The population of India in the early $21$st century was approximately: (in $crore$)

In which of the following countries is the birth rate high and the death rate normal?

Which one of the following causes population explosion?

In which of the following states is the number of females higher than the number of males?

As a country becomes industrialized,its population growth:

The $20^{th}$ century has witnessed a remarkable increase in the population of the world and especially in India. One major factor for this is that