Which pyramid shape is rectangle-like with low birth rates and low mortality?

Which pyramid shape is rectangle-like with low birth rates and low mortality?

• A. Stationary pyramid
• B. Expansive pyramid
• C. Constrictive pyramid
• D. Triangular pyramid

Answer: (A)

Population pyramids show how many people are in each age group and reflect birth and death patterns. A rectangle-shaped pyramid indicates a stable, stationary population where births are low and deaths are also low. With low fertility, fewer children are born, and with low mortality, people live longer, but the overall age distribution stays relatively even across cohorts. This balance produces a shape that looks like a rectangle rather than a wide base or a top-heavy profile. In contrast, high birth rates create an expansive pyramid with a broad base, while aging populations with declining birth rates create a constrictive shape that narrows at the base.

Population pyramids show how many people are in each age group and reflect birth and death patterns. A rectangle-shaped pyramid indicates a stable, stationary population where births are low and deaths are also low. With low fertility, fewer children are born, and with low mortality, people live longer, but the overall age distribution stays relatively even across cohorts. This balance produces a shape that looks like a rectangle rather than a wide base or a top-heavy profile. In contrast, high birth rates create an expansive pyramid with a broad base, while aging populations with declining birth rates create a constrictive shape that narrows at the base.