A. Name the two growth models that represents population growth and draw the respective growth curves they represent.

B. State the basis for the difference in the shape of these curves.

C. Which one of the curves represent the human population growth at present? Do you think such a curve is sustainable? Give reason in support of your answer.

A. Two types of growth models are exponential growth and logistic growth

Exponential growth curve:

Logistic growth curve:

B. In exponential growth model the resources and space are unlimited, the population tends to grow in an exponential pattern.

In logistic growth model the resources and space are limited which leads to competition between individuals. In this type of growth, there is an initial lag phase followed by log phase and then in steady state.

C. The present human population follows the logistic growth curve because the human population growing rapidly than the resources. Such a growth pattern is not sustainable because the resources could not meet the demand of increasing population. For sustainable growth it is important to use our resources judiciously.