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

July $11$ is observed as

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

On which day did the world population reach the $5^{th}$ billion mark?

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 impact of human population is directly related to