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NCERT solutions for Class 7 Science chapter 18 - Wastewater Story

Science Textbook for Class 7

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NCERT Science Class 7

Science Textbook for Class  7

Chapter 18 : Wastewater Story

Pages 228 - 229

Q 1 | Page 228

Fill in the blanks:

Cleaning of water is a process of removing _______.

Q 1.2 | Page 228

Fill in the blanks:

Wastewater released by houses is called ________.

Q 1.3 | Page 228

Fill in the blanks:

Dried _______ is used as manure.

Q 1.4 | Page 228

Fill in the blanks:

Drains get blocked by ________ and ________.

Q 2 | Page 228

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas

Q 3 | Page 228

Why should oils and fats be not released in the drain? Explain.

Q 4 | Page 228

Describe the steps involved in getting clarified water from wastewater.

Q 5 | Page 228

What is sludge? Explain how it is treated.

Q 6 | Page 228

Untreated human excreta is a health hazard. Explain.

Q 7 | Page 228

Name two chemicals used to disinfect water.

Q 8 | Page 228

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

Q 9 | Page 228

Explain the relationship between sanitation and disease.

Q 10 | Page 228

Outline your role as an active citizen in relation to sanitation.

Q 11 | Page 228

Here is a crossword puzzle: Good luck!


3. Liquid waste products

4. Solid waste extracted in sewage treatment

6. A word related to hygiene

8. Waste matter discharged from human body


1. Used water

2. A pipe carrying sewage

5. Micro-organism which causes cholera

7. A chemical to disinfect water




Q 12 | Page 229

Study the following statements about ozone:

a) It is essential for breathing of living organisms.

b) It is used to disinfect water.

c) It absorbs ultraviolet rays

d) Its proportion in air is about 3%.

Which of these statements are correct?

1) (a), (b) and (c)

2) (b) and (c)

3) (a) and (d)

4) All four

NCERT Science Class 7

Science Textbook for Class  7

NCERT solutions for Class 7 Science chapter 18 - Wastewater Story

NCERT solutions for Class 7 Science chapter 18 (Wastewater Story) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. has the CBSE Science Textbook for Class 7 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at are providing such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 7 Science chapter 18 Wastewater Story are Water Our Lifeline, Concept of Sewage, Water Freshens up - An Eventful Journey, Wastewater Treatment Plant ((WWTP)), Better House Keeping Practices, Sanitation and Disease, Alternative Arrangement for Sewage Disposal, Sanitation at Public Places, Concept of Drainage Systems.

Using NCERT Class 7 solutions Wastewater Story exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 7 prefer NCERT Textbook Solutions to score more in exam.

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