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

Reason (R): 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 (A): Fossil fuels are renewable and non-conventional sources of energy.

Reason (R): 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.

Assertion (A): Pesticides are the chemical substances used in agriculture to destroy pests.

Reason (R): DDT is an example of a pesticide which is widely used all over India. Pests are the enemies of crop.

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 (A): The greenhouse effect is exacerbated by the presence of nitrogen oxides and sulphur oxides in the atmosphere, intensifying the absorption of heat and contributing to global warming.

Reason (R): Oxides of nitrogen and sulphur, primarily released through industrial activities and combustion processes, amplify the greenhouse effect by enhancing the heat-trapping capacities of the atmosphere, leading to an increase in the average global temperatures.

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.