In a population of an area, natality was equal to mortality for a given time period. However, the population density of the population increased. Which of the following may be the reason for the increase?

Question

In a population of an area, natality was equal to mortality for a given time period. However, the population density of the population increased. Which of the following may be the reason for the increase?, Number of immigrants = number of emigrants, Number of immigrants > Number of emigrants, Number of immigrants Number of emigrants, Cannot be predicted

MARKS App · Accepted Answer

Natality and immigration contribute to an increase in population density, whereas mortality and emigration tend to decrease the size. The density of a population ( N ) at time t can be expressed after a period of time ( t + 1) as: N (t+1) = N t + [ (B + I) - (D + E) ] where B denotes the number of births, I denotes the number of immigrants, D is the number of deaths and E is the number of emigrants. If B = D , and N (t+1) > N t , then I > E .

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