Lakhmir Singh Science Class 8 Solutions Pollution of Air and Water (Chapter 18)
Lakhmir Singh Solutions for Class 8 Science Chapter 18 – Pollution of Air and Water makes you understand the solution to the harmful phenomenon of Pollution and how can one contribute to its reduction on the individual level. Other main topics discussed in the chapter include air pollution, water pollution, how does air get polluted, how does water get polluted, greenhouse effect, what can be done, what is potable water and how is water purified, and what are the steps to stop it.
All the topics in this Lakhmir Singh Solutions for Chapter 18 are explained with the examples and pictorial representation. This helps you to understand the effect of water and air pollution in a better way. Chapter 18 – Pollution of Air and Water contains around 5 exercises with a total of 54 questions. All the questions are according to the latest NCERT pattern.
These solutions are prepared by expert teachers of Science who are very experienced. Also, we have arranged the Lakhmir Singh Class 8 Science Solutions topic-wise so that you can go through them one at a time and step up the ladder of self-confidence as you go through them. You can follow the solutions anywhere, and at any time.
Important Topics for Lakhmir Singh Solutions for Class 8 Science Chapter 18
The important topics which are described in Lakhmir Singh Solutions for Chapter 18 – Pollution of Air and Water are listed below:
What is Air?
Air is a mixture of various gases that form the atmosphere of the Earth. The components of air are oxygen, nitrogen, carbon dioxide, water vapour, and other gases such as helium, argon, ozone, etc. along with dust particles, pollens, and spores.
What is Air Pollution?
The presence of various substances in a definite concentration in the air that causes harm to human beings and the environment is termed as air pollution.
How Does Air Get Polluted?
Any unwanted or dangerous constituent present in the air that drops its quality and contamination it is called air pollutants. For example, smoke is an air pollutant.
Causes of Air Pollution
There are different causes of air pollution. Some of them are listed below:
- Air pollution from Natural Sources
- Burning of fossil fuels
- Exhaust from factories
- Agricultural activities
- Pollution due to households
- Mining activities
The Greenhouse Effect
As the sun rays enter the earth’s atmosphere, some of the contamination gets redirected back into space while some of it is confined inside the earth’s atmosphere. This is possible because of several greenhouse gases in the earth’s atmosphere which can trap the heat of the sun. For example, carbon dioxide, nitrous oxide, methane, and water vapour. This phenomenon is known as the greenhouse effect.
Effects of Global Warming
Global warming leads to a higher temperature of the Earth which origins the melting of the glaciers and thus increased sea levels. Therefore, it results in drowning the areas around the sea. It also leads to thrilling weather conditions in several places of the earth. There will be an extinction of species due to global warming as the animals are not able to adjust to the changing climatic conditions of the earth.
Prevention of Air Pollution
Air pollution can be prevented with the following measures:
- Planting more and more trees
- Swapping to cleaner fuels like CNG and LPG
- Using gas stoves instead of burning coal or wood
- Increasing the usage of solar energy, wind energy, and hydropower.
- Instead of burning organic materials, they should be dumped into the compost
- Creating awareness among people about air pollution and its harmful effects
- Sharing vehicles or using public transport to reduce the number of vehicles on the road.
Water is not only essential for the survival of life on the earth but it is vital to execute several days to day activities like cleaning, bathing, cooking, washing clothes, etc. Due to these activities, several materials get mixed up in the water which makes it unsafe for additional consumption. The addition of biological, chemical, and physical constituents in water is called water pollution.
Causes of Water Pollution of Ganga
There are several causes of water pollution in the Ganga. Some of them are listed below:
- Various towns, villages, and cities release untreated sewage water, garbage, dead bodies, and other injurious substances into it.
- People use river water for washing clothes, bathing, cleaning, and they even excrete in the river. From flowers, garbage, polythene bags to idols of Gods, people through numerous things in the river. All this leads to water pollution.
- There are several industries that release toxic wastes in the river which leads to its pollution.
How to Prevent Water Pollution?
Water pollution can be prevented with the following measures:
- We should reuse water if we can.
- We should save water as much as we can save.
- More water treatment plants should be made near industrial areas.
- Industries should severely adhere to the laws and do not dispose of untreated sewage water into the rivers.
Exercise-Wise Discussion of Lakhmir Singh Solutions for Class 8 Science Chapter 18 – Pollution of Air and Water
At Instasolv, we provide step by step solutions for the questions provided in the Class 8 Science Lakhmir Singh book as per CBSE Board guidelines.
Exercise 1 – Very Short Answer Type Questions
The first exercise of the chapter has around 10 questions which are very short answer type questions based on the solution to the harmful phenomenon of Pollution and how one can contribute to its reduction on the individual level.
Exercise 2 –Short Answer Type Questions
This exercise of Chapter 9 – Reproduction in Animals has around 17 questions which are short answer type questions. Practising these questions will help you clear your concepts.
Exercise 3 –Long Answer Type Questions
This exercise of Lakhmir Singh Solutions for Class 8 Science Chapter 18 consists of a total of 7 questions which are long answer type questions.
Exercise 4 –Multiple Choice Questions (MCQs)
Exercise 4 of Lakhmir Singh Solutions for Chapter 18 consists of 15 questions that are multiple-choice questions.
Exercise 5 – Questions Based on High Order Thinking
This is the last exercise of the chapter and has around 5 questions which are based on high order thinking. Practising these questions will help you in preparing for your CBSE exams well.
If you face issues in solving the questions, you can refer to Lakhmir Singh Solutions for Chapter 18 prepared by the experts at Instasolv.
Benefits of Lakhmir Singh and Manjit Kaur Solutions for Class 8 Science Chapter 18 – Pollution of Air and Water
Clearing your concepts of the Science subject and providing you with solved questions is what the Lakhmir Singh Solutions at Instasolv deliver you with. Some other and key benefits of the solutions provided by us are listed below:
- Our Lakhmir Singh and Manjit Kaur Solutions for Class 8 Science Chapter 18 cover all the important topics of the exam.
- The solutions are easily available for you on our web page.
- The solutions are prepared by the subject experts who hold great experience in the domain.
- Solutions to the questions provide an edge because the solutions are accurate and to the point.
- Solutions arranged by a qualified team of subject experts who are well-versed with the various teaching techniques.
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