A population pyramid shows a very wide base representing a large proportion of children under 15 years, with rapid tapering toward the apex representing few elderly persons. What type of population and growth pattern does this pyramid indicate?

• A Stationary population with zero growth
• B Constrictive population with negative growth
• C Expansive population with high fertility and rapid growth ✓
• D Population in the post-transition phase with ageing

Explanation

A triangular pyramid with a broad base and narrow top is an expansive pyramid, characteristic of high birth rates, a young age structure, and rapid population growth, typical of developing countries. A stationary population shows a bell-shaped pyramid with near-vertical sides, while a constrictive pyramid has a narrower base than the middle, indicating low fertility and negative growth with ageing. The description clearly matches the expansive type.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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