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If an area has six lakh births, four lakh deaths, and net migration of minus three lakh, what will be the total population change?

Answer and explanation

Correct answer: A decrease of one lakh

Correct answer: A, a decrease of one lakh. First find the natural increase: six lakh births minus four lakh deaths equals two lakh. Next add the net migration, which is negative three lakh: total change = two lakh + (-three lakh) = negative one lakh. A negative total means the population falls by one lakh. Option A is correct. Option B reports the natural increase only and ignores the loss through migration. Option C uses the size of the negative migration but changes its meaning into an increase. Option D treats births as the entire change and ignores deaths and migration. The correct general formula is total population change = (births - deaths) + net migration. Memory cue: a negative migration value is subtracted from the natural increase, not added as a positive number.

Related tags

Population ChangeNatural IncreaseNet MigrationPopulation GrowthPopulationGeographyClass 9 Mcq

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