Question

what could be the reason for the speed with which increases took place after indian independence

Answer 1

The reason why the increases in speed took place that at that time the major political leaders were in a very massive concern about the nation's development. So In order to make the nation better against even the Britishers invasions they had to take that step.

The following points :

a. There has been substantial increase in India's population since Independence .
b. The rise in population can be attributed to increase in birth rate.In India birth rates have always been on a higher side, due to lack of awareness of family planning, illiteracy.
c. There has been a decline in the death rates due to better health facilities etc.
d. Increased migration has largely impacted composition and distribution of population, Internal migration from rural to urban areas in search of better employment opportunities  has increased the population of cities and towns
e. There has also been substantial growth in cities.
etc.