Population growth is one of the major concerns of the present world as 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. In the laboratory, we will observe a growth of wolffia and Azolla by using two growth models which describe the basic growth trend in a population such as Exponential growth and Logistic growth.