Question

Which of the following country’s population does not have a triangular shaped age sex pyramid?

• A. Australia
• B. Bangladesh
• C. Nigeria
• D. Mexico

Answer 1

The Correct Option is A

In the context of age-sex pyramids, the shape of the pyramid reflects the birth rates, death rates, and the general demographic make-up of a country. A triangular shaped age-sex pyramid is characteristic of countries with high birth rates and high mortality rates. Generally, these are developing countries where a large portion of the population is young, resulting in a wide base that tapers sharply.

Let’s analyze the options: 

• Australia: This country typically has a more evenly distributed age-sex pyramid that is not triangular. Developed nations like Australia often show a column-like or slightly expanding shape due to lower birth rates and longer life expectancies. This suggests more balanced numbers across different age groups rather than the sharp taper found in triangular pyramids.
• Bangladesh: Often displays a triangular pyramid due to higher birth rates and a younger population.
• Nigeria: Similarly, Nigeria frequently shows a triangular shape due to a high proportion of young people, indicative of high birth rates.
• Mexico: While transitioning, Mexico has historically had a triangular age-sex pyramid, although it is gradually evolving to a bell-shaped or barrel-shaped form as birth rates fall and life expectancy increases.

Conclusively, the country whose population does not have a triangular shaped age-sex pyramid is Australia.

Answer 2

Let's analyze the age-sex pyramids of the countries mentioned:

(A) Australia: Australia has a rectangular-shaped age-sex pyramid. This shape is typical of more developed countries, where there is a relatively stable population with lower birth rates and longer life expectancies. The pyramid's shape reflects the aging population with fewer children being born, and a larger proportion of the population is in the middle and older age groups.

(B) Bangladesh: Bangladesh, a developing country, has a triangular-shaped age-sex pyramid, typical of countries with high birth rates and lower life expectancy. The pyramid shows a large number of children at the base and a smaller number of older individuals at the top, which indicates rapid population growth.

(C) Nigeria: Nigeria also has a triangular-shaped age-sex pyramid. It is a country with a high birth rate and a relatively young population, which results in a wide base and a narrow top in its population pyramid.

(D) Mexico: Like Bangladesh and Nigeria, Mexico has a triangular-shaped age-sex pyramid, as it is a developing country with high birth rates and a youthful population.

The only country from the list that does not have a triangular-shaped age-sex pyramid is Australia, as it has a more stable, rectangular-shaped population pyramid.

Thus, the correct answer is (A) Australia.