Page 212 - Science Class 08

D. Write True or False.
1. Air is mainly polluted by human ac vi es.

2. SPM generally reach our lungs through the nostrils and causes severe
damage to lungs.

3. Excessive use of chemical fer lizers and pes cides also cause air as well as
water pollu on.
4. Due to the rise in average temperature of the earth, polar ice-caps are
mel ng rapidly.
5. Only about 2 percent of the total available water present on the earth is
potable.
E. Very short answer ques ons.
1. What is pollu on?

2. What do you mean by SPM?
3. Name the harmful gases responsible for air pollu on.
4. Why excessive use of chlorofluoro carbon is harmful?
5. Name any three diseases caused by air pollu on.

6. What is use of wet scrubbers?
7. Name any three types of industries that release effluents in large quan es.
8. What is oil spill?

9. What is the cause of eutrophica on?
10. Write the proper es of potable water.
F. Short answer ques ons.
1. Write any three natural causes of air pollu on.

2. Why SPM is so harmful?
3. What is the cause of acid rain?
4. Write the harmful effects of green house effect.
5. Write any three steps that we can take to prevent air pollu on.

6. Write the causes of water pollu on.
7. Write any four effects of water pollu on.
8. How can we make water safe for drinking?
G. Long answer ques ons.

1. How does the excess use of fer lizers and pes cides affect water bodies?
2. Discuss the different methods available to us for making water potable by killing germs.
3. How is water treated at the waterworks to make it potable?

4. List the main pollutants of air and give the ill effects of each.

Project
Project ActivityActivityActivity
Project
Project Activity
Make a project on air and water pollu on.

212 Science-8