The most important factor which determined the increase in human population in India during the $20^{\text {th }}$ century.

The primary cause behind rapidly growing population of the world in recent times is

Maximum survival and reproductive capacity shown by a population under optimal environmental conditions is called

When environmental conditions are favourable, then population growth curve will be

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 life time

Choose the correct option for $A, B$ and $C$