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If the 25 to 39 age group is unusually broad in a country's population pyramid while adjacent younger and older groups are narrower, which cause is most likely?

Answer and explanation

Correct answer: Age-selective in-migration of young adults

The governing concept is age structure: the width of each horizontal bar represents the relative size of a particular age group. Ages 25 to 39 are mainly young-adult and working ages. A concentrated bulge in this section, with narrower groups immediately below and above it, is most plausibly produced when people in these ages move into the country for employment, education, marriage, or other opportunities. This is age-selective in-migration. High infant mortality would reduce the youngest bars, elderly in-migration would widen older bars, and fertility becoming zero would affect younger cohorts rather than create a young-adult bulge. Therefore, option C is correct.

Related tags

Age-Selective MigrationPopulation PyramidYoung AdultsAge StructurePopulation CompositionGeographyClass 12 Mcq

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