Question 2:

Air gets polluted due to presence of pollutants in the _______ and it can result from both human and natural occurrences.

Question 3:

Use of pesticides, fertilisers pollute the air by releasing harmful _______ into it.

Question 4:

Sewage, fertiliser and agricultural run-off lead to increased growth of ______, which leads to eutrophication.

Question 5:

Air pollution causes a variety of environmental effects such as _______, ______, ________, damage to crops and forests, and climate change.

Question 6:

The combustion of _______ like coal, petroleum etc is a major cause of air pollution.

Question 7:

Flow of air at high speed is called ______, and it is used to generate power by installation of  turbines.

Question 8:

 ______ is the ultimate source of all food production, since plants form the base of all ecological food chains and plants grow in ______ and derive nutrition from it. Humans depend on ______ for food, clothing, furniture, medicine etc. Even other animals, insects receive food by grasing on plants.

Question 9:

Soil contents like ______, ______, sand, etc. are widely used for construction of homes, buildings, roads etc.

Question 10:

The air that we breathe is present in the first zone of earth known as _______. It is 10 to 12 km from the surface of the earth.