CBSE NCERT Solutions Class 8 Science Chapter 18 Pdf - Embibe
  • Written By Ravikant_Yadav
  • Last Modified 23-06-2022
  • Written By Ravikant_Yadav
  • Last Modified 23-06-2022

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

Air and water pollution is a common topic for asking questions in the Class 8 final examination and various competitive examinations. Hence, we have provided NCERT Solutions for Class 8 Science Chapter 18: Pollution of Air and Water here to help students in understanding the concepts of the chapter from an application point of view. These CBSE NCERT Solutions of Class 8 Science Chapter 18, prepared by experts at Embibe, answer all the questions given in the NCERT Class 8 Science textbook including descriptive answer type questions, MCQs, HOTS and extra questions. You can download these solutions in PDF format for offline reference. Scroll down to find more.


NCERT Solutions For Class 8 Science Chapter 18: Pollution Of Air And Water

We have provided here the NCERT Solutions for the class 8 science chapter 18 along with a direct link to the NCERT solutions for class 8 science chapter 18 extra questions PDF download free to help the students prepare well for the exam. Finding the right solutions usually turns into a grueling task with a plethora of links available on the Internet. If you have also been struggling with the same issue then look no further. The NCERT solutions for class 8 science chapter 18 PDF along with the NCERT solutions for class 8 science chapter 18 MCQ PDF download can easily be downloaded from the embibe platform who are looking for authentic textbooks to download. 

Solutions for the questions given in the NCERT Class 8 Science Textbook will help you understand the topics better. These solutions will be very helpful during the final exam preparation. So, make the best use of these resources available for free on Embibe. Let’s have a look at the different sections and sub-sections present in Class 8 Chapter 18 – Pollution Of Air And Water:

SectionTopic Name
Ex 18.1 Air Pollution
Ex 18.2 How Does Air Get Polluted
Ex 18.3 Case Study- The Taj Mahal
Ex 18.4 Greenhouse Effect
Ex 18.5 What Can be done?
Ex 18.6 Water Pollution
Ex 18.7 How Does Water Get Polluted
Ex 18.8What is Potable Water and How is Water Purified?
Ex 18.9What can be done?

Also check,

CBSE Class 8 English SyllabusNCERT Class 8 English Book
CBSE Class 8 Maths SyllabusNCERT Class 8 Maths Book
CBSE Class 8 Science SyllabusNCERT Class 8 Science Book
CBSE Class 8 Social Science SyllabusNCERT Class 8 Social Science Book
CBSE Class 8 Hindi SyllabusNCERT Class 8 Hindi Book

NCERT Solutions For Class 8 Science Chapter 18 PDF: Solved Exercises And In-Text Questions

Here are the solutions for the in-text questions and questions present in the exercises. Download the NCERT Solutions for 8th Class Science Chapter 18 PDF. You can see that all solutions have been explained in a step-by-step manner and have been framed according to the CBSE marking scheme.

Download CBSE Class 8 Solutions for Science for other chapters from the table below:


CBSE NCERT Solutions For Class 8 Science Chapter 18: Chapter Summary

We live in a time where pollution is affecting our day-to-day lives, especially every big city is being affected by this problem. Before the industrial revolution, the quality of air and water was not a major concern. There was no need for the filtration of water or regular check on the quality of air. Delhi is considered the most polluted city in India.

Pollution has a huge effect on the health of living organisms. Air and water are two essential natural resources that are getting affected by uncontrollable human activities. Even the soil quality has been degraded due to soil pollution which has a direct impact on the agriculture sector. Air consists of a mixture of different gasses. If you measure it with respect to volume then air consists of 78% Nitrogen, 21% Oxygen, and the remaining 1% is Carbon dioxide, argon, methane, ozone, and water vapor.

In this chapter you are going to learn about Air Pollution, how air gets polluted, the different types of air pollutants, smog, CFCs, and how these things are causing respiratory problems, etc. You will see how one of the seven wonders of the world, the Taj Mahal is getting affected by air pollution. You will learn about the greenhouse effect, how global warming is happening, and what can be done in order to prevent it. Another section in this chapter is water pollution and the case study of the Ganga river will be studied here. Students will also get to know about the process of water purification.

Attempt 8th CBSE Mock Tests With Deep-improvement Analysis, Designed to Match the Actual Exam.

Here we have provided some of the frequently asked questions and answers related to this chapter:

Q1: Which of the following is not a greenhouse gas?
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Methane
(d) Nitrogen

A: The correct answer is (d) Nitrogen
Q2: Explain the differences between pure air and polluted air.
A: The air is said to be polluted when the composition of air is altered by the addition of harmful substances or gases such as sulfur dioxide, carbon monoxide, nitrogen dioxide, and particulate matter.
Q3: What are the different ways in which water gets contaminated?
A: The different ways in which the water gets contaminated are:
i) Industrial waste: The harmful chemical wastes gets released by the industries into water sources.
ii) Sewage waste: kitchen, laundry and toilets release the waste materials and this pollutes water.
iii) Agricultural chemicals: Excessive amount of pesticides and fertilizers are used by the farmers for enhancing crop production. Rains and floods carry these harmful chemicals to water bodies which results in pollute water pollution. 
Q4: Why does the increased level of nutrients in the water affect the survival of aquatic organisms?
A: An increase in the level of nutrients in the water body leads to an excessive increase in the population of algae in the water body. When these algae die, they serve as food for decomposers. A lot of oxygen is utilized in this process, consequently leading to a decrease in the level of oxygen dissolved in the water body. This in-turn causes fishes and aquatic organisms to die.

Q5: Why should I use these NCERT Solutions for Class 8 Science Chapter 18 to prepare for the exams?
A: The NCERT Solutions for Class 8 Science Chapter 18 provided here gives simple and stepwise answers to the questions present in the textbook. The solutions are helpful to understand the concepts and techniques required to answer the questions in the board exams. Students can save a lot of time by improving the time taken to answer the questions. The solutions are as per the latest CBSE guidelines.

Students can also refer to the NCERT solutions for class 8 science chapter 18 PDF download or NCERT solutions for class 8 science chapter 18 in Hindi based on their requirements to prepare well for the exam in an efficient way. 


We hope this article on Solutions for Class 8 Science Chapter 18 (Pollution of Air and Water) helps you. Refer to the solutions that we have provided in this article. 

If you have any queries, feel free to ask in the comment section below and we will get back to you at the earliest.

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