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Why should the time period be the same while comparing population growth rates?

Answer and explanation

Correct answer: So that the comparison is on the same basis

Direct answer: A is correct. A population growth rate measures change in population over a specified period, often in relation to the starting population. To compare two places or two periods fairly, the length of time must be comparable. If one rate covers a short period and another covers a much longer period, the observed change may reflect the different durations rather than a real difference in growth. Using the same time period puts both observations on a common basis and makes the comparison more meaningful. B is wrong because equal time periods do not make deaths zero. C is wrong because migration may continue and can itself affect growth. D is unrelated because area does not disappear. Memory cue: fair growth comparison requires the same time interval and attention to the starting population.

Related tags

Population GrowthGrowth RateTime PeriodPopulation ComparisonPopulationGeographyClass 9 Mcq

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