In India,if the marriage age is changed to $21$ years,then:

The main cause of population explosion in the world is:

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

As a country becomes industrialized,its population growth:

Assertion: The sex ratio of Kerala is the highest in India.
Reason: In countries like India,the population is increasing at a rapid rate.

$Statement \; 1$: Zero population growth should be achieved as early as possible to control human population.
$Statement \; 2$: This requires not two children per couple but a little more effort on reduction of this number.