NCERT solutions for class 8 science chapter 18 pollution of air and water: Air and Water are two of the most important natural resources for the survival of humans and other living organisms. In the solutions for NCERT class 8 science chapter 18 pollution of air and water, you will get questions based on the pollution of water and air, which is very important to know. This chapter describes the importance of air and water in human life and how it has been depreciated over decades. The study of this chapter along with appropriate answers is important as far as your CBSE class 8 exams are concerned. You must have thought that why Tajmahal which is otherwise very beautiful looks dusty from outside. After studying the chapter, you will be able to solve such queries that you have in a day to day life and also with the help of CBSE NCERT solutions for class 8 science chapter 18 pollution of air and water. In chapter pollution of air and water class 8 CBSE, you will learn how global warming occurs. If you need help in finding solutions of NCERT book to any other class, then don't worry NCERT solutions will help you out. In the below image you can see, how these industries pollute our environment.
NCERT solutions for class 8 science chapter 18 pollution of air and water: Important Topics
18.1 Air Pollution
18.2 How does air get polluted?
18.3 Case Study: The Taj Mahal
18.4 Greenhouse Effect
18.5 What can be done
18.6 Water Pollution
18.7 How does water get polluted
18.8 What is Potable water and how it is purified?
18.9 What can be done?
NCERT solutions for class 8 science chapter 18 pollution of air and water: Solved Exercise Questions
Q1 . What are the different ways in which water gets contaminated?
The different ways in which water gets contaminated are:
- Sometimes untreated sewage is thrown directly into rivers. It contains food wastes, detergents, microorganisms, etc.
- Many industries discharge harmful chemicals into rivers and streams, causing the pollution of water Examples are oil refineries, paper factories, textile and sugar mills, and chemical factories.
- Pesticides and weedicides these chemicals dissolve in water and are washed into water bodies from the fields. They also seep into the ground to pollute ground water.
Q2 . At an individual level, how can you help reduce air pollution?
One can take these extra steps to reduce air pollution:
(i) Try traveling in public vehicles such as bus, metro, railways etc.
(ii) Try not to burn trash or any other material which would then releases harmful gases. Instead, you can dump it in the soil.
(iii) Switch to LPG or other stoves rather than cooking food in wood stoves.
(iv) Or the best is to plant a tree.
Solutions for NCERT class 8 science chapter 18 pollution of air and water:
Q5 . Explain the differences between pure air and polluted air.
Differences between Pure air and Polluted air are:
It is free from various harmful gases and germs
It contains various types of germs and impurities which are very harmful to people.
If inhaled, we do not get any harm to our system and staying healthy.
If inhaled, it may cause respiratory problems like asthma, etc. Not healthy
Q6 . Explain circumstances leading to acid rain. How does acid rain affect us?
Pollutants like sulphur dioxide and nitrogen dioxide react with the water vapour present in the atmosphere to form sulphuric acid and nitric acid respectively. The acids drop down with rain, making the rain acidic. This is called acid rain.
Acid rain affects us in many ways:
(i) Acid rain corrodes the marble of the monument.
(ii) Acidic rain when flows through the soil leach out the aluminium present and flows into the rivers. It is harmful to aquatic animals.
(iii) Acid rain also removes minerals and nutrients from the soil that trees need to grow.
Q8 . Describe the 'Green House Effect' in your own words.
The trapping of radiations by the earth's atmosphere is known as the greenhouse effect. Without this process, life would not have been possible on earth. Life is now threatened because of an excess of CO2 in the air and is one of the gases responsible for this effect. Some greenhouse gases are carbon dioxide, sulphur dioxide, etc.
NCERT solutions for class 8 science chapter 18 pollution of air and water:
Q9 . Prepare a brief speech on global warming. You have to deliver the speech in your class.
Greenhouse gases like carbon dioxide, methane, nitrous oxide trap heat and do not allow it to escape into space. As a result, the average temperature of the earth’s atmosphere is gradually increasing. This is called global warming.
Deforestation leads to an increase in the amount of carbon dioxide in the air because the number of trees that consume carbon dioxide is reduced. Human activities, thus, contribute to the accumulation of carbon dioxide in the atmosphere.
Global warming is a serious threat: causing sea levels to rise in many coastal areas, also result in wide-ranging effects on rainfall patterns, agriculture, forests, plants, and animals.
Q10 . Describe the threat to the beauty of the Taj Mahal.
The industries located in and around Agra have been responsible for producing pollutants like sulfur dioxide and nitrogen dioxide. These gases react with the water vapour present in the atmosphere to form sulphuric acid and nitric acid. The acids drop down with rain, making the rain acidic. Acid rain corrodes the marble of the monument. The phenomenon is also called “ Marble cancer ”. Suspended particulate matter, such as the soot particles emitted by an oil refinery, has contributed towards the yellowing of the marble.
The Supreme Court has taken several steps to save the Taj. It has ordered industries to switch to cleaner fuels like CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas). Moreover, the automobiles should switch over to unleaded petrol in the Taj zone.
CBSE NCERT solutions for class 8 science chapter 18 pollution of air and water:
Q11 . Why does the increased level of nutrients in the water affect the survival of aquatic organisms?
The increased level of nutrients in the water affects the survival of aquatic organisms because there is an increase in the algae formation, which when dies to form as food for the decomposers and it takes a lot of oxygen from the water hence decreasing the dissolved oxygen in the water. This may affect the aquatic animals as they take in dissolved oxygen.
After going through this chapter you must prepare every question of the NCERT science exercises. You can also refer to NCERT solutions for class 8 science chapter 18 pollution of air and water, to get a better understanding of what kind of questions are asked in exams.
NCERT Solutions For Class 8 Science- Chapter-wise
NCERT Solutions For Class 8: Subject-Wise
What are the benefits of NCERT solutions for class 8 science chapter 18 pollution of air and water:
- NCERT is the base of your learning.
- NCERT solutions for class 8 science chapter 18 pollution of air and water will also boost your knowledge.
- Solutions for NCERT class 8 science chapter 18 pollution of air and water will also help you to understand all the concepts easily.
- You will get all the answers to this chapter and it will help you to score good marks in your school exam.