In a population where competition between individuals is severe,the distribution is said to be:

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

Which one of the following is $NOT$ a characteristic of a population?

The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
$(a)$ Bacteria $.......................$
$(b)$ Banyan $ .......................$
$(c)$ Deer $ .......................$
$(d)$ Fish $ ......................$

Under a particular set of selection pressure,organisms evolve towards the most $A$ reproductive strategy. Some organisms breed only $B$ in lifetime while others breed $C$ in lifetime. Choose the correct option for $A, B$ and $C$.

When there is a large number of post-reproductive or older individuals and a lesser number of pre-reproductive individuals,then that population is: