Question 2:

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

Question 3:

_________ helps to create energy for plants and animals. Body cells take up ________ from blood and generate energy from food.

Question 4:

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.

Question 5:

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

Question 6:

_______ acts as a universal solvent and gases such as oxygen, nitrogen, carbon dioxide and solids such as salts get readily dissolved with it.

Question 7:

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

Question 8:

Oxygen and _________ of stratosphere protect us from the ill-effects of ultraviolet light rays of sunlight.

Question 9:

Soil is made up of four components: 1. ____ such as minerals, 2._____ such as humus, 3. air and water, and 4. _____ such as bacteria, and fungi.

Question 10:

_______ can change the soil chemistry of an area, and it can also leach out the nutrients inside it.