicates a high birth rate. The tapering top of the graph indicates the lesser life expectancy of a region.
2. Constrictive Pyramid
With a slight reduction in the younger group of age, it is the opposite of expansive pyramid. Life expectancy is higher and living conditions are better indicating a high number of older citizens. Despite this, a decrease in population is seen due to fewer birth rates compared to the death rate.
3. Stable Pyramid
It is rectangular in shape indicating an equal distribution of people across all age groups. A slight tapering at the top denotes more death occurring among the older people, which is natural. A stable birth rate indicates the use of birth control measures. Life expectancy in such regions is high due to better living conditions, availability of medical services etc.
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FAQs
And while every population pyramid is unique, most can be categorized into three prototypical shapes: expansive (young and growing), constrictive (elderly and shrinking), and stationary (little or no population growth).
What are the different types of population pyramids? ›
There are generally three types of population pyramids created from age-sex distributions-- expansive, constrictive and stationary.
What is a population pyramid answers? ›
A population pyramid is a graph that shows the distribution of ages across a population divided down the center between male and female members of the population. The graphic starts from youngest at the bottom to oldest at the top.
What are the types of population? ›
Population
- Finite Population.
- Infinite Population.
- Existent Population.
- Hypothetical Population.
Definition of a Population Pyramid. a graph that shows the population structure of an area in terms of age and gender. Population pyramid with a wide base.
What is the population population? ›
8 Billion (2022)
World population has reached 8 billion people on November 15, 2022 according to the United Nations.
What are population pyramids simple? ›
A population pyramid is a graph. It has two back-to-back bars. These bars show the population in groups of ages, with woman in one side and man in the other side. Expansive population pyramid of Angola for 2005 shows a young and rapidly growing population.
What is the definition of a population? ›
a. : the whole number of people or inhabitants in a country or region. b. : the total of individuals occupying an area or making up a whole.
What is the population structure? ›
The distribution of people in a population according to designated demographic traits (e.g. age, sex, country of birth, marital status).
Which are the three main factors that cause population change? ›
Three main factors that cause population change are:
Interpreting a Population Pyramid
Narrow base shows low birth rate as small numbers of children are born. Therefore, narrowing base indicates a falling birth rate. A broad top or wide apex indicates high proportion of people living longer. Straight or near vertical sides depicts a low death rate.
What is the population pyramid chart? ›
A population pyramid (age structure diagram) or "age-sex pyramid" is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing.
What are the different types of population sources? ›
Collecting population data is important because accurate numbers mean proper allocation of resources. Discover the primary sources used to record population data: the census, vital statistics, and the much more frequent samples and surveys.
Why are population pyramids? ›
The population pyramid represents the breakdown of the population by gender and age at a given point in time. It consists of two histograms, one for each gender (by convention, men on the left and women on the right) where the numbers are shown horizontally and the ages vertically.
What are the three age groups? ›
It is common in demography to split the population into three broad age groups:
- children and young adolescents (under 15 years old)
- the working-age population (15–64 years) and.
- the elderly population (65 years and older)
Expansive Pyramids: Recognized by their traditional “pyramid-like” shape with a broad base and narrow top, expansive pyramids reflect a population with a high birth rate along with a high mortality rate which is most common in developing countries.
What are the 3 shapes of population pyramids and what do they indicate? ›
And while every population pyramid is unique, most can be categorized into three prototypical shapes: expansive (young and growing), constrictive (elderly and shrinking), and stationary (little or no population growth). Let's take a deeper dive into the trends these three shapes reveal about a population and its needs.
What are the 3 main population pyramid shapes and their characteristics? ›
1 Answer
- Expansive Population Pyramids:- This pyramid depicts large population of young aged people. ...
- Constructive Population Pyramids:- It depicts lower percentage of young aged people. ...
- Stationary Population Pyramids:- It depicts equal population of both young and and old aged people.
Individuals may be distributed in a uniform, random, or clumped pattern. Uniform means that the population is evenly spaced, random indicates random spacing, and clumped means that the population is distributed in clusters.
How are population pyramids organized? ›
An age structure diagram, or population pyramid, shows the distribution of age and sex in a population. The y-axis of the diagram shows age groups from birth to old age. The x-axis shows the population percentage.
