"Population is an auto-regulated system" was said by

According to the $1991$ census,the population density of Madhya Pradesh is:

Find out the population density when $N$ is $1000$ and $S$ is $100 \, m^{2}$.

If there were $30$ lotus plants in a pond last year and through reproduction $10$ new plants were added, taking the current population to $40$, then the birth rate = $.........$ offspring per lotus per year.

If $4$ individuals in a laboratory population of $40$ fruitflies died during a specified time interval (i.e.,a week),the death rate in the population during that period is

Differentiate between Immigration and Emigration.