NCERT Solutions for Class 8 Science Chapter 18 Pollution of Air and Water

NCERT Solutions for Class 8 Science Chapter 18 - Pollution of Air and Water

Welcome to the Chapter 18 - Pollution of Air and Water, Class 8 Science NCERT Solutions page. Here, we provide detailed question answers for Chapter 18 - Pollution of Air and Water. The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.

Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics Pollution of Air and Water and excel in their exams. By going through these Pollution of Air and Water question answers, you can strengthen your foundation and improve your performance in Class 8 Science. Whether you’re revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.

Exercise 1

Q 1:

What are the different ways in which water gets contaminated ?

Water gets contaminated in following ways:

By untreated sewage
When sewage water is disposed into rivers.
By industrial waste.
Excessive amount of pesticides and fertilizers are used by farmers. These chemical seeps through the soil and make water contaminated.

Q 10:

Describe the threat to the beauty of the Taj Mahal.

The major threat to the beauty of Taj Mahal is acid rain. Taj Mahal is made up of marbles. When acid rain falls on it, then it reacts with the marble and form a powder like substances which is washed away by the rain. This is also called as marble cancer. The yellowing of marble is because of the acid rain.

Q 11:

Why does the increased level of nutrients in the water affect the survival of aquatic organisms?

The increased level of the nutrients in the water affect the survival of aquatic organism which may leads to the increases population of algae. The level of oxygen is decreases in the water because a lot of oxygen is utilized in this process. When the dissolved oxygen is decreased, then the organisms died who lived in the water.

Q 2:

At an individual level, how can you help reduce air pollution?

At an individual level, air pollution can be reduced in following ways:

By using public transport as much as possible.
Avoid the use of vehicles for short distances.
Avoid the use of petrol and diesel.
Use clean fuel like LPG and CNG.
Dispose the waste properly.
Control the emission of ashes from household chimneys.

Q 3:

Clear, transparent water is always fit for drinking. Comment.

No, clear and transparent water is always fit for drinking because it contains some disease causing bacteria and some microorganisms, some other dissolved contaminants etc. It might appear clean but it is still unfit for drinking. We can purify water by boiling it or by purifying it by the machines.

Q 4:

You are a member of the municipal body of your town.

Make a list of measures that would help your town to ensure the supply of clean water to all its residents.

The following steps must be taken to ensure the supply of clean water to the residents:

The area must be clean around the water pipes.
Chlorination must be used for purifying water.
The main source of the water should be maintained properly.

Q 5:

Explain the differences between pure air and polluted air.

Pure air contains 78% nitrogen, 21% oxygen, 0.03% carbon dioxide and other gases that present in the minute quantity. When some harmful substances or other poisonous gases mixed up in the air then the air become polluted. When these pollutants react with water and lead to acid rain.

Q 6:

Explain circumstances leading to acid rain. How does acid rain affect us?

Burning of fossil fuel releases a variety of pollutants such as nitrogen oxide and Sulphur oxide in the atmosphere. These reacts with the water vapours which are present in the atmosphere to form nitric acid and sulphuric acid. These acids comes down with the rain and this may leads to acid rain. Acid rain affects us in the following ways:

It damages crops
It corrode buildings
It cause health problems

Q 7:

Which of the following is not a greenhouse gas?
(a) Carbon dioxide
(b) Sulphur dioxide (c) Methane
(d Nitrogen

(d) Nitrogen

Nitrogen is not a green house gas. It is present in air 21%. Carbon dioxide, Sulphur dioxide and methane are the green house gases.

Q 8:

Describe the ‘Green House Effect’ in your own words.

Green house effect is caused by green house gases. When the average temperature of the earth increases due to the increment in the level of the carbon dioxide in the atmosphere. When solar radiations reaches the earth, some of these radiations are absorbed by Earth and released back into the atmosphere. But the green house gases trap the solar radiation and do not allow the heat to leave. The excessive increase in the temperature of Earth leads to global warming.

Q 9:

Prepare a brief speech on global warming that you have to make in your class.

When the concentration of green house gases like carbon dioxide, methane and Sulphur dioxide increases in the atmosphere. It leads to the increase in the temperature of the Earth’s surface. These gases traps the solar radiations and released back to the Earth. It keeps our planet warm. The excessive increase in the Earth’s temperature leads to global warming.

Frequently Asked Questions about Pollution of Air and Water - Class 8 Science

- 1. How many questions are covered in Pollution of Air and Water solutions?
- All questions from Pollution of Air and Water are covered with detailed step-by-step solutions including exercise questions, additional questions, and examples.
- 2. Are the solutions for Pollution of Air and Water helpful for exam preparation?
- Yes, the solutions provide comprehensive explanations that help students understand concepts clearly and prepare effectively for both board and competitive exams.
- 3. Can I find solutions to all exercises in Pollution of Air and Water?
- Yes, we provide solutions to all exercises, examples, and additional questions from Pollution of Air and Water with detailed explanations.
- 4. How do these solutions help in understanding Pollution of Air and Water concepts?
- Our solutions break down complex problems into simple steps, provide clear explanations, and include relevant examples to help students grasp the concepts easily.
- 5. Are there any tips for studying Pollution of Air and Water effectively?
- Yes, practice regularly, understand the concepts before memorizing, solve additional problems, and refer to our step-by-step solutions for better understanding.

Exam Preparation Tips for Pollution of Air and Water

The Pollution of Air and Water is an important chapter of 8 Science. This chapter’s important topics like Pollution of Air and Water are often featured in board exams. Practicing the question answers from this chapter will help you rank high in your board exams.

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