Assertion (A): Ozone layer is a sort of sunscreen present high up in the atmosphere which prevents the harmful ultra-violet rays of the sun from harming us.

Reason (R): Ozone is an allotropic form of carbon which is formed in the atmosphere due to the release of chloroflurocarbons.

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.

Match the items in column I with the closely related ones in column II.

Fill in the blanks:

(i) Rubber particles and dust raised by running motor vehicles are examples of …………… pollutants.

(ii) Too frequent exposure to …………… in a medical diagnostic technique may damage chromosomes.

(iii) Thermal power plants give out a lot of …………… waste water.

(iv) Sewage is a liquid waste from ……………