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In which situation can population keep growing after the birth rate falls due to population momentum?

Answer and explanation

Correct answer: When the share of the young age group is large

The direct answer is A. Population momentum means that population may continue to grow for some time after fertility or birth rates begin to fall. The reason is age structure. If a country or region has a large group of young people, many of them will enter reproductive ages in the future. Even if each person has fewer children than earlier generations, the large number of potential parents can produce many births. Option B is wrong because an entirely elderly population with zero births cannot maintain growth through births. Option C is wrong because without a reproductive-age group, this mechanism cannot operate. Option D is wrong because an area with no population has no people to produce population momentum. Memory cue: falling birth rate is a rate change; a large young age group can keep the number of births substantial for a while.

Related tags

Population MomentumAge StructureBirth RatePopulation GrowthPopulationGeographyClass 9 Mcq

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