Population explosion occurs due to

The world population in $1900$ was ........ billion,which increased rapidly to ........ billion in $2000$ and reached ........ billion in $2011$.

$A$: Every sixth person in the world is an Indian.
$R$: Life expectancy depends upon average life span.

Choose the correct causes for the population growth.
$I$. Decline in death rate
$II$. Rapid increase in $MMR$ and $IMR$
$III$. Rapid decline in $MMR$ and $IMR$
$IV$. Increase in the number of people in the reproductive age group
$V$. Rapid increase in the death rate

Birth rate is directly proportional to

The minimum number of females per $1000$ males in India (as per the $2011$ Census) is found in which of the following union territories?