Give the technical terms for the following :

(i) Statistical study of human population.

(ii) Number of deaths per 1000 people per year.

(iii) Number of individuals per sq. km. at any given time.

(iv) Difference between birth rate and death rate.

List any three consequences of high population density.

What are the age restrictions for marriage for boys and girls respectively in India ?

What are the three aspects covered under family welfare ?