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In which condition can the population of an area decrease?

Answer and explanation

Correct answer: Deaths and out-migration are high

Direct answer: B is the best choice. Population change is determined by two balances: natural change, which compares births with deaths, and migration change, which compares in-migration with out-migration. Deaths reduce the number of residents, while out-migration removes residents from the area. Therefore, if deaths and out-migration are sufficiently high and together exceed births and in-migration, the population decreases. A normally adds people because births and in-migration increase the total. C produces natural increase because births exceed deaths. D produces a positive migration balance because more people enter than leave. Strictly, merely saying that deaths and out-migration are “high” does not guarantee decline unless losses exceed additions, but B is the only option that describes the decreasing forces and is clearly the intended answer. Memory cue: population change = births − deaths + in-migration − out-migration.

Related tags

Population DeclineDeathsMigrationPopulation ChangePopulation DensityPopulationGeographyClass 9 Mcq

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