Question:
A population having constant size and composition is called a:
A population having constant size and composition is called a:
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A stable population keeps its age composition fixed but its size can still grow or shrink; add the condition of zero growth rate and the size becomes fixed too, that is a stationary population.
Updated On: Jul 4, 2026
- Stable population
- Stationary population
- Fixed population
- Continuous population
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The Correct Option is B
Solution and Explanation
Step 1: A stable population is one in which the age specific fertility and mortality rates stay constant over time. This keeps the proportion of population in each age group (the age composition) constant, but the total size can still grow or decline exponentially at a fixed rate.
Step 2: A stationary population is a special case of a stable population in which that constant growth rate is exactly zero, so births exactly balance deaths every year.
Step 3: Because the growth rate is zero, a stationary population has both constant age composition and constant total size, unlike a general stable population whose size can still change.
Step 4: Therefore a population with constant size and constant composition is called a stationary population.
Final answer: option (B).
Step 2: A stationary population is a special case of a stable population in which that constant growth rate is exactly zero, so births exactly balance deaths every year.
Step 3: Because the growth rate is zero, a stationary population has both constant age composition and constant total size, unlike a general stable population whose size can still change.
Step 4: Therefore a population with constant size and constant composition is called a stationary population.
Final answer: option (B).
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