What is the total world population at present?

Name two surgical techniques (one for the human male and another for the human female) that can be used to prevent pregnancy.

Write true (T) or false (F) for the following:

(a) Vasectomy is the surgical method of sterilization in human males……………………..

(b) Tubectomy is the placing of a diaphragm on the cervix……………………………

Define the following terms:

(a) Birth rate

(b) Death rate.

(c) The rate of growth of population.

(d) Population density.

(e) Exhaustible resource

Mention whether the following statements are true (T) or false (F). Give reason in support of your answer.

(a) The cow was the first domesticated animal. (T/F)

(b) Rapidly growing industries favoured population rise. (T/F)

(c) Present human population growth is following the arithmetic progression. (T/F)

(d) Birth rate (natality) is the number of live births per hundred people of population per decade. (T/F)

(e) Tubectomy is a popular surgical method of contraception in human males. (T/F)