Representation of data in the graphical manner helps in easy understanding of the pattern. This helps in easy interpretation of the information.
Graph 1 indicates that there is a steady increase in the population of organisms with respect to time.
Graph 2 shows that population steadily reached its highest point and then decreased to reach its initial number.
Graph 3 shows unsteady changes in the population growth. After each increase there is a phase of population decrease.
Graph 4 shows that there has been no increase or decrease in the population size over a period.