The ratio of birth and death rates according to the $1991$ census is:

Per year growth in India's population according to the $1991$ census is (in $\%$)

Generally,there was a population growth rate increase in India,but in which of the following years was there a decrease in the population growth rate?

The population growth of India from $1981$ to $1991$ is (in $\%$)

Infant mortality rate is minimum in:

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