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Why is selection of a base year important in studying population growth?

Answer and explanation

Correct answer: Because growth is calculated by comparison with the population in that base year.

The correct answer is A. A base year is the earlier reference point against which a later population is compared. To find absolute growth, we subtract the base-year population from the later population. To find percentage growth, the increase is related to the base-year population, commonly expressed as: percentage growth = (later population − base-year population) ÷ base-year population × 100. Therefore, the selected base year affects the reference and makes comparisons meaningful only when the same basis is used. A is correct because it explains why the base year is needed. B is wrong because a statistical base year does not control weather. C is wrong because it cannot alter physical river direction. D is wrong because a date used for calculation has no power to stop births. Memory cue: base year = starting reference for comparison.

Related tags

Base YearPopulation GrowthPercentage ComparisonPopulationGeographyClass 9 Mcq

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