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A relatively narrow base of a population pyramid can be associated with which condition?

Answer and explanation

Correct answer: Low birth rate

A population pyramid shows the distribution of people by age and sex. Its base represents the youngest age groups. When the base is relatively narrow, children make up a smaller share of the total population. One common reason is a low birth rate, especially when fertility has remained low for several years. A narrow base may therefore suggest smaller younger cohorts and possible future population ageing.

The correct choice is B. A very high birth rate would usually create a broad, not narrow, base because many children would be present. A large child population also produces a broad base. High migration can affect particular age groups and the shape of a pyramid, but “only high migration” is too definite and is not the standard explanation for a narrow base. The most direct association is low fertility or low birth rate.

Related tags

Narrow BaseLow Birth RatePopulation PyramidAgeingAge StructurePopulation CompositionGeographyClass 12 Mcq

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