A country's population pyramid shows a triangular shape with a narrow top and wide bottom. Which characteristic best describes this demographic pattern?

Appeared in: NORCET 9 Mains - 2025

Explanation

A population pyramid is a graphical representation of the age and sex distribution of a population.
A triangular shape with a wide base and narrow top is known as an expansive pyramid.
The wide base is the key feature, directly indicating a large number of newborns and young children, which is a result of a high birth rate.
The narrow top signifies a smaller elderly population, often due to high mortality rates and lower life expectancy.
This pattern is characteristic of a rapidly growing, youthful population, common in developing nations.

Option A: Low birth rates would result in a narrow base of the pyramid, not a wide one. This shape is characteristic of a constrictive or stationary population.
Option B: A high elderly population would be represented by a wide top of the pyramid, which contradicts the 'narrow top' described in the question. This is a feature of a constrictive pyramid.
Option D: The dependency ratio measures the burden on the working-age population. A wide base means a large number of young dependents (0-14 years), which leads to a HIGH dependency ratio, not a low one.

Visual 1: Infographic: Side-by-side comparison of the three main types of population pyramids: Expansive (triangular), Stationary (rectangular), and Constrictive (urn-shaped). Each pyramid should be labeled with its key characteristics (birth rate, death rate, life expectancy, growth pattern).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Interpretation of Population Pyramids as background academic context rather than a clinical decision trigger.
Understanding a country's population structure is crucial for public health planning and policy-making.
A country with an expansive (young) pyramid needs to prioritize pediatric care, vaccinations, maternal and child health services, and education.
In contrast, a country with a constrictive (aging) pyramid must focus on geriatric care, chronic disease management, and social security systems for the elderly.

How to Approach the Question

First, identify the key descriptors in the question: 'triangular shape', 'narrow top', and 'wide bottom'.
Recall or deduce what each part of a population pyramid represents. The horizontal axis is the population size, and the vertical axis is age. The base represents the youngest age groups, and the top represents the oldest.
Connect the shape to demographic characteristics. A 'wide bottom' directly translates to a large number of young people, which means a high birth rate.
A 'narrow top' means a small number of old people, suggesting a higher death rate or lower life expectancy.
Evaluate each option based on this analysis. The option 'High birth rates with a large young population' is a direct interpretation of the wide base.
Systematically eliminate the other options. Low birth rates would create a narrow base. A high elderly population would create a wide top. A high number of young dependents leads to a high, not low, dependency ratio.

Concept Tested & Keywords

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