Question 2:

Just like bees, ____ also supports pollination, as pollens get blown away by ___ from plants,  cross pollination takes place.

Question 3:

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

Question 4:

Pollution from natural occurrences such as _____, _______, ______,  pollen dispersal, evaporation of organic compounds and natural radioactivity cause air pollution.

Question 5:

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 6:

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 7:

 ______ 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 8:

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

Question 9:

Emissions from _______, ________ and manufacturing activities release high levels of carbon monoxide, organic compounds, and chemicals into the air.

Question 10:

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