Question

what are the major factors responsible for population explosion?

Answer 1

birth rate death rate and migration

Answer 2

The term population explosion means the rapid increase in population which Outstrip the growth of national income and retards the per capita income. It hampers the saving and invests. The economy remains in the grip of vicious circle of poverty. The consumption and nutrition standard of the population are low. They suffer from poor health and low productivity.
The key factors in population change are natural increase (the number of births minus the number of deaths), net migration, and the interplay between these elements.