Assertion. Tubectomy is a temporary method of contraception for males in which the sperm ducts are cut and ligated with a nylon thread.

Reason. Tubectomy closes the passage of the sperms. The sperm duct is also known as vas deferens, which stores the sperms for some days during which they mature and become motile.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion. Fossil fuels are renewable and non-conventional sources of energy.

Reason. The underground reserves of coal and petroleum are depleting fast. People should look at other non-conventional sources of energy like solar energy, tidal energy, etc. for their use.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

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

Mention whether the following statements are true (T) or false (F).

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

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

(c) Cow was the first domesticated animal.

(d) Rapidly growing industries favoured population rise.

(e) Present human population growth is following arithmetic progression.

(f) Birth rate (natality) is the number of live births per hundred people of population per decade.

(g) Tubectomy is a popular surgical method of contraception in human males.