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18. Wastewater Story-topic -4 Science Class 7 In English
Last Updated : 06 March 2026
Explore science Solutions for Class 7 Chapter 18. Wastewater Story Topic topic -4 in English medium.
18. Wastewater Story-topic -4 Science Class 7 In English
Last Updated : 06 March 2026
18. Wastewater Story-topic -4 Science Class 7 In English
18. Wastewater Story
topic -4
Additional Question with solution:
Que: World water Day is celebrated on.
Ans: 22 March.
Que: Mention the period proclaimed as the International Decade for action on water for life.
Ans: 2005 - 2015 is the period proclaimed as the international Decade for action on water for life.
Que: Name the three processes involved in treatment of wastewater.
Ans: Treatment of watewater involves physical, chemical and biological processes for removing different types of contaminants.
Que: Explain sewers and sewage.
Ans: Sewers are the pipes acting as a transport system that carries sewage from point of origin to the point of disposal. The wastewater released from homes, industries, hospitals, offices and other uses is called swewge.
Que: The used water should not be wasted. Do you agree? Justify.
Ans: The used water should not be wasted but it should be cleaned.
Que: Bleaching powedr is mixed in water, why? Think and give appropriate reson for it.
Ans: Bleaching powder is mixed in water to make it safe for drinking because it kills the harmful germs present in water.
Que: Natural water is the purest from of water. Explain why or why not.
Ans: Natural water is not pure always. It is because all types of water except rainwater contain salts dissolved in it. Theses salts make the water impure.
Que: Mention the role of effluent treatment plants in cities.
Ans: The effluent treatment plants filter out undissolved materials from water.
Que: Protozoa is causative organism of which waterborne disease?
Ans: Dysentry.
Que: Saniation can be improved. Explain, what step should be taken to improve it.
Ans: Low cost onsite sewage disposal system must be encouraged to improve sanitation.
Que: Give the percentage of water being activated in sludge.
Ans: About 97% of water is being activated in sludge.
Que: Wastewater is fit for human consumption or not. give reason to support your.
Ans: No, because it is dirty and has many diseases causing organisms like cholera, typhoid, etc.
Que: Name two chemicals used to disinfect wastewater.
Ans: Chlorine and ozone.
Que: Special type to toilets has been designed in aeroplanes, name it.
Ans: Vacuum toilets.
Que: Name the toilets used in areas with limited water supply.
Ans: Vermi - processing toilets.
Que: Open drain is big concern now - a - days. Justify.
Ans: Open drain is big concern for the society now - a days because they create unhygienic conditions. It provides favourable conditions to filies, mosquitoes and unhygienic conditions. It provides favourable conditions to filies, mosquitoes and other insects to breed and spread a number of diseases.
Que: Sewage also contains some nutrients Comment.
Ans: Sewage is a complex mixture which contains suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes.
The nutrients present in sewage are phosphorus and nitrogen.
Que: The terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how?
Ans: The terms like sewage, sewage and sewerage are interlinked with other because sewage is a mixture of watewater coming out of homes and other places. Sewers are pipes which carry sewage and sewerage is a network of sewage carrying pipes.
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NCERT Solutions for Class 7 science Chapter 18. Wastewater Story Topic topic -4
NCERT Solutions for Class 7 science Chapter 18. Wastewater Story Topic topic -4 are prepared to help students understand important concepts of the chapter in a simple and clear manner. These solutions are based on the latest CBSE syllabus and follow the official NCERT textbooks. Students who are searching for accurate answers and step-by-step explanations can use these solutions to improve their learning and prepare better for school exams as well as board examinations.
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NCERT books are considered the most reliable study material for CBSE students. Most examination questions are directly based on NCERT textbooks. Therefore studying NCERT Solutions for Class 7 science helps students understand the exact pattern of questions and the correct method of answering them.
By practicing the questions from Chapter 18. Wastewater Story, students can strengthen their conceptual knowledge and improve their analytical thinking skills. These solutions also help students identify the most important topics and prepare effectively for school examinations.
About Chapter 18. Wastewater Story of Class 7 science
Chapter 18. Wastewater Story is an important part of the Class 7 science syllabus. This chapter explains several key concepts which are essential for understanding the subject in detail. Students often face difficulties while solving textbook questions related to this chapter. That is why NCERT Solutions for Chapter 18. Wastewater Story are provided to explain every concept in a simple and structured way.
The explanations provided here follow the official NCERT approach so that students can easily relate them to their textbook content. By studying these answers carefully, students can learn how to structure their answers and present them clearly in exams.
Understanding Topic: topic -4
The topic topic -4 plays a significant role in Class 7 science Chapter 18. Wastewater Story. Students must understand this topic clearly because it often appears in examinations in the form of short answer or long answer questions. The solutions provided here explain the topic in a step-by-step format so that students can easily grasp the concept.
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By practicing questions from Class 7 science Chapter 18. Wastewater Story Topic topic -4, students can strengthen their conceptual understanding and improve their problem-solving skills.
Conclusion
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18. Wastewater Story-topic -4 Science Class 7 In English
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