JAMB Geography 2015 Paper

Concept:Population growth rate is the net change in the number of individuals in a population over a given period of time.Explanation:A population increases through births, called natality, and decreases through deaths, called mortality.So the growth rate is best expressed as the difference between the natality rate and the mortality rate.This may be written as:$$\text{Population Growth Rate} = \text{Natality Rate} - \text{Mortality Rate}$$It is not concerned with frequency, density, or mortality alone.Instead, it looks at the net result of births and deaths in a particular area over a specific time period.When births exceed deaths, the population grows; when deaths exceed births, the population declines.Therefore, the option that refers to the net rate over a unit area over a period of time is the correct one.Answer:D