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

In India,the population crossed the one billion mark in May $2000$. The probable reasons for this are a decline in:
$A.$ Maternal mortality rate $(MMR)$
$B.$ Infant mortality rate $(IMR)$
$C.$ Number of people in the reproductive age group
$D.$ Death rate

The population explosion in India is due to:

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

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

Which one of the following factors has contributed most to the rapid rise of the human population in the present century?