Question

What does the shape of the given age pyramids (A to C) reflect on the growth states of populations?

(a) Declining, stable, expanding
(b) Stable, expanding, declining
(c) Expanding, stable, declining
(d) Declining, expanding, stable

Answer 1

Hint: A population pyramid, also referred to as an "age-gender-pyramid", and is a graphical representation of the distribution of varied age group persons in a population.

Complete answer:
The shape of the given age pyramids reflects the expanding, stable, and declining states of populations respectively. It forms the shape of a pyramid when the population is growing or increasing or expanding. On the graph, males are conventionally presented on the left and females on the right side. They may be measured based on raw numbers or as a percentage of the total population. Based on the fertility and mortality rates of a country the population pyramid can be divided into the following three types:
1)"Stationary" or stable pyramid
2)"Expansive" or expanding pyramid
3)"Constrictive" or declining pyramid

Additional Information: -A pyramid can be said to be stationary if the percentages of the population (age and sex) remain constant over time. A population is called a stationary population when the death rate of the population becomes equal to the birth rate.
-The expanding population pyramid t is very wide at the younger ages. This type of pyramid is found in countries with high birth rates and low life expectancy. This type of population is said to be fast-growing, and the size of each birth column gets larger as compared to the size of the previous year.
-The declining population pyramid is narrowed at the bottom. This population is generally older on average as the country has a long life expectancy, because of the low death rate, and also a low birth rate too. Here, the percentage of the younger population is extremely low, this can cause issues with the dependency ratio of the population. When immigrants are factored out this pyramid is more common. This is a typical pattern for a developed country, a high level of education, quick access to and incentive to use contraception, healthiness care, and few negative environmental factors.
So, the correct answer is, ’Expanding, stable, declining’.

Note: -A pyramid is a tool that helps to visualize and age a particular population. In ecology it is also used to determine the overall age distribution of a population; this is an indication of the reproductive capabilities and likelihood of the continuation of a species on the earth.
-Each country will have different or unique population pyramids depending upon the educational, economic, health facilities, and other developments of a country.