NCERT Solutions for Class 8 Science Chapter 18: All CBSE Class 8 students who are looking for NCERT Solutions for Science Chapter 18 can refer to this article. All solutions for the Pollution of Air and Water chapter are prepared by top academic experts at Embibe. Moreover, these solutions have been written in an easy language so that any 8th class student can understand it. The best part is that we have provided the Class 8 Science Solutions for Chapter 18 for free.
NCERT Solutions for Class 8 Science for this chapter includes questions and answers on air pollution, greenhouse effect, water pollution, waste management, how pollution can be reduced, etc. The answers are provided for descriptive type questions, MCQs, HOTS, and extra questions.
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:
| Section | Topic 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 18.8 | What is Potable Water and How is Water Purified? |
| Ex 18.9 | What can be done? |
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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:
- Chapter 1 – Crop Production and Management
- Chapter 2 – Microorganisms: Friend and Foe
- Chapter 3 – Synthetic Fibres and Plastics
- Chapter 4 – Materials: Metals and Non-Metals
- Chapter 5 – Coal & Petroleum
- Chapter 6 – Combustion And Flame
- Chapter 7 – Conservation of Plants and Animals
- Chapter 8 – Cell – Structure and Functions
- Chapter 9 – Reproduction in Animals
- Chapter 10 – Reaching the Age of Adolescence
- Chapter 11 – Force and Pressure
- Chapter 12 – Friction
- Chapter 13 – Sound
- Chapter 14 – Chemical Effects Of Electric Current
- Chapter 15 – Some Natural Phenomena
- Chapter 16 – Light
- Chapter 17 – Stars and the Solar System
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.
FAQs Related To NCERT Solutions For Class 8 Science Chapter 18
Here we have provided some of the frequently asked questions related to this chapter:
(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.
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.
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.
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