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If mortality was unusually high among people aged 20–29 during a war, what pattern may appear in the age pyramid years later?

Answer and explanation

Correct answer: A notch at the corresponding age as that cohort moves upward

An age pyramid shows the size of different age cohorts. If many people aged 20–29 die during a war, that cohort becomes smaller than the surrounding cohorts. As the survivors of that cohort grow older, the same reduced group appears at older ages in later versions of the pyramid. It therefore produces a notch or narrow section that moves upward over time, although later migration, births, and deaths may alter its exact shape.

Option A is correct because it describes the cohort effect. A population pyramid is not expected to have equal width at every age, so B is unrealistic. A war mortality shock among young adults does not permanently widen only the base, making C incorrect. It also does not affect only newborns, so D does not match the information. The important idea is that an event affecting one cohort can remain visible as that cohort ages.

Related tags

War MortalityCohort EffectPopulation PyramidAge StructurePopulation CompositionGeographyClass 12 Mcq

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