{"id":2970,"date":"2021-12-28T12:11:26","date_gmt":"2021-12-28T06:41:26","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=2970"},"modified":"2025-06-20T15:23:52","modified_gmt":"2025-06-20T09:53:52","slug":"ncert-solutions-for-class-7-science-chapter-18-waste-water-story","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/","title":{"rendered":"NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#NCERT_Solutions_Class_7_Science_Chapter_18_Wastewater_Story_PDF_Download\" title=\"NCERT Solutions Class 7 Science Chapter 18 Wastewater Story PDF Download\">NCERT Solutions Class 7 Science Chapter 18 Wastewater Story PDF Download<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#NCERT_Class_7_Science_Chapter_18_Wastewater_Story_Exercises_Solution\" title=\"NCERT Class 7 Science Chapter 18 Wastewater Story  Exercises Solution\">NCERT Class 7 Science Chapter 18 Wastewater Story  Exercises Solution<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#1_Fill_in_the_blanks\" title=\"1. Fill in the blanks:\">1. Fill in the blanks:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#2_What_is_sewage_Explain_why_it_is_harmful_to_discharge_untreated_sewage_into_rivers_or_seas\" title=\"2. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.\">2. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#3_Why_should_oils_and_fats_be_not_released_in_the_drain_Explain\" title=\"3. Why should oils and fats be not released in the drain? Explain.\">3. Why should oils and fats be not released in the drain? Explain.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#4_Describe_the_steps_involved_in_getting_clarified_water_from_wastewater\" title=\"4. Describe the steps involved in getting clarified water from wastewater.\">4. Describe the steps involved in getting clarified water from wastewater.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#5_What_is_sludge_Explain_how_it_is_treated\" title=\"5. What is sludge? Explain how it is treated.\">5. What is sludge? Explain how it is treated.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#6_Untreated_human_excreta_is_a_health_hazard_Explain\" title=\"6. Untreated human excreta is a health hazard. Explain.\">6. Untreated human excreta is a health hazard. Explain.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#7_Name_two_chemicals_used_to_disinfect_water\" title=\"7. Name two chemicals used to disinfect water.\">7. Name two chemicals used to disinfect water.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#8_Explain_the_function_of_bar_screens_in_a_wastewater_treatment_plant\" title=\"8. Explain the function of bar screens in a wastewater treatment plant.\">8. Explain the function of bar screens in a wastewater treatment plant.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#9_Explain_the_relationship_between_sanitation_and_disease\" title=\"9. Explain the relationship between sanitation and disease.\">9. Explain the relationship between sanitation and disease.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#10_Outline_your_role_as_an_active_citizen_in_relation_to_sanitation\" title=\"10. Outline your role as an active citizen in relation to sanitation.\">10. Outline your role as an active citizen in relation to sanitation.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#11_Here_is_a_crossword_puzzle_Good_luck\" title=\"11. Here is a crossword puzzle: Good luck!\">11. Here is a crossword puzzle: Good luck!<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#12_Study_the_following_statements_about_ozone\" title=\"12. Study the following statements about ozone:\">12. Study the following statements about ozone:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#NCERT_Solutions_for_Class_7_Science_Chapter_18_Wastewater_Story_Free_PDF\" title=\"NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story Free PDF\">NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story Free PDF<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#Topics_Covered_in_NCERT_Solution_for_Class_7_Science_Chapter_18_Wastewater_Story\" title=\"Topics Covered in NCERT Solution for Class 7 Science Chapter 18 Wastewater Story\">Topics Covered in NCERT Solution for Class 7 Science Chapter 18 Wastewater Story<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#FAQs_on_NCERT_Solutions_for_Class_7_Science_Chapter_18_Wastewater_Story\" title=\"FAQs on NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story\">FAQs on NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#What_is_wastewater_story_class_7\" title=\"What is wastewater story class 7?\">What is wastewater story class 7?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#What_is_sludge_Class_7_short_answer\" title=\"What is sludge Class 7 short answer?\">What is sludge Class 7 short answer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#What_is_wastewater_short_note\" title=\"What is wastewater short note?\">What is wastewater short note?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#What_are_the_steps_involved_in_getting_clarified_water_from_wastewater_class_7th_science\" title=\"What are the steps involved in getting clarified water from wastewater class 7th science?\">What are the steps involved in getting clarified water from wastewater class 7th science?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#What_are_the_three_sources_of_wastewater_Class_7\" title=\"What are the three sources of wastewater Class 7?\">What are the three sources of wastewater Class 7?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/#Where_can_I_find_the_PDF_of_NCERT_Solutions_of_Chapter_18_of_Class_7_Science\" title=\"Where can I find the PDF of NCERT Solutions of Chapter 18 of Class 7 Science?\">Where can I find the PDF of NCERT Solutions of Chapter 18 of Class 7 Science?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>Class 7 science, chapter 18 Wastewater Story, explains how wastewater is created, treated, and handled. It teaches students about the importance of saving water and the methods used to clean and reuse wastewater. With clear explanations and fun activities, students learn why it&#8217;s important to keep things clean and hygienic for a healthy environment. The <strong><a href=\"https:\/\/infinitylearn.com\/ncert-solutions\">NCERT solutions<\/a><\/strong> in this chapter aim to encourage young people to be responsible with water and resources.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_Class_7_Science_Chapter_18_Wastewater_Story_PDF_Download\"><\/span>NCERT Solutions Class 7 Science Chapter 18 Wastewater Story PDF Download<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download the NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story in PDF format to get detailed answers and explanations about wastewater management and treatment. This chapter teaches about the importance of water conservation, the process of treating wastewater, and the need for sanitation for a healthy environment. By downloading the PDF, students can easily access detailed solutions, understand complex concepts, and improve their learning. <strong>All NCERT Solutions class 7<\/strong> are created by subject experts according to the latest <strong>CBSE syllabus<\/strong> (2025-26).<\/p>\n<h2>NCERT Class 7 Science Chapter 18 Wastewater Story  Exercises Solution<\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Fill_in_the_blanks\"><\/span>1. Fill in the blanks:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol style=\"list-style-type: lower-alpha;\">\n<li>Cleaning of water is a process of removing <strong>impurities<\/strong>.<\/li>\n<li>Wastewater released by houses is called <strong>sewage<\/strong>.<\/li>\n<li>Dried <strong>sludge<\/strong> is used as manure.<\/li>\n<li>Drains get blocked by <strong>oils<\/strong> and <strong>fats<\/strong>.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"2_What_is_sewage_Explain_why_it_is_harmful_to_discharge_untreated_sewage_into_rivers_or_seas\"><\/span>2. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sewage is wastewater that contains impurities such as human waste, food scraps, oils, and chemicals. Discharging untreated sewage into rivers or seas is harmful because it pollutes the water, harms aquatic life, spreads diseases, and disrupts ecosystems.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Why_should_oils_and_fats_be_not_released_in_the_drain_Explain\"><\/span>3. Why should oils and fats be not released in the drain? Explain.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Oils and fats should not be released into the drain because they can solidify and block the drainage pipes, leading to clogged and overflowing drains. This can cause sanitation and health problems.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Describe_the_steps_involved_in_getting_clarified_water_from_wastewater\"><\/span>4. Describe the steps involved in getting clarified water from wastewater.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The steps involved are:<\/p>\n<ol>\n<li><strong>Screening:<\/strong> Removing large solids.<\/li>\n<li><strong>Primary Treatment:<\/strong> Settling of suspended solids.<\/li>\n<li><strong>Secondary Treatment:<\/strong> Biological degradation of dissolved organic matter.<\/li>\n<li><strong>Tertiary Treatment:<\/strong> Removing remaining impurities.<\/li>\n<li><strong>Disinfection:<\/strong> Killing harmful microorganisms.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"5_What_is_sludge_Explain_how_it_is_treated\"><\/span>5. What is sludge? Explain how it is treated.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sludge is the solid waste separated during the treatment of wastewater. It is treated through processes such as digestion, dewatering, and composting to reduce pathogens and volume, making it safe for disposal or use as manure.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Untreated_human_excreta_is_a_health_hazard_Explain\"><\/span>6. Untreated human excreta is a health hazard. Explain.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Untreated human excreta is a health hazard because it contains harmful pathogens that can cause diseases such as cholera, typhoid, and hepatitis. It can contaminate water sources and the environment, leading to the spread of infections.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Name_two_chemicals_used_to_disinfect_water\"><\/span>7. Name two chemicals used to disinfect water.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Chlorine and ozone are two chemicals used to disinfect water.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Explain_the_function_of_bar_screens_in_a_wastewater_treatment_plant\"><\/span>8. Explain the function of bar screens in a wastewater treatment plant.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bar screens are used to remove large solids and debris from wastewater as it enters a treatment plant, preventing damage to equipment and ensuring smooth operation of the treatment process.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Explain_the_relationship_between_sanitation_and_disease\"><\/span>9. Explain the relationship between sanitation and disease.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Poor sanitation can lead to the spread of diseases as it provides a breeding ground for pathogens. Proper sanitation practices, such as safe disposal of waste and clean water supply, help prevent the transmission of diseases and promote public health.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Outline_your_role_as_an_active_citizen_in_relation_to_sanitation\"><\/span>10. Outline your role as an active citizen in relation to sanitation.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As an active citizen, you can promote sanitation by practicing proper waste disposal, avoiding littering, participating in cleanliness drives, educating others about hygiene, and supporting policies and initiatives for better sanitation infrastructure.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Here_is_a_crossword_puzzle_Good_luck\"><\/span>11. Here is a crossword puzzle: Good luck!<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-711553 size-full\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Class-7-Science-Chapter-18-Wastewater-Story-crossword-puzzle.jpg\" alt=\"Class 7 Science Chapter 18 Wastewater Story crossword puzzle\" width=\"513\" height=\"432\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Class-7-Science-Chapter-18-Wastewater-Story-crossword-puzzle.jpg 513w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Class-7-Science-Chapter-18-Wastewater-Story-crossword-puzzle-300x253.jpg 300w\" sizes=\"(max-width: 513px) 100vw, 513px\" \/><\/p>\n<p><strong>Solutions:<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-711554 size-full\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Untitled-design-1.jpg\" alt=\"Class 7 Science Chapter 18 Wastewater Story crossword puzzle solutions\" width=\"515\" height=\"507\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Untitled-design-1.jpg 515w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Untitled-design-1-300x295.jpg 300w\" sizes=\"(max-width: 515px) 100vw, 515px\" \/><\/p>\n<p><strong>Across<\/strong><\/p>\n<p>3. Liquid waste products<br \/>\n4. Solid waste extracted in sewage treatment<br \/>\n6. A word related to hygiene<br \/>\n8. Waste matter discharged from human body<\/p>\n<p><strong>Down<\/strong><\/p>\n<p>1. Used water<br \/>\n2. A pipe carrying sewage<br \/>\n5. Micro-organisms which causes cholera<br \/>\n7. A chemical to disinfect water<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Study_the_following_statements_about_ozone\"><\/span>12. Study the following statements about ozone:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol style=\"list-style-type: lower-alpha;\">\n<li><strong>It is essential for breathing of living organisms.<\/strong><\/li>\n<li><strong>It is used to disinfect water.<\/strong><\/li>\n<li><strong>It absorbs ultraviolet rays.<\/strong><\/li>\n<li><strong>Its proportion in air is about 3%.<\/strong><\/li>\n<\/ol>\n<p><strong>Which of these statements are correct?<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li><strong>(a), (b) and (c)<\/strong><\/li>\n<li><strong>(b) and (c)<\/strong><\/li>\n<li><strong>(a) and (d)<\/strong><\/li>\n<li><strong> All four<\/strong><\/li>\n<\/ol>\n<p><strong>Answer: <\/strong>ii) (b) and (c)<\/p>\n<p><b>Which of these statements are correct?<\/b><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>(a), (b) and (c)<\/li>\n<li>(b) and (c)<\/li>\n<li>(a) and (d)<\/li>\n<li>All four<\/li>\n<\/ol>\n<p><button><strong>NCERT Solutions for Class Science Other Chapters<\/strong><\/button><\/p>\n<ul>\n<li><strong>Chapter 1 Nutrition in Plants<\/strong><\/li>\n<li><strong>Chapter 2 Nutrition in Animals<\/strong><\/li>\n<li><strong>Chapter 3 Fibre to Fabric<\/strong><\/li>\n<li><strong>Chapter 4 Heat<\/strong><\/li>\n<li><strong>Chapter 5 Acids, Bases, and Salts<\/strong><\/li>\n<li><strong>Chapter 6 Physical and Chemical Changes<\/strong><\/li>\n<li><strong>Chapter 7 Weather, Climate, and Adaptations of Animals to Climate<\/strong><\/li>\n<li><strong>Chapter 8 Winds, Storms, and Cyclones<\/strong><\/li>\n<li><strong>Chapter 9 Soil<\/strong><\/li>\n<li><strong>Chapter 10 Respiration in Organisms<\/strong><\/li>\n<li><strong>Chapter 11 Transportation in Animals and Plants<\/strong><strong><br \/>\n<\/strong><\/li>\n<li><strong>Chapter 12 Reproduction in Plants<\/strong><\/li>\n<li><strong>Chapter 13 Motion and Time<\/strong><\/li>\n<li><strong>Chapter 14 Electric Current and Its Effects<\/strong><\/li>\n<li><strong>Chapter 15 Light<\/strong><\/li>\n<li><strong>Chapter 16 Water: A Precious Resource<\/strong><\/li>\n<li><strong>Chapter 17 Forests: Our Lifeline<\/strong><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_7_Science_Chapter_18_Wastewater_Story_Free_PDF\"><\/span>NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story Free PDF<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\t\t<div class=\"download-pdf-container\">\n\t\t\t<span class=\"title\">Do you need help with your Homework? 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wpcf7-validates-as-required wpcf7-validates-as-number\" aria-required=\"true\" aria-invalid=\"false\" \/><\/span><\/p>\n<p><span style=\"display:none;\"><span class=\"wpcf7-form-control-wrap current-page-url\"><input type=\"text\" name=\"current-page-url\" value=\"https:\/\/_:443\/surge\/wp-json\/wp\/v2\/posts\/2970\" size=\"40\" class=\"wpcf7-form-control wpcf7dtx-dynamictext wpcf7-dynamictext\" aria-invalid=\"false\" \/><\/span><\/span><\/p>\n<style>.wpcf7-list-item{margin: 0 0.5em 0 0!important;}<\/style>\n<p class=\"title\" style=\"color: #6e6e6e;font-size:14px;font-weight:400;text-decoration: un;\"><span class=\"wpcf7-form-control-wrap acceptance-agreement\"><span class=\"wpcf7-form-control wpcf7-acceptance\"><span class=\"wpcf7-list-item\"><input type=\"checkbox\" name=\"acceptance-agreement\" value=\"1\" aria-invalid=\"false\" checked=\"checked\" \/><\/span><\/span><\/span> I agree to the <a target=\"_blank\" href=\"https:\/\/infinitylearn.com\/terms\" style=\"text-decoration: underline;\">terms and conditions<\/a> and <a target=\"_blank\" href=\"https:\/\/infinitylearn.com\/privacy\" style=\"text-decoration: underline;\">privacy policy<\/a>.<\/p>\n<p><input type=\"button\" style=\"cursor:pointer;width:auto;\" class=\"il_otp_submit\" value=\"Get OTP\" onclick=\"sendCF7OTP(this, otp_phone.value, user_name.value)\"><\/p>\n<div class=\"form-submit-btn-div\" style=\"display:none;\">\n<input type=\"submit\" value=\"Download PDF\" class=\"wpcf7-form-control has-spinner wpcf7-submit download-pdf-submit\" \/>\n<\/div>\n<\/div>\n<div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div><\/form><\/div>\n\t\t\t\t\t<span class=\"pdf-link hidden\" data-pdf=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/securepdfs\/2022\/05\/WASTE-WATER-STORY.pdf\"><\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"bg-overlay\"><\/div>\n\t\t<\/div>\n\t\t<a href=\"\/surge\/?pdfemb-serveurl=https%3A%2F%2Finfinitylearn.com%2Fsurge%2Fwp-content%2Fuploads%2Fsecurepdfs%2F2022%2F05%2FWASTE-WATER-STORY.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-mobile-width=\"0\"  data-scrollbar=\"both\" data-download=\"off\" data-tracking=\"on\" data-newwindow=\"on\" data-pagetextbox=\"off\" data-scrolltotop=\"on\" data-startzoom=\"100\" data-startfpzoom=\"100\" data-download-nonce=\"5d5571dea2\" data-disablerightclick=\"on\" data-toolbar=\"top\" data-toolbar-fixed=\"on\">WASTE WATER STORY<br\/><\/a>\n<p>NCERT Solutions Class 7 Science Chapter 18 Wastewater Story Overview<\/p>\n<p>This chapter specifically deals with the issue of contaminants in the water. Water is an important resource not just for humans but for all the organisms on earth. Therefore, contaminating this natural resource has dire consequences. The main reasons for water pollution are our commercial and industrial activities. All the waste effluents that reach water bodies results in water pollution. In the long run, this can cause many diseases and health hazards for us.<br \/>\nFor instance, in Minamata City, Japan, mercury which runoff from a factory polluted the waters and the poisoning went undetected for decades. It came to notice only when the people saw their newborns had unusual birth defects.\u202fIt was found that mercury runoff had contaminated the marine ecosystem, resulting in fish species ingesting the mercury. Over a period of time, mercury accumulation in fish species got transferred into human bodies who consumed contaminated fishes. This adversely affected bodily functions and caused a lot of problems for the people and their descendants. Hence, we need to take care of such issues by preventing industrial effluents which pollutes our most precious resource \u2013 water.<\/p>\n<ul>\n<li><strong>CBSE Class 7 Science Syllabus <\/strong><\/li>\n<li><strong> CBSE Class 7 Maths Syllabus<\/strong><\/li>\n<li><strong> CBSE Class 7 English Syllabus<\/strong><\/li>\n<li><strong>CBSE Class 7 Social Science Syllabus<\/strong><\/li>\n<li><strong>CBSE Class 7 Hindi Syllabus<\/strong><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Topics_Covered_in_NCERT_Solution_for_Class_7_Science_Chapter_18_Wastewater_Story\"><\/span>Topics Covered in NCERT Solution for Class 7 Science Chapter 18 Wastewater Story<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The NCERT class 7 science chapter 18 Wastewater Story covers various topics related to wastewater and its management. Some of the key topics include:<\/p>\n<ol class=\"list-outside list-decimal marker:font-mono marker:text-sm pl-11\">\n<li><strong>Water, Our Lifeline:<\/strong> This section discusses the importance of water in our daily lives and how it is essential for maintaining the ecosystem.<\/li>\n<li><strong>What Is Sewage?:<\/strong> This topic explains the concept of sewage, which is the wastewater released by houses and industries.<\/li>\n<li><strong>Water Freshens Up-An Eventful Journey:<\/strong> This section describes the journey of water from its source to the wastewater treatment plant.<\/li>\n<li><strong>Wastewater Treatment Plant:<\/strong> The chapter discusses the processes involved in treating wastewater to make it safe for reuse or disposal.<\/li>\n<li><strong>Better Housekeeping Practices:<\/strong> This topic emphasizes the importance of adopting good housekeeping practices to reduce waste and prevent water pollution.<\/li>\n<li><strong>Sanitation and Diseases:<\/strong> The chapter highlights the relationship between sanitation and diseases caused by the presence of pathogens in contaminated water.<\/li>\n<li><strong>Alternative Arrangement for Sewage Disposal:<\/strong> This section explores various methods of sewage disposal, such as on-site sewage disposal systems and composting.<\/li>\n<li><strong>Sanitation at Public Places:<\/strong> The chapter discusses the role of public sanitation practices in maintaining hygiene and preventing the spread of diseases.<\/li>\n<\/ol>\n<p>The NCERT solutions for class 7 science Ccapter 18 &#8220;Wastewater Story&#8221; provide detailed explanations and examples to help students understand these concepts better.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs_on_NCERT_Solutions_for_Class_7_Science_Chapter_18_Wastewater_Story\"><\/span>FAQs on NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_wastewater_story_class_7\"><\/span>What is wastewater story class 7?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tIn Class 7 Science Chapter 18, the wastewater story explains how water becomes polluted, the process of wastewater treatment, and the importance of maintaining clean water sources to prevent waterborne diseases and environmental degradation.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_sludge_Class_7_short_answer\"><\/span>What is sludge Class 7 short answer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tIn Class 7, sludge refers to the solid waste that settles at the bottom during the wastewater treatment process. It is treated and can be used as manure.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_wastewater_short_note\"><\/span>What is wastewater short note?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tWastewater is water that has been used and contaminated by human activities, such as domestic use, industrial processes, and agricultural runoff. It requires treatment before being released back into the environment.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_are_the_steps_involved_in_getting_clarified_water_from_wastewater_class_7th_science\"><\/span>What are the steps involved in getting clarified water from wastewater class 7th science?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tThe steps include: Screening to remove large objects. Sedimentation to settle solid waste. Filtration to remove smaller particles. Chlorination to kill germs. Aeration to improve water quality.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_are_the_three_sources_of_wastewater_Class_7\"><\/span>What are the three sources of wastewater Class 7?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tThe three sources of wastewater are: Domestic waste from households. Industrial waste from factories. Agricultural runoff from farms.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"Where_can_I_find_the_PDF_of_NCERT_Solutions_of_Chapter_18_of_Class_7_Science\"><\/span>Where can I find the PDF of NCERT Solutions of Chapter 18 of Class 7 Science?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tYou can find the PDF of NCERT Solutions for Chapter 18 of Class 7 Science on the Infinity Learn website, where they offer comprehensive and easy-to-understand solutions for students.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is wastewater story class 7?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"In Class 7 Science Chapter 18, the wastewater story explains how water becomes polluted, the process of wastewater treatment, and the importance of maintaining clean water sources to prevent waterborne diseases and environmental degradation.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is sludge Class 7 short answer?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"In Class 7, sludge refers to the solid waste that settles at the bottom during the wastewater treatment process. It is treated and can be used as manure.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is wastewater short note?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Wastewater is water that has been used and contaminated by human activities, such as domestic use, industrial processes, and agricultural runoff. It requires treatment before being released back into the environment.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What are the steps involved in getting clarified water from wastewater class 7th science?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"The steps include: Screening to remove large objects. Sedimentation to settle solid waste. Filtration to remove smaller particles. Chlorination to kill germs. Aeration to improve water quality.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What are the three sources of wastewater Class 7?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"The three sources of wastewater are: Domestic waste from households. Industrial waste from factories. Agricultural runoff from farms.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Where can I find the PDF of NCERT Solutions of Chapter 18 of Class 7 Science?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"You can find the PDF of NCERT Solutions for Chapter 18 of Class 7 Science on the Infinity Learn website, where they offer comprehensive and easy-to-understand solutions for students.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t\t\t]\n\t}\n<\/script>\n\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Class 7 science, chapter 18 Wastewater Story, explains how wastewater is created, treated, and handled. It teaches students about the [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story","_yoast_wpseo_title":"NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story PDF","_yoast_wpseo_metadesc":"Download easy-to-understand NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story in PDF format.","custom_permalink":"study-materials\/ncert-solutions\/class-7\/science\/chapter-18-waste-water-story\/"},"categories":[19,81],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story PDF<\/title>\n<meta name=\"description\" content=\"Download easy-to-understand NCERT Solutions for Class 7 Science Chapter 18 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