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In which situation can population keep growing for some time even after birth rate declines?

Answer and explanation

Correct answer: When a large young population already exists

Direct answer: Option B is correct. Population does not respond instantly to a fall in the birth rate. If a country already has a large number of young people, many of them will enter the reproductive age group during the coming years. Even if each family has fewer children than before, the large number of potential parents can produce many births in total. This continuing growth caused by the existing age structure is called population momentum. Option A is wrong because a zero base population cannot produce continuing births. Option C is wrong because a death rate much higher than the birth rate would reduce the population naturally. Option D is wrong because out-migration removes people and normally reduces the population of the place. Memory cue: a large young base can keep the population moving upward even when birth rates are moving downward.

Related tags

Population MomentumYoung PopulationBirth RateProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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