What does sigmoid growth curve of a population indicate?

What does J-shaped growth curve of a population indicate?

What is sigmoid curve?

When does the growth rate of a population following logistic model equal zero? The logistic model is given as dN/dt=rN(K-N/K).

A population of Paramecium cauatum was grown in a culture medium. After 5 days the culture medium became overcrowded with Paramecium and had depleted nutrients. What will happen to the population and what type of growth curve will the population attain? Draw the frowth curve.

Sigmoid growth curve is represented by

When the number of immigration and births is more than emigration and deaths. Growth curve of population will show:

Name two types of growth curves.