Mention single most important cause of air pollution.

Natural resources are nature’s free gift to us. Name two precious natural resources.

Air has various gases in different proportion. What is the ratio of CO₂ in atmosphere?

NO_x and SO_x combinely produce a harmful pollutant along with fog. What is it? How is it harmful?

A pollutant is known to interfere with hemoglobin. Give its name.

Acid rain is caused by two major air pollutants. What are these two air pollutants?

What are the reasons of greenhouse effects?

Name the major contributing gas of global warming.

Air pollution can be prevented by adopting which measures.

Van Mahotsav has been an important step in controlling deforestation. When did Van Mahotsav start?

If dissolved oxygen of water in lake reduces, what phenomenon it leads to?

A lake has been polluted by sewage; compare the water in the lake with unpolluted water.

Sources of water pollution are categorized into two types. Which sources of pollution are easy to control?

An ambitious project to save the Ganga was launched. Mention the year in which it was launched?

The water which looks clear and has no smell will be potable. Is it necessary?

Name a filter commonly used in homes

Explain the terms:

(a) Polluted air

(b) Pollutants.

UV rays are harmful to us. How?

Various indicators suggest that water is contaminated. Mention one pollutant that also serves as indicator of water pollution.

Name the various air pollutant discharged by motor vehicle exhausts.

What causes the hardness of impure water?

What are the greenhouse gases?

Name some diseases caused by smog.

Name the substances that cause pollution.

Can high temperature kill germs?

Suggest methods by which water can be made potable at home.

The Gangotri glacier in the Himalayas has started melting. Why?

If we drink polluted water, what is likely to happen?

Carbon dioxide in air is essential as plants use it to make food. When does it become a pollutant?

What do you mean by global warming?

What are the harmful effects of acid rain?

Write the name of some water-borne diseases.

Ozone protects our environment. How?

Afforestation is essential for conservation of natural resources. Explain.

Use of excess fertilizers and pesticides affect water bodies. Do you agree? If yes, explain how.

Write some causes by which water get polluted.