A biologist studied the population of rats in a barn. He found that the average natality was $250$, average mortality $240$, immigration $20$ and emigration $30$. The net increase in population is

Verhulst - pearl logistic growth is described by the equation.

A population of Paramoecium caudatum was grown in a culture medium. After $5$ days the culture medium became overcrowed with Paramoeium and had depleted nutrients. What will happen to the population and what type of growth curve will the population attain ? Draw the growth curve.

Any species growing ...$A$... under unlimited resource conditions can reach enormous population densities in a short time. Darwin showed how even $\ldots$ $B$... growing animal like elephant could reach enormous numbers in absence of check and that characteristics of organism is called $C$

Choose the correct option for $A , B$ or $C$ respectively

The standard of living is very badly affected by

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur