Question

What is logistic growth?

Answer 1

Hint: : The number of individuals in the population changes with time which is also referred to as its growth. Thus the population is said to be changing every now and then. This type of population growth is represented by a logistic growth curve.

Complete answer:
A population represents a unit of biotic community with a near-permanent group of species occupying space at a particular time and interbreeding freely. The density of the population in a given habitat changes due to fluctuations in basic processes like natality or birth rate, mortality or death rate, immigration, and emigration.
Population growth can be studied by either logistic growth or exponential growth.
The population is dependent upon natural resources and the resources are not unlimited due to this the density of the population increases or decreases. In a population, each individual has certain resources that they can use. So the particular environment has individuals or populations according to their carrying capacity which is the maximum population size an environment can withstand. The growth sometimes slows down due to the climatic conditions, competition among individuals, or predation. This type of growth can be represented by a logistic growth curve which is an S-shaped graphical representation showing the population growth with the carrying capacity.

Additional Information:
-Population growth generally depends on factors like food availability, predation threat, weather, and competition.
-When the resources are present in abundance for all the members of the population and the population size has increased to a maximum number of offspring that were born per individual then it is said that the growth is exponential. This is also known as geometric growth
-Such a population growth model, when plotted graphically, results in a J-shaped curve. This curve is obtained when the population over time is plotted in the graph.

Note:
Population dispersal is the movement of individuals into or out of the population or the population area. It occurs in the three following ways:
Emigration: It is the one-way outward movement of individuals from an area.
Immigration: The inward movement of individuals in a one-way only into an area.
Migration: The departure and return of individuals periodically to the same area.

                                                                     Fig: Logistic growth curve