{"id":28460,"date":"2022-01-29T15:53:58","date_gmt":"2022-01-29T10:23:58","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=28460"},"modified":"2022-01-29T15:53:58","modified_gmt":"2022-01-29T10:23:58","slug":"wastewater-story-class-7-extra-questions-science-chapter-18","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material-extra-question\/class-7\/wastewater-story-class-7\/science\/extra-questions-science-chapter-18","title":{"rendered":"Wastewater Story Class 7 Extra Questions Science Chapter 18"},"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-material-extra-question\/class-7\/wastewater-story-class-7\/science\/extra-questions-science-chapter-18\/#Wastewater_Story_Class_7_Extra_Questions_Science_Chapter_18\" title=\"Wastewater Story Class 7 Extra Questions Science Chapter 18\">Wastewater Story Class 7 Extra Questions Science Chapter 18<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-material-extra-question\/class-7\/wastewater-story-class-7\/science\/extra-questions-science-chapter-18\/#Wastewater_Story_Class_7_Science_Extra_Questions_Very_Short_Answer_Type_Questions\" title=\"Wastewater Story Class 7 Science Extra Questions Very Short Answer Type Questions\">Wastewater Story Class 7 Science Extra Questions Very Short Answer Type Questions<\/a><\/li><li 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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-material-extra-question\/class-7\/wastewater-story-class-7\/science\/extra-questions-science-chapter-18\/#Wastewater_Story_Class_7_Science_Extra_Questions_Miscellaneous_Questions\" title=\"Wastewater Story Class 7 Science Extra Questions Miscellaneous Questions\">Wastewater Story Class 7 Science Extra Questions Miscellaneous Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Wastewater_Story_Class_7_Extra_Questions_Science_Chapter_18\"><\/span>Wastewater Story Class 7 Extra Questions Science Chapter 18<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Wastewater_Story_Class_7_Science_Extra_Questions_Very_Short_Answer_Type_Questions\"><\/span>Wastewater Story Class 7 Science Extra Questions Very Short Answer Type Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nWastewater is fit for human consumption or not. Give reason to support your answer.<br \/>\nAnswer:<br \/>\nNo, because it is dirty and has many diseases causing organisms like cholera, typhoid, etc.<\/p>\n<p>Question 2.<br \/>\nName two chemicals used to disinfect wastewater.<br \/>\nAnswer:<br \/>\nChlorine and ozone.<\/p>\n<p>Question 3.<br \/>\nSpecial type of toilets has been designed in aeroplanes, name it.<br \/>\nAnswer:<br \/>\nVacuum toilets.<\/p>\n<p>Question 4.<br \/>\nName the toilets used in areas with limited water supply.<br \/>\nAnswer:<br \/>\nVermi-processing toilets.<\/p>\n<p>Question 5.<br \/>\nName the type of toilets which are most suitable for holding an outdoor music festival in a park.<br \/>\nAnswer:<br \/>\nChemical toilets.<\/p>\n<p>Question 6.<br \/>\nName two things that can be made from sludge extracted during treatment of sewage.<br \/>\nAnswer:<br \/>\nBiogas and manure.<\/p>\n<p>Question 7.<br \/>\nThe Eucalyptus trees are planted along sewage ponds. Give reason. [HOTS]\nAnswer:<br \/>\nThe Eucalyptus trees are planted along sewage ponds because these trees absorb all surplus wastewater rapidly and release pure water vapour into the atmosphere.<\/p>\n<p>Question 8.<br \/>\nOne can avoid the addition of the load in WWTP. Justify.<br \/>\nAnswer:<br \/>\nBy following proper sanitation and house-keeping practices, by creating less waste at an individual level, we can avoid the addition of the load in wastewater treatment plant.<\/p>\n<p>Question 9.<br \/>\nName two inorganic impurities present in sewage. [NCERT Exemplar]\nAnswer:<br \/>\nInorganic impurities present in sewage are nitrates and phosphates.<\/p>\n<p>Question 10.<br \/>\nMention the use of dried sludge.<br \/>\nAnswer:<br \/>\nIt is used as manure, thus returning organic matter and nutrients to the soil.<\/p>\n<p>Question 11.<br \/>\nIn which type of toilets, human excreta is treated by earthworm?<br \/>\nAnswer:<br \/>\nVermi-processing toilets.<\/p>\n<p>Question 12.<br \/>\nGive some examples of onsite sewage disposal systems.<br \/>\nAnswer:<br \/>\nChemical toilets, septic tanks, composting pits, etc.<\/p>\n<p>Question 13.<br \/>\nSewage contains some organic impurities in it. Name them.<br \/>\nAnswer:<br \/>\nHuman faeces, animal wastes, oil, urea pesticides, herbicides, fruits and vegetables are the organic impurities present in sewage.<\/p>\n<p>Question 14.<br \/>\nMention the common process of cleaning of wastewater.<br \/>\nAnswer:<br \/>\nSewage treatment.<\/p>\n<p>Question 15.<br \/>\nWorld Water Day is celebrated on<br \/>\nAnswer:<br \/>\n22 March.<\/p>\n<p>Question 16.<br \/>\nMention the period proclaimed as the International Decade for action on Water for Life.<br \/>\nAnswer:<br \/>\n2005-2015 is the period proclaimed as the International Decade for action on Water for Life.<\/p>\n<p>Question 17.<br \/>\nName the three processes involved in treatment of wastewater.<br \/>\nAnswer:<br \/>\nTreatment of wastewater involves physical, chemical and biological processes for removing different types of contaminants.<\/p>\n<p>Question 18.<br \/>\nExplain sewers and sewage.<br \/>\nAnswer:<br \/>\nSewers 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 sewage.<\/p>\n<p>Question 19.<br \/>\nThe used water should not be wasted. Do you agree? Justify.<br \/>\nAnswer:<br \/>\nThe used water should not be wasted but it should be cleaned.<\/p>\n<p>Question 20.<br \/>\nBleaching powder is mixed in water, why? Think and give appropriate reason for it. [HOTS]\nAnswer:<br \/>\nBleaching powder is mixed in water to make it safe for drinking because it kills the harmful germs present in water.<\/p>\n<p>Question 21.<br \/>\nNatural water is the purest form of water. Explain why or why not.<br \/>\nAnswer:<br \/>\nNatural water is not pure always. It is because all types of water except rainwater contain salts dissolved in it. These salts make the water impure.<\/p>\n<p>Question 22.<br \/>\nMention the role of effluent treatment plants in cities.<br \/>\nAnswer:<br \/>\nThe effluent treatment plants filter out undissolved materials form water.<\/p>\n<p>Question 23.<br \/>\nProtozoa is causative organism of which waterborne disease?<br \/>\nAnswer:<br \/>\nDysentry.<\/p>\n<p>Question 24.<br \/>\nIn the chemical process of water treatment, water is treated with some chemicals. Describe chlorination in light of it. [HOTS]\nAnswer:<br \/>\nChlorination is the process of adding chlorine (chemical) in water to make it safe for drinking.<\/p>\n<p>Question 25.<br \/>\nSanitation can be improved. Explain, what step should be taken to improve it.<br \/>\nAnswer:<br \/>\nLow cost onsite sewage disposal system must be encouraged to improve sanitation.<\/p>\n<p>Question 26.<br \/>\nGive the percentage of water being activated in sludge.<br \/>\nAnswer:<br \/>\nAbout 97% of water is being activated in sludge.<\/p>\n<p>Question 27.<br \/>\nAnimal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage. [NCERT Exemplar]\nAnswer:<br \/>\nFruits and vegetable wastes, pesticides and herbicides are organic impurities present in sewage other than animal wastes, oil and urea.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Wastewater_Story_Class_7_Science_Extra_Questions_Short_Answer_Type_Questions\"><\/span>Wastewater Story Class 7 Science Extra Questions Short Answer Type Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nOpen drain is a big concern now-a-days. Justify.<br \/>\nAnswer:<br \/>\nOpen drain is a big concern for the society now-a-days because they create unhygienic conditions. It provides favourable conditions to flies, mosquitoes and other insects to breed and spread a number of diseases.<\/p>\n<p>Question 2.<br \/>\nExplain, how sewage is disposed of in an aeroplane.<br \/>\nAnswer:<br \/>\nAeroplanes have their closed waste sewage tanks in them, which suck the wastewater and collect it in their tanks.<br \/>\nOnce the aeroplane lands on the ground, the crew disposed of the sewage properly into airport sewage facility.<\/p>\n<p>Question 3.<br \/>\nSewage also contains some nutrients Comment.<br \/>\nAnswer:<br \/>\nSewage is a complex mixture which contains suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes.<br \/>\nThe nutrients present in sewage are phosphorus and nitrogen.<\/p>\n<p>Question 4.<br \/>\nSuggest two alternative arrangements for sewage disposal where there is no sewerage system.<br \/>\nAnswer:<br \/>\nThe two alternative arrangements for sewage disposal, where there is no sewerage system are as below<\/p>\n<ul>\n<li>Septic tanks<\/li>\n<li>Composting pits.<\/li>\n<\/ul>\n<p>Question 5.<br \/>\nRecall and enlist some better house keeping practices.<br \/>\nAnswer:<br \/>\nWe must minimise and manage waste at our houses before its disposal in the following manner:<\/p>\n<ul>\n<li>Cooking oil and fats should not be thrown down the drain. They can harden and block the pipes. In an open drain the fats clog the soil pores reducing its effectiveness in filtering water. Throw oil and fats in the dustbin.<\/li>\n<li>Used tealeaves, solid food remains, soft toys, cotton, sanitary towels, etc., should also be thrown in the dustbin. These wastes choke the drains. They do not allow free flow of oxygen. This hampers the degradation process.<\/li>\n<li>The chemicals like paints, solvents, insecticides, medicines and motor oils should 1 State the role of screen bars in wastewater treatments, not be thrown in drains as they kill helpful 2 Chlorination makes water fit for human consumption. How? microbes which digest the organic waste.<\/li>\n<\/ul>\n<p>Question 6.<br \/>\nWater in a river is cleaned naturally. Do you agree? Think and explain. [HOTS]\nAnswer:<br \/>\nYes, river water is cleaned naturally by a process that is similar to wastewater treatment plant.<br \/>\nAs muddy water when flows through grass or weeds on its way to a stream, mud and solid particles get filtered out. At the bottom of a lake or stream, microorganism brings chemical changes in the water. The natural filtration process removes pollution from the roundwater throughout the process making it clean and fit for drinking.<\/p>\n<p>Question 7.<br \/>\nThe terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how? [NCERT Exemplar]\nAnswer:<br \/>\nThe terms like sewage, sewers and sewerage are interlinked with each other because sewage is a mixture of wastewater coming out of homes and other places. Sewers are pipes which carry sewage and sewerage is a network of sewage carrying pipes.<\/p>\n<p>Question 8.<br \/>\nDescribe onsite disposal systems.<br \/>\nAnswer:<br \/>\nSome organisations offer hygienic onsite human waste disposal technology. These toilets do not require scavenging. Excreta from the toilet seats flow through covered drains into a biogas plant. The biogas produced is used as a source of energy.<\/p>\n<p>Question 9.<br \/>\nA sewage treatment plant involves few steps in its working.<br \/>\nAeration tank, grit and sand removal tank, second sedimentation tank, bar screen, first sedimentation tank.<br \/>\n(a) Arrange all the above steps in the correct order in which they occur in the sewage treatment plant.<br \/>\n(b) Which step gives most of the sludge? [HOTS]\nAnswer:<br \/>\n(a) Bar screen, grit and sand removal tank, first sedimentation tank, aeration tank, second sedimentation tank.<br \/>\n(b) First sedimentation tank.<\/p>\n<p>Question 10.<br \/>\nGive reasons for each of the following.<br \/>\n(a) We should not throw used tea leaves into sink.<br \/>\n(b) We should not throw cooking oil and fats down the drain. [NCERT Exemplar]\nAnswer:<br \/>\n(a) We should not throw used tea leaves into sink because it may choke the drain-pipe of the sink.<br \/>\n(b) We should not throw cooking oil and fats down the drain as it can harden and block the drain-pipes.<\/p>\n<p>Question 11.<br \/>\nGiven below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.<br \/>\n(a) Sludge is scraped out and skimmer removes floating grease.<br \/>\n(b) Water is made to settle in a large tank with a slope in the middle.<br \/>\n(c) Large objects like plastic bags are removed by passing wastewater through bar screens.<br \/>\n(d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.<br \/>\n(e) Wastewater enters a grit and sand removal tank. {NCERT Exemplar]\nAnswer:<br \/>\nThe correct sequence of wastewater treatment in treatment plant is<br \/>\n(c) Large objects like plastic bags are removed by passing wastewater through bar screens.<br \/>\n(e) Wastewater enters a grit and sand removal tank.<br \/>\n(d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.<br \/>\n(b) Water is made to settle in a large tank with a slope in the middle.<br \/>\n(a) Sludge is scraped out and skimmer removes the floating grease.<\/p>\n<p>Question 12.<br \/>\nCan we contribute in sanitation at public places? Explain.<br \/>\nAnswer:<br \/>\nYes, we all have a role to play in keeping our environment clean and healthy. All of us can contribute in maintaining sanitation at public places. We should not scatter litter anywhere. If there is no dustbin in sight, we should carry the litter home and throw it in the dustbin.<\/p>\n<p>Question 13.<br \/>\nThree statements are provided here which define the terms, i.e. sludge, sewage and wastewater.<br \/>\nPick out the correct definition for each of these terms.<br \/>\n(a) The settled solids that are removed in wastewater treatment with a scraper.<br \/>\n(b) Water from kitchen used for washing dishes.<br \/>\n(c) Wastewater released from homes, industries, hospitals and other public buildings. [NCERT Exemplar]\nAnswer:<br \/>\n(a) The settled solids that are removed in wastewater treatment with a scraper is sludge.<br \/>\n(b) Water from kitchen which is used for washing dishes is wastewater.<br \/>\n(c) Wastewater released from homes, industries, hospitals and other public buildings is sewage.<\/p>\n<p>Question 14.<br \/>\nA man travelling in a train threw an empty packet of food on the platform. Do you think this is a proper waste disposal method? Elaborate. [NCERT Extmplar; HOTS]\nAnswer:<br \/>\nNo, one must always put the waste in a nearby dustbin or carry it home and dispose it in dustbins there.<br \/>\nWaste, not properly disposed may enter into the drains and choke them. It also makes public places dirty and unhygienic.<\/p>\n<p>Question 15.<br \/>\nWith reference to the treatment of polluted water at home by aeration, filtration, chlorination processes answer the following questions.<br \/>\n(a) What changes did we observe in the appearance of liquid after aeration? Did aeration change the odour?<br \/>\n(b) What is removed by the sand filter?<br \/>\n(c) Does chlorine change the colour of treated water?<br \/>\n(d) Do chlorine have an odour?<br \/>\nAnswer:<br \/>\n(a) Aerated water contains some suspended impurities and the foul odour of the polluted water disappears completely after aeration.<br \/>\n(b) Sand filter removes tiny suspended impurities.<br \/>\n(c) Chlorine makes the water clear and colourless.<br \/>\n(d) Yes, chlorine have a peculiar odour which is not worse than wastewater.<\/p>\n<p>Question 16.<br \/>\nObserve the given figure and answer the following:<br \/>\n(a) What does this figure show?<br \/>\n(b) State the functions of each part of the figure? [HOTS]\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75786\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Wastewater-Story-Class-7-Extra-Questions-Science-Chapter-18-1.png\" alt=\"Wastewater Story Class 7 Extra Questions Science Chapter 18 1\" width=\"664\" height=\"171\" \/><br \/>\nAnswer:<br \/>\n(a) This figure shows the supply of drinking water, its processing and its source as well. Functions of each part of the figure.<br \/>\n(b)<\/p>\n<ul>\n<li>River It is the source of water.<\/li>\n<li>Pumping station Pump the water to collect it in reservoir.<\/li>\n<li>Sedimentation tank Impurities are settle in the bottom of tank.<\/li>\n<li>Sand and gravel and sand filter Remove the dirt from the water.<\/li>\n<li>Chlorinating tank Chlorine is mixed in water to disinfect the eater and to kill the germs.<\/li>\n<li>To overhead tank Purified water is stored in this tank for supply to the households for drinking.<\/li>\n<\/ul>\n<p>Question 17.<br \/>\nComplete .the table given below of the contaminant survey.<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"127\">T<strong>ypes of sewage<\/strong><\/td>\n<td style=\"text-align: center\" width=\"169\"><strong>Point of origin<\/strong><\/td>\n<td style=\"text-align: center\" width=\"296\"><strong>Substances which contaminate<\/strong><\/td>\n<td style=\"text-align: center\" width=\"148\"><strong>Any other remark<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Sullage water<\/td>\n<td width=\"169\">Kitchen<\/td>\n<td width=\"148\"><\/td>\n<td width=\"148\"><\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Foul waste<\/td>\n<td width=\"169\">Toilets<\/td>\n<td width=\"148\"><\/td>\n<td width=\"148\"><\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Trade waste<\/td>\n<td width=\"169\">Industrial and commercial organisations<\/td>\n<td width=\"148\"><\/td>\n<td width=\"148\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Answer:<br \/>\nGiven below is the table of contaminant survey explaining types of sewage with their point of origin an contaminate in them.<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"127\"><strong>Type of sewage<\/strong><\/td>\n<td style=\"text-align: center\" width=\"169\"><strong>Point of origin<\/strong><\/td>\n<td style=\"text-align: center\" width=\"148\"><strong>Substances which contaminate<\/strong><\/td>\n<td style=\"text-align: center\" width=\"148\"><strong>Any other remark<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Sullage water<\/td>\n<td width=\"169\">Kitchen<\/td>\n<td width=\"148\">Cooking oils, fats, etc.<\/td>\n<td width=\"148\">May choke drains<\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Foul waste<\/td>\n<td width=\"169\">Toilets<\/td>\n<td width=\"148\">Faeces and urine<\/td>\n<td width=\"148\">Cause diseases like dysentery, cholera, etc<\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Trade waste<\/td>\n<td width=\"169\">Industrial and commercial organisations<\/td>\n<td width=\"148\">Chemicals like paints, solvents, motor oil, etc.<\/td>\n<td width=\"148\">Causes water and soil pollution<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Wastewater_Story_Class_7_Science_Extra_Questions_Long_Answer_Type_Questions\"><\/span>Wastewater Story Class 7 Science Extra Questions Long Answer Type Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nExplain the different types of inorganic and organic impurities generally present in sewage.<br \/>\nAnswer:<br \/>\nIt is wastewater released by homes, industries agricultural fields and other human activities. It also includes rainwater that has run down the street during a storm or heavy rain and it is a liquid waste. Most of its water has dissolved and suspended impurities called contaminants.<br \/>\n<strong>Composition of Sewage<\/strong><br \/>\nThe following components make the sewage:<\/p>\n<ul>\n<li>The organic impurities present in sewage are human faeces, animal wastes (like animal dung), urea (as urine), oil, fruits and vegetable wastes, pesticides, herbicides, etc.<\/li>\n<li>The inorganic impurities present in sewage are nitrates, phosphates and metals.<\/li>\n<li>The nutrients present in sewage are nitrogen and phosphorus.<\/li>\n<li>The bacteria present in sewage include those bacteria which cause water-borne diseases such as cholera and typhoid.<\/li>\n<li>The other microbes present in sewage are Protozoa which cause a water-borne disease called dysentery.<\/li>\n<\/ul>\n<p>Question 2.<br \/>\nDescribe septic tank. How does it function?<br \/>\nAnswer:<br \/>\nLow cost outside sewage disposal system have been developed to take care of places where there is no sewage system, e.g. rural areas, isolated buildings. These are described below:<br \/>\n(i) Septic tanks Septic tank is a low cost onsite sewage disposal system. Septic tanks are suitable where there is no sewerage made. These tanks need cleaning every four to six months.<\/p>\n<p>A septic tank usually consists of a big, covered underground tank made of concrete having an inlet pipe at one end and on outlet pipe at the other end. The toilet seat is connected to the inlet pipe of the septic tank. The human excreta from the toilet seat enters into the septic tank through the inlet pipe. The solid part of excreta keeps on collecting at the bottom of the septic tank in the form of a sludge whereas watery waste remains above it.<\/p>\n<p>The anaerobic bacteria breakdown most of the solid organic matter present in human excreta due to which the volume of solid waste is reduced too much. The digested solid waste keeps on depositing at the bottom of septic tank. The watery waste is also cleaned by anaerobic bacteria. The excess water goes out of the septic tank through the outlet pipe and get absorbed in soil.<\/p>\n<p>(ii) Composting pits These are self sustained human waste disposal units which is not connected to a sewer line or a septic tank. A composting toilet breaks down and dehydrate human waste to compost.<\/p>\n<p>(iii) Chemical toilets These toilets have limited storage capacity for human waste and need to be emptied periodically. These are the toilets which use chemically treated reservoir located just below the toilet seats. The chemicals reduce the foul smell coming out of human excrete and carry out partial disinfection of human waste.<\/p>\n<p>Question 3.<br \/>\nDiscuss vermi-processing toilets. Name the useful product obtained from such toilets.<br \/>\nAnswer:<br \/>\nIn the vermi-processing toilet, the human excreta is treated by earthworms in a pit. The earthworms gradually eat up all the organic matter present in human excreta, decompose it and pass out from their body in the form of warm casting (also called vermi cakes).<br \/>\nThe useful product obtained from a vermi-processing toilet is vermi cakes which is kind of high quality manure.<\/p>\n<p>Question 4.<br \/>\nOne day Sachin had gone to his uncle who lives in a village. He saw there a large number of people defecate in an open area because proper toilet facilities are not there. He wondered about the groundwater contamination, as he studied in his class that this act may cause water-borne diseases. He convinced village people to make toilets to avoid such an out break of water-borne diseases.<br \/>\n(a) Name two water-borne diseases.<br \/>\n(b) Explain vermi-composting toilets.<br \/>\n(c) What values are shown by Sachin? [Value Based Question]\nAnswer:<br \/>\n(a) Typhoid and cholera.<br \/>\n(b) In vermi-composting toilets, human excreta is treated by earthworms in a pit.<br \/>\n(c) He is intelligent and concious about health.<\/p>\n<p>Question 5.<br \/>\nThere are many alternative sewage disposal systems which have been developed as per needs of the community, persons, occasions, etc.. Few situations\/specifications of the sewage need are given below. Write the name of sewage which can be used in the following conditions.<br \/>\n(a) A toilet which can provide high quality manure.<br \/>\n(b) The toilet which is used in aeroplane during flight.<br \/>\n(c) A toilet which can be used in some out door gathering.<br \/>\n(d) A toilet used in limited water supply.<br \/>\n(e) A toilet which contaminates water of hand pump installed nearby. [HOTS]\nAnswer:<br \/>\n(a) Vermi-composting toilets<br \/>\n(b) Vacuum toilets<br \/>\n(c) Chemical toilets<br \/>\n(d) Composting toilets<br \/>\n(e) Septic tank toilets<\/p>\n<p>Question 6.<br \/>\nThink and suggest some ways to minimise waste and pollutants at their source, taking your home as an example.<br \/>\nAnswer:<br \/>\nWe can minimise waste and pollutants entering the water and create less wastewater by taking following few steps at home:<\/p>\n<ul>\n<li>By not throwing used tea leaves, solid food remains, etc., in the drain. We should throw it in the dustbin.<\/li>\n<li>By not throwing chemicals like medicines, paints, insecticides, etc., in the drain as they increase the pollution load of the sewage.<\/li>\n<\/ul>\n<p>Question 7.<br \/>\nTrisha has seen huge garbage dumps outside the school campus which are not being regularly disposed of by municipality of the area. She discussed the problem with her biology teacher and decided to organise a rally to spread awareness among local people.<br \/>\nNext day she delivered this information in the assembly and convinced the school mates to join her. She also explained them about the importance of sanitation at public places which she had recently studied in biology.<br \/>\n(a) In your views, who is responsible to maintain sanitation at public places?<br \/>\n(b) What would happen, if all the wastes produced at public places are not disposed of regularly?<br \/>\n(c) What are the valuesS shown by Trisha? [Value Based Question]\nAnswer:<br \/>\n(a) In my opinion, municipality is responsible to maintain sanitation at public places.<br \/>\n(b) If all the wastes produced at public places are not disposed of regularly and properly epidemics could break out.<br \/>\n(c) Responsibility, sensitivity and awareness towards public hygiene.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Wastewater_Story_Class_7_Science_Extra_Questions_Miscellaneous_Questions\"><\/span>Wastewater Story Class 7 Science Extra Questions Miscellaneous Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Multiple Choice Questions<\/strong><br \/>\nQuestion 1.<br \/>\nOpen drain system is a breeding place for which of the following? [NCERT Exemplar]\n(a) Flies<br \/>\n(b) Mosquitoes<br \/>\n(c) Organisms which cause diseases<br \/>\n(d) All of the above<br \/>\nAnswer:<br \/>\n(d) All of the above<\/p>\n<p>Question 2.<br \/>\nWhich of the following is not an inorganic impurity present in sewage?<br \/>\n(a) Nitrate<br \/>\n(b) Phosphorus<br \/>\n(c) Urea<br \/>\n(d) Metal salt<br \/>\nAnswer:<br \/>\n(c) Urea<\/p>\n<p>Question 3.<br \/>\nSewage is mainly a [NCERT Exemplar]\n(a) liquid waste<br \/>\n(b) solid waste<br \/>\n(c) gaseous waste<br \/>\n(d) mixture of solid and gas<br \/>\nAnswer:<br \/>\n(a) liquid waste<\/p>\n<p>Question 4.<br \/>\nThe aerobic bacteria can be grown in clarified water by<br \/>\n(a) filtration<br \/>\n(b) sewage<br \/>\n(c) aeration<br \/>\n(d) sedimentation<br \/>\nAnswer:<br \/>\n(c) aeration<\/p>\n<p>Question 5.<br \/>\nWhich of the following is\/are products of wastewater treatment? [NCERT Exemplar]\n(a) Biogas<br \/>\n(b) Sludge<br \/>\n(c) Both biogas and sludge<br \/>\n(d) Aerator<br \/>\nAnswer:<br \/>\n(c) Both biogas and sludge<\/p>\n<p>Question 6.<br \/>\nChlorine is used in municipal water treatment plant to<br \/>\n(a) change the teste of water<br \/>\n(b) prevent evaporation<br \/>\n(c) kill the harmful microorganisms<br \/>\n(d) prevent sedimentation<br \/>\nAnswer:<br \/>\n(c) kill the harmful microorganisms<\/p>\n<p>Question 7.<br \/>\nWhich of the following organisms produce biogas from sludge in the digester tank of a wastewater treatment plant?<br \/>\n(a) Anaerobic bacteria<br \/>\n(b) Fungi<br \/>\n(c) Aerobic bacteria<br \/>\n(d) Protozoa<br \/>\nAnswer:<br \/>\n(a) Anaerobic bacteria<\/p>\n<p>Question 8.<br \/>\nThe system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as [NCERT Exemplar]\n(a) sewers<br \/>\n(b) sewerage<br \/>\n(c) transport system<br \/>\n(d) treatment plant<br \/>\nAnswer:<br \/>\n(b) sewerage<\/p>\n<p>Question 9.<br \/>\nOne of the following type of trees are said to help in purifying wastewater quite rapidly when planted all along the sewage ponds. These are<br \/>\n(a) Eucalyptus trees<br \/>\n(b) Ficus trees<br \/>\n(c) neem trees<br \/>\n(d) peepal trees<br \/>\nAnswer:<br \/>\n(a) Eucalyptus trees<\/p>\n<p>Question 10.<br \/>\nWhich of the following is a part of inorganic impurities of the sewage? [NCERT Exemplar]\n(a) Pesticides<br \/>\n(b) Urea<br \/>\n(c) Phosphates<br \/>\n(d) Vegetable waste<br \/>\nAnswer:<br \/>\n(c) Phosphates<\/p>\n<p>Question 11.<br \/>\nWhich of the following statements about ozone are correct?<br \/>\nI It is essential for breathing of living organisms.<br \/>\nII It is used to disinfect water.<br \/>\nIII It absorbs ultraviolet rays.<br \/>\nIV Its proportion in air is about 3%.<br \/>\n(a) I and II<br \/>\n(b) II and III<br \/>\n(c) I and III<br \/>\n(d) II and IV<br \/>\nAnswer:<br \/>\n(b) II and III<\/p>\n<p>Question 12.<br \/>\nIn a filtration plant, water is filtered using layers of<br \/>\n(a) sand and clay<br \/>\n(b) clay and fine gravel<br \/>\n(c) sand and fine gravel<br \/>\n(d) sand, fine gravel and medium gravel<br \/>\nAnswer:<br \/>\n(d) sand, fine gravel and medium gravel<\/p>\n<p>Question 13.<br \/>\nWhich one of the following is a quality of wastewater?<br \/>\n(a) Fowl smell<br \/>\n(b) Bad taste<br \/>\n(c) Dirty look<br \/>\n(d) All of these<br \/>\nAnswer:<br \/>\n(d) All of these<\/p>\n<p>Question 14.<br \/>\nPeriod 2005-2015 is being celebrated as the international decade for action on<br \/>\n(a) water for life<br \/>\n(b) education for all<br \/>\n(c) global warming<br \/>\n(d) terrorism<br \/>\nAnswer:<br \/>\n(a) water for life<\/p>\n<p>Question 15.<br \/>\nIn sewerage main holes are located at every<br \/>\n(a) 20-25 m<br \/>\n(b) 50-60 m<br \/>\n(c) 90-100 m<br \/>\n(d) 100-110 m<br \/>\nAnswer:<br \/>\n(b) 50-60 m<\/p>\n<p>Question 16.<br \/>\nWhich of these is a part of the wastewater treatment plant?<br \/>\n(a) Clarifier<br \/>\n(b) Vertical bars<br \/>\n(c) Aeration tank<br \/>\n(d) All of these<br \/>\nAnswer:<br \/>\n(d) All of these<\/p>\n<p>Question 17.<br \/>\nWhich of these methods should not be used for disposal of urine and faeces if no sewage system is available?<br \/>\n(a) Allowing untreated sewage to flow into rivers<br \/>\n(b) Making septic tanks for sewage to flow into<br \/>\n(c) Allowing sewage to flow into a biogas plant<br \/>\n(d) Using a vermi-composting toilet<br \/>\nAnswer:<br \/>\n(a) Allowing untreated sewage to flow into rivers<\/p>\n<p><strong>Fill in the Blanks<\/strong><br \/>\n1. Untreated human excreta is a \u2026\u2026\u2026\u2026\u2026\u2026. hazard.<br \/>\n2. Vermi-composting toilets use \u2026\u2026\u2026\u2026\u2026\u2026. to treat human waste.<br \/>\n3. Poor sanitation is crowded public places can result in spread of \u2026\u2026\u2026\u2026\u2026\u2026. .<br \/>\n4. Dried sludge is used as \u2026\u2026\u2026\u2026\u2026\u2026. .<br \/>\n5. Wastewater is treated in \u2026\u2026\u2026\u2026\u2026\u2026. treatment plant.<br \/>\n6. Wastewater released by houses is called \u2026\u2026\u2026\u2026\u2026\u2026. .<br \/>\n7. Stagnant water blocked in drains is good breeding place for \u2026\u2026\u2026\u2026\u2026\u2026. .<br \/>\n8. All portable toilets are \u2026\u2026\u2026\u2026\u2026\u2026. toilets.<br \/>\n9. The full form of WWTP is \u2026\u2026\u2026\u2026\u2026\u2026. .<br \/>\n10. Bacteria play important \u2026\u2026\u2026\u2026\u2026\u2026. in sewage treatment.<br \/>\nAnswers:<br \/>\n1. health<br \/>\n2. earthworms<br \/>\n3. diseases<br \/>\n4. sludge activator<br \/>\n5. waste<br \/>\n6. sewage<br \/>\n7. insect vectors<br \/>\n8. chemical<br \/>\n9. wastewater treatment plant<br \/>\n10. role<\/p>\n<p><strong>True\/False<\/strong><br \/>\n1. Sewage is a solid waste which causes water pollution and soil pollution. [NCERT Exemplar]\n2. Used water is wastewater.<br \/>\n3. Wastewater could be reused.<br \/>\n4. Where underground sewerage systems and refuse disposal systems are not available, the high cost onsite sanitation system can be adopted. [NCERT Exemplar]\n5. We should not defecate is open because untreated human waste is a health hazard.<br \/>\n6. Cooking oil, fats should not be thrown in the drainage system directly.<br \/>\n7. Microorganisms are present in the domestic waste also.<br \/>\n8. Poor sanitation and contaminated drinking water is the cause of a large number of diseases.<br \/>\n9. Wastewater is transparent, colourless, odourless.<br \/>\n10. Tuberculosis is a water-borne disease.<br \/>\n11. Aerobic bacteria produces biogas sludge in the digester tank.<br \/>\n12. urea is an inorganic impurity present in sewage.<br \/>\nAnswers:<br \/>\n1. False, sewage is a liquid waste which causes water pollution and soil pollution.<br \/>\n2. True<br \/>\n3. True<br \/>\n4. False, where underground sewerage systems and refuse disposal systems are not available, the low cost onsite sanitation system can be adopted.<br \/>\n5. True<br \/>\n6. True<br \/>\n7. True<br \/>\n8. True<br \/>\n9. False, potable water is transparent, colourless and odourless.<br \/>\n10. False, water-borne diseases are cholera, typhoid, dysentery, etc.<br \/>\n11. False, anaerobic bacteria produce biogas.<br \/>\n12. False, urea is an organic impurity present in sewage.<\/p>\n<p><strong>Match the Columns<\/strong><br \/>\nQuestion 1.<br \/>\nMatch the Column I with Column II.<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"128\"><strong>Column I<\/strong><\/td>\n<td style=\"text-align: center\" width=\"158\"><strong>Column II<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"128\">(a) Inorganic impurities<\/td>\n<td width=\"158\">(i) Phosphorus and nitrogen<\/td>\n<\/tr>\n<tr>\n<td width=\"128\">(b) Organic impurities<\/td>\n<td width=\"158\">(ii) Nitrates and phosphates<\/td>\n<\/tr>\n<tr>\n<td width=\"128\">(c) Nutrients<\/td>\n<td width=\"158\">(iii) Cholera and typhoid<\/td>\n<\/tr>\n<tr>\n<td width=\"128\">(d) Bacteria<\/td>\n<td width=\"158\">(iv) Pesticides and herbicides<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Answers:<br \/>\n1.<br \/>\n(a)-(ii)<br \/>\n(b)-(iv)<br \/>\n(c)-(i)<br \/>\n(d)-(iii)<\/p>\n<h4><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Wastewater Story Class 7 Extra Questions Science Chapter 18 Wastewater Story Class 7 Science Extra Questions Very Short Answer Type [&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":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"\"Get Wastewater Story Class 7 Extra Questions Science Chapter 18 on Infinity Learn.\"","custom_permalink":"study-material-extra-question\/class-7\/wastewater-story-class-7\/science\/extra-questions-science-chapter-18"},"categories":[93,116,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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