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.

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.