NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story
NCERT Solutions for Class 7 Science Chapter 18 have been provided in the article below for the students of CBSE Class 7 Science. Those interested can check the detailed solutions on this page
Jasdeep Bhatia8 Jan, 2024
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NCERT Solutions for Class 7 Science Chapter 18
NCERT Solutions for Class 7 Science Chapter 18: NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story is essential for 7th-grade students. These solutions aim to help students understand the Wastewater Story easily and quickly. All the solutions are created by subject experts following the latest CBSE syllabus (2023-2024). Regular practice of these solutions is crucial for effective exam preparation. NCERT Solutions for Class 7 Science Chapter 18 highlight the significance of water in everyone's life. The chapter explains how clean water can turn into dirty water and suggests measures to reuse and recycle wastewater. Each section in NCERT Science Class 7 Science Chapter 18 helps students understand important concepts.NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story Overview
NCERT Solutions for Class 7 Science Chapter 18 focus on issues related to contaminants in the natural resource of water and their serious consequences. It discusses activities causing pollution and their negative impact on health. The chapter also addresses the conversion of wastewater from human activities leading to soil and water pollution. It emphasises the use of a Wastewater Treatment Plant to reduce pollutants in nature and the adoption of low-cost on-site Sanitation Systems when sewage systems are unavailable. However, the by-products of the Wastewater Treatment Plant include Biogas and Sludges. The chapter also mentions the negative consequences of an Open Drainage System, which harbours organisms, flies, and mosquitoes causing diseases. Therefore, the chapter stresses the importance of water, proper waste disposal, the use of Wastewater Treatment Plants, sanitation, and the consequences of open defecation. NCERT Solution of Class 7 Science Chapter 18 acts as a guide for students, listing important measures to reduce water pollution and contamination. The chapter emphasises the importance of maintaining water balance in the ecosystem and raises awareness about sanitation among students.NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story
NCERT Solutions for Class 7 Science Chapter 18 serves as a reliable reference, providing students with a concise yet comprehensive grasp of the Wastewater Story. These solutions cover key concepts and topics, making them an invaluable resource for students preparing for annual exams or intermediate tests. Accessing the NCERT Science Book Class 7 Science Chapter 18 aids in gaining a thorough understanding of essential concepts. Students can enhance their preparation by accessing and utilising these solutions| CBSE Syllabus Class 7 | |
| CBSE Class 7 English Syllabus | CBSE Class 7 Math Syllabus |
| CBSE Class 7 Social Science Syllabus | CBSE Class 7 Science Syllabus |
- Waste water is filtered using bar screens to eliminate large materials such as rags, twigs, cans, plastic packets, napkins, and so on.
- Water is routed through a grit and sand removal tank, allowing sand, grit, and pebbles to settle.
- The water is then allowed to settle in a big settling tank, where solid faeces known as sludge is removed using a scarper.
- Air is poured into the clarified water to assist aerobic bacteria in growing and consuming wastes.
- Water of this kind is dumped into rivers or ponds.
Q4. What is sludge? Explain how it is treated.
Ans:
Sludge is a solid waste material that settles in secondary water treatment. Generally, it is scraped out from the bottom. The clarified water is then discharged. Sludge is stored in a separate tank and treated with anaerobic bacteria, which creates biomass that can be used as bio manure.
Q5. Untreated human excreta is a health hazard. Explain.
Ans:
Millions of bacteria live in the human stomach and expel with the faeces. If human excreta is dumped directly into the soil or water, it can pollute both the water and the soil. Under favourable conditions, the bacteria divide and multiply, and when the water reaches the earth table, it might affect a bigger population that consumes it. It can induce water-borne diseases such as typhoid and cholera.
Q6. Name two chemicals used to disinfect water.
Ans:
Water disinfection involves removing or deactivating pathogenic bacteria, as well as killing them. Microorganisms are rendered inactive, putting an end to their development and reproduction. If germs are not removed from drinking water, humans will develop unwell from drinking water. Chlorine and ozone are the two chemicals used in water disinfection.
Q7. Explain the function of bar screens in a wastewater treatment plant.
Ans:
When waste water is pumped through bar screens, it serves as a large screen. In the first step of cleaning water, large materials such as rags, twigs, cans, plastics, and napkins are removed.
Q8. Explain the relationship between sanitation and disease.
Ans:
Sanitation is a public health issue. Sanitation includes the prevention of disease, the provision of safe drinking water, and the proper disposal of garbage. Diseases are spread when cleanliness standards are not met. Dirty water serves as a breeding ground for mosquitoes that transmit diseases. Improper sewage disposal can result in water-borne sickness. As a result, sanitation is the utmost pathogen rescue and can result in a disease-free environment.
Q9. Outline your role as an active citizen in relation to sanitation.
Ans:
All humans have a responsibility to play in keeping our environment clean as engaged and knowledgeable citizens. We can begin from home. Adopting excellent sanitation techniques should be a way of life for all of us. Our energy, ideas, and excitement can have an impact on others. And encourage people to maintain a healthy living environment for the benefit of society.
Q10. Here is a crossword puzzle: Good luck!
Across
1. Liquid waste products.
2. Solid waste extracted in sewage treatment.
3. A word related to hygiene
4. Waste matter discharged from the human body.
Down
1. Used water.
2. A pipe carrying sewage.
3. Micro-organisms which cause cholera.
4. A chemical to disinfect water.
Ans:
Across:
1.
Liquid waste product- Sewage
2.
Solid waste extracted in sewage treatment- Sludge
3.
A word related to hygiene- Sanitation
4.
Waste matter discharged from human body- Excreta
Down:
1. Used water- wastewater 2. A pipe carrying sewage- Sewer 3. Microorganisms which causes cholera- Bacteria 4. A chemical to disinfect water- Ozone Study the following statements about ozone:1. It is essential for the breathing of living organisms.
2. It is used to disinfect water.
3. It absorbs ultraviolet rays.
4. Its proportion in the air is about 3%.
Which of these statements are correct?- a., b. and c.
- b. and c.
CBSE Board Exam Centre List 2024
NCERT Solutions for Class 7 Science Chapter 18 WasteWater Story Topics Covered
The Chapter covers several key points, including:- Wastewater is water that's been contaminated from various sources and needs proper treatment before use. All discharges from places like homes, hospitals, businesses, and industries are known as effluent.
- Wastewater includes agricultural, horticultural, stormwater, urban runoff, and aquaculture effluent.
- Effluent is the sludge or sewage released into water bodies, either directly or after treatment.
- Contamination occurs when one substance, like bacteria, makes another substance impure, such as contaminating food or water.
- Sewage is liquid waste that pollutes water and soil, containing suspended materials, organic and inorganic pollutants, nutrients, saprophytic and disease-causing bacteria, and other microbes.
- Wastewater treatment plants remove contaminants to a level sustainable for the environment.
- Low-cost on-site sanitation is an alternative method for waste treatment where underground sewerage and trash disposal systems aren't available.
- Sludge and biogas are by-products of wastewater treatment.
- Open drains shouldn't be used for defecation as they become breeding grounds for flies, mosquitoes, and disease-causing organisms.
- Proper disposal of excreta is crucial, especially in rural and developing areas, using low-cost methods.
Benefits of NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story
NCERT solutions for Class 7 Science, Chapter 18, or any other chapter, offer several advantages: 1. Aligned with Curriculum: NCERT solutions are designed to be in sync with the CBSE curriculum. They cover the topics and concepts outlined in the official curriculum, ensuring that students are well-prepared for exams. 2. Accuracy and Credibility: NCERT is a reputable organisation, and its solutions are well-researched and accurate. Students can rely on these solutions for correct information and answers. 3. Clear Explanation: The solutions provided in NCERT textbooks are written in a clear and concise manner. This helps students understand complex concepts more easily, making the learning process more effective. 4. Structured Approach: The solutions are presented in a structured format, helping students organise their thoughts and understand the logical flow of concepts. This can enhance their problem-solving skills. 5. Exam Preparation: NCERT solutions are an excellent resource for exam preparation. They provide a comprehensive review of the topics covered in each chapter, helping students revise and practice before exams. 6. Additional Practice Material: NCERT solutions often include additional exercises and questions for practice. This allows students to reinforce their understanding of the concepts and improve their problem-solving skills. 7. Language Clarity: The language used in NCERT solutions is simple and easy to understand. This is particularly beneficial for students who may find certain scientific terms or concepts challenging. 8. Encourages Self-Study: NCERT solutions are designed to be student-friendly, encouraging self-study. Students can use these solutions independently, enhancing their ability to learn and apply concepts without constant guidance. 9. Conceptual Understanding: Instead of rote memorization, NCERT solutions emphasise conceptual understanding. This approach fosters a deeper comprehension of scientific principles, which is crucial for long-term retention and application. 10. Widely Accepted: NCERT textbooks and solutions are widely accepted and used across schools in India. This ensures uniformity in the educational system and allows students to have a consistent learning experience.NCERT Solutions for Class 7 Science Chapter 18 FAQs
Define Sludge and Elaborate on its Treatment Process.
Sludge is a semi-solid residue that forms during the wastewater treatment process. Its treatment involves various steps like sedimentation, digestion, and dewatering to minimise volume and mitigate environmental impact.
Explain the Relationship Between Sanitation and the Spread of Diseases.
Inadequate sanitation facilitates disease transmission by allowing pathogens to spread through contaminated water and poor hygiene practices.
How Many Queries are Covered in NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story?
There are a total of 12 questions addressed in NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story.
What's the Count of Questions with Extended Solutions (more than 180 words) in NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story?
NCERT Solutions for Class 7 Science Chapter 18 - Wastewater Story contains 4-8 questions with detailed solutions exceeding 180 words.
Define Wastewater in the Context of Chapter 18 in Class 7 Science.
Wastewater, as portrayed in Chapter 18 of Class 7 Science, is water that has been utilised and contaminated with impurities, necessitating proper treatment before safe disposal.
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