Question

With the help of neatly labelled diagrams, explain the different types of age pyramids of human population.

Answer 1

The three different types of age Pyramids for human population are:

1. Expanding or triangular age pyramids of human population:
   1. A large proportion of pre-reproductive individuals exist in the expanding population.
   2. The graph is triangular, with an extremely wide base and a pointy apex.
   3. Each age group shows a bar less wide than that of the age group before it, indicating that more people die in each higher group.
   4. The high birth rate in the vast base is likely attributable to variables such as a developing economy, poverty, low female education, and lack of information about birth control options.
   5. This type of population increase is seen in countries like India and Brazil.

2. Stable age or bell-shaped age pyramid of human population:

   1. In a stable population, individuals who have not yet reached reproductive age exhibit uniform characteristics. 
   2. The population distribution is depicted as rectangular or squarish on a graph, with nearly equal numbers across all age groups.
   3. A slight narrowing at the top is natural, reflecting a higher incidence of deaths among the elderly.
   4. This demographic pattern is commonly seen in countries with elevated life expectancies, where a significant portion of the population enjoys a longer lifespan due to improved living conditions. Examples of countries with this type of population growth include Denmark and the USA.

3. Constructive or declining age pyramid of human population:

   1. There is a greater representation of individuals in the reproductive age category compared to those in the pre-reproductive age group.
   2. It pertains to populations that are decreasing or experiencing negative growth.
   3. Countries exhibiting this trend boast an elevated life expectancy, with a significant portion of the population living to an advanced age, thanks to improved living conditions.
   4. This demographic pattern is evident in nations such as Japan.