According to the $2001$ census,the Indian population was:

Infant mortality rate is minimum in:

Which states in India have the highest and lowest population,respectively?

Population explosion occurs due to

Human population in India reached the $1$ billion mark by the year . . . . . . .

Which of the following can be taken as characteristic demographic features of the developing countries?
$(a)$ High fertility rate
$(b)$ Rapidly rising mortality rate
$(c)$ Very young age distribution
$(d)$ Rapid population growth
$(e)$ Rapidly falling mortality rate
$(f)$ Very old age distribution