State whether the following statements are true or false. lf false rewrite the correct
form of the statement by changing the first or last word only.

A.

Tubectomy is the surgical method of sterilisation in males.

Answer the following briefly:

Explain the terms:

1. Population density

Answer the following briefly:

(iii) Explain the terms:

2. Natality

Name the following:

(i) The statistical study of the human population of a region.

Explain the following terms:
(i) Natality

What are the age restrictions for marriage of boys and girls In India?

Give technical terms for the following:

(i) A method of contraception in which the sperm duct is cut and ligated

Give technical terms for the following:

(ii) Statistical study of human population

Given below are incomplete explanations of certain biological processes/terms where a keyword has been left out. Rewrite the completed explanation by inserting the keyword in the space indicated by ^.

(i) Birthrate Is the number of  ‘^’ births per thousand of the population per year.

Briefly explain the following terms:

 (iii) Death rate

Mention three reasons why the growth of population has not been appreciably checked in India.