Population in India is not evenly distributed many factors are responsible for this.
- Fertility of the soil. The states in which there is a large fertile area the density of population is high. U.P. and Bihar are such states.
- Amount of rainfall. The density of population is higher in regions of abundant rain. In northern India the amount of rainfall goes on decreasing from east to west. The density of population also goes on decreasing in the same direction.
- Climate. Wherever the climate is congenial the density of population will be high. In Assam even though there is abundant rainfall but the density of population is low because the climate is unhealthy. The malaria is always there is an epidemic form.
- Developed means of transportation. With the development of means of transportation the business makes rapid progress and the density of population increases. The reason for high density of population in U.P., Bihar and West Bengal is the development of means of transportation.