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In which condition can migration affect the sex ratio of an area?

Answer and explanation

Correct answer: When migration is mainly of one sex

Direct answer: B. Sex ratio describes the balance between females and males in a population. Migration changes this balance when the people moving are mainly male or mainly female. For example, if many men leave an area for employment while women remain, the area may show relatively more females. If mostly women move into or out of an area, the opposite pattern may occur. A is not the best answer because equal movement of males and females generally does not create a major sex-ratio difference through migration. C is wrong because without migration there is no migration-related change in the ratio. D concerns births and deaths, which can affect population change but does not describe the migration condition asked here. The important idea is selective migration: the composition of movers matters, not merely their number. Memory cue: one-sex migration can change the male-female balance.

Related tags

Sex-RatioMigration-CompositionPopulation-StructureProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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