The reasons of uneven distribution of population in India are:
(i) Topography
(ii) Climate
(iii) Basic Facilities such as education, health, electricity etc.
(iv) Employment opportunities

Increased facilities provided to live a comfortable life and better medical facilities that have brought down the death rate is the cause for an increase in people being added every decade despite the decline in growth rate.

The reasons for such (sex ratio) variations due to:

→ Society structure: Indian society is male dominant society. The people here have remained in favour of a male child leading to female foeticide and dowry problems which make people think of female children as a burden.

→ Illiteracy: India's literacy level is very low. They don't have proper education and discriminate between male and female children. In states like Kerala there are well-educated people who also follow matriarchal society rules and sex ratio in Kerala is 1058 females per 1000 males.

Migrations change the number, distribution and composition of the population in:
(a) the area of departure

(b) both the area of departure and arrival
(c) the area of arrival 

(d) none of the above

ANS (b) both the area of departure and arrival

A large proportion of children in a population is a result of
(a) high birth rates 
(b) high life expectancies
(c) high death rates 
(d) more married couples

ANS (a) high birth rates