Question

(a) Name the two growth models that represent 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. [5]

Answer 1

(a) Exponential and logistic growth models [0.5+0.5]

(b) In exponential growth space and resources available for the organisms are unlimited while in the logistic growth model both the space and the resources are limited.[0.5+0.5]


[0.5+0.5]

(c) Exponential growth curve represents the human population growth at present. [1]

Such a curve is not sustainable because at one point the human population would reach a place where there would not be infinite resources for every one and space limitations will be there (carrying capacity). [0.5+0.5]