NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story


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NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story: All of us use water in our homes and make it dirty. Dirty! Are you surprised? Rich in the lather, mixed with oil, black-brown water that goes down the drains from sinks, showers, toilets, laundries is dirty. It is called wastewater. This used water should not be wasted. We must clean it up by removing pollutants. Have you ever thought where the wastewater goes and what happens to it? This chapter will tell you where all this wastewater goes. Cleaning of water is a process of removing pollutants before it enters a water body or is reused. This process of wastewater treatment is commonly known as “Sewage Treatment”. It takes place in several stages.

Here are the important topics of NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story mentioned below:

18.1 Water, Our Lifeline

18.2 What Is Sewage?

18.3 Water Freshens up — an Eventful Journey

    Treatment of Polluted Water

18.4 Wastewater Treatment Plant (WWTP)

    Become an Active Citizen

18.5 Better Housekeeping Practices

18.6 Sanitation and Disease

18.7 Alternative Arrangement for Sewage Disposal

18.8 Sanitation at Public Places


Wastewater is treated in a sewage treatment plant. Treatment plants reduce pollutants in wastewater to a level where nature can take care of it. Where underground sewerage systems and refuse disposal systems are not available, the low-cost on-site sanitation system can be adopted. By-products of wastewater treatment are sludge and biogas. Open drain system is a breeding place for flies, mosquitoes, and organisms which cause diseases. We should not defecate in the open. It is possible to have safe disposal of excreta by low-cost methods.

After going through this chapter, you must be able to get the NCERT Solution of these questions which are mentioned below, as these questions are from the Science book of NCERT.

Q1. Untreated human excreta is a health hazard. Explain.

Q2. Name two chemicals used to disinfect water.

Q3. Explain the function of bar screens in a wastewater treatment plant.

Q4. Explain the relationship between sanitation and disease

If you have any problem in answering these questions or you are not getting the correct answers then don't worry, NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story is there for you to help. Solutions for NCERT Class 7 Science Chapter 18 - Wastewater Story will give you answers to all the questions which are mentioned in the NCERT book.

First of all, try to answer all the questions by yourself. Then, if you need any help, NCERT Solutions for Class 7  will suggest you the best answers which are written by our experts.

NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story - Solutions


NCERT Solutions for Class 7 Science – Chapter-wise

Chapter No.

Chapters Name

Chapter 1

Nutrition in Plants

Chapter 2

Nutrition in Animals

Chapter 3

Fibre to Fabric

Chapter 4


Chapter 5

Acids, Bases and Salts

Chapter 6

Physical and Chemical Changes

Chapter 7

Weather, Climate and Adaptations of Animals to Climate

Chapter 8

Winds, storms and cyclones

Chapter 9


Chapter 10

Respiration in Organisms

Chapter 11

Transportation in Animals and Plants

Chapter 12

Reproduction in Plants

Chapter 13

Motion and Time

Chapter 14

Electric Current and Its Effects

Chapter 15


Chapter 16

Water: A Precious Resource

Chapter 17

Forests: Our Lifeline


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NCERT Solutions for Class 7 Science


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