Page 34 - ICSE Science 3 : E-book

2. Breathing in polluted air has good eff ect on the health of
humans and animals.

3. Our nose consists of fi ne hair and mucus that trap dust

particles and germs.

4. Respiratory system consists of group of organs that help us
to breathe in and out.

5. Diaphragm is also called throat or trachea.

D. Answer the following questions.

1. Defi ne organ and organ system.

2. Draw a neat labelled diagram of the human respiratory system.

3. Explain the process of breathing in your own words.

4. What is air pollution? Write the causes and damaging (harmful) eff ects of
air pollution on the surroundings.

5. Write any fi ve ways to reduce air pollution in the surroundings.

THINK AND ANSWER

1. Why do you think we should inhale fresh air and not dirty air?

2. Why do we practise deep breathing during yoga or meditation?

TALK ABOUT

1. Discuss and share your views on the need for proper breathing in humans.

2. Why do we need to save our surroundings from getting polluted due to smoke and
harmful gases? Discuss the causes and eff ects of air pollution. Also, suggest two
eff ective ways you think can reduce this problem.

LINK AND LEARN

Using clay, make a small model of any one of the organs you have studied in this lesson.

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