Population surge $230$ years ago was due to
Industrial revolution
Agricultural revolution
Cultural revolution
Intellectual revolution
Human population after $17$th century $A.D.$ is thought to be in
$NMEP$ stands for
The natural growth rate of population is checked by certain factors. These are known as
Lactational amenorrhoea, is a natural way of birth spacing. It is due to the high level of
$A$ : Gossypol inhibits spermatogenesis.
$R$ : Centchroman inhibits ovulation