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Rather, it is growing at a very alarming rate.

Population growth is one of the major concerns of the present world as the human population is not a static factor. Rather, it is growing at a very alarming rate. In spite of the increasing world population, the resources of the  earth  remain constant. Thus, the ability to maintain sustainable development is becoming a major challenge to mankind today. Also Read:  Difference between morbidity and mortality

The fluctuations in the population in a given area are influenced by four major factors, which include the following:

Thus, it is clearly visible, that Natality (N) and Immigration (I) add to a population, thus increasing population whereas, Mortality (M) and Emigration (E) decrease the population. The population density (P t ) at a given point of time can be given as: P t  =P 0  + (N + I) – (M + E) where, P 0  is the initial population density. We have two growth models which describe the basic growth trend in a population. These are:

Where, r = intrinsic rate of natural increase This equation can be represented with a graph which has a J shaped curve. According to calculus

Where, N t  = Population density at time t N 0 = Population density at time zero r = intrinsic rate of natural increase e = base of natural logarithms

The availability of limited resources cannot show exponential growth. As a result, the graph will have a lag phase, followed by an exponential phase, then a declining phase and ultimately an asymptote. This is known as Verhulst-Pearl Logistic Growth and is represented using the equation: dN/dt = rN((K-N) /K) We have thus explained the population growth in brief. For further details, please visit our website or download StudySolver learning app. Also Read:  Allee Effect

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