Page 208 - New Medley 5 Semester 2

C. Write True or False.

1. Air is white in colour.

2. Burning fossil fuels releases oxygen in the atmosphere.

3. e nitrogen and oxygen are air pollutants.

4. Trees remove carbon dioxide from the air and release oxygen.

D. Answer these questions.
1. What is the composition of air?

2. What are the uses of air pressure?

3. What do you understand by air pollution? What are its main causes?

4. State 5 main e ects of air pollution. How can air pollution be reduced?

E. Subject Integration—EVS

How will you prove that soil contains air?

Think and Answer
• Critical Thinking
1. We should prefer using CNG vehicles. Why?

2. Automobiles need a regular check for the e cient working. Why?
3. Factories and industries are not allowed to be established in residential areas. Why?

Let Us Do • Creativity/Communication

1. Put a drop of wet colour on a hard paper. Using a straw, blow on the wet colour.

How are you able to spread the colour without touching it?
2. What would have been the state of the planet earth, if there was no oxygen on it?

Discuss in the class.

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