Page 84 - Viva ICSE Science 4 : E-book

3. In this particles are very loosely packed. ______________

4. This fuel is used in vehicles to reduce the release of
harmful gases. ______________

5. This gas is important for burning. ______________

D. Match the following.

Column A Column B

1. Plants (a) breathe through spiracles

2. Fish (b) breathe through nose

3. Insects (c) breathe through stomata
4. Humans (d) breathe through gills

E. Answer the following questions.

1. What is the composition of air?

2. What are the properties of air?

3. What are the causes of air pollution?

4. What are the eff ects of air pollution? State four measures to keep air clean.

5. Describe an experiment to prove that air occupies space and has weight.

6. Describe an experiment to prove that air supports burning.

THINK AND ANSWER

1. We have learnt that nitrogen is the most abundant gas present in the air. Then why do
we breathe in oxygen but not nitrogen?
2. Name any two musical instruments that make sound when you blow air into them.

TALK ABOUT

Notice the cause of air pollution you see on your way to school and while going back home.
Discuss these in class. Also suggest ways in which the air pollution can be prevented.

LINK AND LEARN

On a chart paper, draw any four pictures showing the importance of air in our daily life.

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