Question 2:

_____ occur when air gets polluted with sulphur dioxide and nitrogen oxide. Then they mix with water particles in the air to form a toxic substance. ________ lead to increased growth of algae, which leads to eutrophication.

Question 3:

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

Question 4:

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

Question 5:

________  are also crucial for economic development of a country as they contribute to urbanisation, industrialisation, transportation and communication systems, and it becomes important that ______ are sustainably used.

Question 6:

The layer of air above the earth’s surface is called __________. 

Question 7:

Industrial waste dumped into water bodies cause chemical imbalance, leading to _____ pollution.

Question 8:

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

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:

Groundwater gets contaminated due to the use of ________, fertilisers and chemicals and causes serious health hazards to the wildlife in aquatic ecosystems such as diseases, birth defects, and reproductive failure.