Cause of decline of population in $1927$ was
First world war
Flood
Lack of food
Second world war
In which one of the following the birth rate is high & death rate is normal
The most densely populated city in India is
Which of the following graphs is the correct representation of the level of progesterone in a female who has been using Mala$-D$ as a method of birth control.
Castration cannot be taken as a contraceptive device, because
July $11$ is observed as