{"id":2957,"date":"2021-12-28T12:08:48","date_gmt":"2021-12-28T06:38:48","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=2957"},"modified":"2025-05-16T14:24:55","modified_gmt":"2025-05-16T08:54:55","slug":"study-materials-ncert-solutions-class-7-science-chapter-17-forestour-life-line","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-17-forestour-life-line\/","title":{"rendered":"Ncert Solutions for Class 7 Science Chapter 17 Forest: Our Life Line"},"content":{"rendered":"<p><span data-contrast=\"none\">The NCERT Solutions Class 7 Science Chapter 17 \u2013 Forest: Our LifeLine is crucial for the students of the 7th standard. The solutions are provided here to assist the students in understanding the Forest: Our LifeLine easily and interestingly.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:150,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">All the\u202fNCERT Solutions\u202fare prepared and compiled by subject experts as per the latest CBSE syllabus (2020-2021). The students need to practice the solutions regularly for effective preparation for the examination.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:150,&quot;335559740&quot;:240}\"> <\/span><\/p>\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\/2957\" 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\/FOREST-OUR-LIFELINE.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%2FFOREST-OUR-LIFELINE.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=\"9d18e2d36a\" data-disablerightclick=\"on\" data-toolbar=\"top\" data-toolbar-fixed=\"on\">FOREST OUR LIFELINE<br\/><\/a>\n<p><strong>CHAPTER 17_FOREST: OUR LIFELINE NCERT SOLUTIONS<\/strong><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">1. Explain how animals dwelling in the forest help it grow and regenerate.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> i)<\/span> <span data-contrast=\"none\">Micro-organisms that convert the dead plants and animals to humus are known as decomposers.  This humus helps in returning the nutrients to the soil. Plants absorb these.<\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">The animals also help in dispersing the seeds of certain plants.<\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">The decaying animal material and cattle dung provides nutrients for various types of seedlings to grow.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:1134,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:1134,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">All these activities of animals dwelling in the forest help it grow and <\/span><span data-contrast=\"none\">regenerate.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">2. Explain how forests prevent floods.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A. i<\/strong>)<\/span> <span data-contrast=\"none\">The uppermost layer of the forest canopy intercepts the flow of raindrops, and most of the water comes down through the branches and the stems of the trees.<\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">From the leaves, it drips slowly over branches of the shrubs and herbs.<\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">Thus, forests act as natural absorbers of rainwater and allow it to seep.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">iv)<\/span> <span data-contrast=\"none\">In this way, forests help in controlling the floods and maintain a steady supply of<\/span> <span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">3. What are decomposers? Name any two of them. What do they do in the forest?<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> i)<\/span> <span data-contrast=\"none\">Decomposers are micro-organisms. They decompose the dead plants and animal tissues and convert them into humus (dark-colored substances).<\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">Bacteria and fungi are the two types of decomposers.<\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">They help recycle nutrients by decomposing various dead organisms such <\/span><span data-contrast=\"none\">as plants and animals to form humus.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:1134,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:1134,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">4. Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> i)<\/span> <span data-contrast=\"none\">Forests are called the green lungs. This is because plants in the forest release oxygen through photosynthesis and help provide oxygen to animals for respiration. <\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">Plants consume carbon dioxide released by the animals. <\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">In this way, plants help maintain a balance of oxygen and carbon dioxide <\/span><span data-contrast=\"none\">in the atmosphere.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">5. Explain why there is no waste in a forest.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> i)<\/span> <span data-contrast=\"none\">The microbes present in the forest act on the wastes and convert them into useful materials like hummus. <\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">The hummus gets mixed with the soil and ensures the enrichment of soil fertility. <\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">Hence, there is no waste in a forest.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">6. List five products we get from forests.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> i) Medicines<\/span> <span data-contrast=\"none\">ii) Wood<\/span> <span data-contrast=\"none\">iii) Paper<\/span> <span data-contrast=\"none\">iv) Oil<\/span><\/p>\n<p><span data-contrast=\"none\">v) Gum.<\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">7. Fill in the blank :<\/span><\/b><\/p>\n<p><span data-contrast=\"none\">a)<\/span> <span data-contrast=\"none\">The insects, butterflies, honeybees, and birds help flowering plants in<\/span><\/p>\n<p><span data-contrast=\"none\">b)<\/span> <span data-contrast=\"none\">A forest is a purifier of _______________ and _______________.<\/span><\/p>\n<p><span data-contrast=\"none\">c)<\/span> <span data-contrast=\"none\">Herbs form the _______________ layer in the forest.<\/span><\/p>\n<p><span data-contrast=\"none\">d)<\/span> <span data-contrast=\"none\">The decaying leaves and animal droppings in a forest enrich the<\/span><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> a) pollination<\/span> <span data-contrast=\"none\">b) air and water<\/span> <span data-contrast=\"none\">c) lowest<\/span> <span data-contrast=\"none\">d) soil fertility<\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">8. Why should we worry about the conditions and issues related to forests far from us? (Or) Why should we conserve forests?<\/span><\/b><\/p>\n<p><span data-contrast=\"none\">A. There are various reasons we should be vigilant about matters related to forests.<\/span><\/p>\n<p><span data-contrast=\"none\">i)<\/span> <span data-contrast=\"none\">A decrease in forest area would lead to an increase in carbon dioxide in the air. This will lead to an increase earth\u2019s temperature.<\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">Soil erosion would occur if there were no forests.<\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">Floods would be more frequent in the absence of forests.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">iv)<\/span> <span data-contrast=\"none\">When forests are adversely affected, the habitats of wild animals are also adversely affected. Therefore, we need to conserve our forests.<\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">9. Explain why there is a need for various animals and plants in a forest.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> i)<\/span> <span data-contrast=\"none\">The plants and animals in a forest are interdependent.<\/span><\/p>\n<p><span data-contrast=\"none\">ii)<\/span> <span data-contrast=\"none\">The diversity of plants and animal facilitates them to meet their needs.<\/span><\/p>\n<p><span data-contrast=\"none\">iii)<\/span> <span data-contrast=\"none\">Having a variety of plants and animals also helps maintain the ecological <\/span><span data-contrast=\"none\">balance. <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">10. In the figure, the artist forgot to put the arrows&#8217; labels and directions. Mark the directions on the arrows and label the diagram using the following labels:<\/span><\/b><\/p>\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:567,&quot;335559738&quot;:113,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <img loading=\"lazy\" class=\"alignnone size-full wp-image-58547\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/f1-1.png\" alt=\"\" width=\"242\" height=\"191\" \/><\/span><\/p>\n<p><b><span data-contrast=\"none\">clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:113,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\">.<\/span><\/p>\n<p>A.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-medium wp-image-58548\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/f2-1-300x191.png\" alt=\"\" width=\"300\" height=\"191\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/f2-1-300x191.png?v=1643172911 300w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/f2-1.png?v=1643172911 330w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:567,&quot;335559738&quot;:113,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,4961,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0],&quot;469777928&quot;:[1,3,1,1,1]}\"> <\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">11. Which of the following is not a forest product?<\/span><\/b><\/p>\n<p><b><span data-contrast=\"none\">i) Gum<\/span><\/b> <b><span data-contrast=\"none\">ii) Plywood<\/span><\/b> <b><span data-contrast=\"none\">iii) Sealing wax<\/span><\/b> <b><span data-contrast=\"none\">iv) Kerosene<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> Kerosene<\/span><\/p>\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><b><\/b><b><span data-contrast=\"none\">12. Which of the following statements is not correct?<\/span><\/b><\/p>\n<p><b><span data-contrast=\"none\">i)<\/span><\/b> <b><span data-contrast=\"none\">Forests protect the soil from erosion.<\/span><\/b><\/p>\n<p><b><span data-contrast=\"none\">ii)<\/span><\/b> <b><span data-contrast=\"none\">Plants and animals in a forest are not dependent on one another.<\/span><\/b><\/p>\n<p><b><span data-contrast=\"none\">iii)<\/span><\/b> <b><span data-contrast=\"none\">Forests influence the climate and water cycle.<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:567,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:288,&quot;335559991&quot;:567,&quot;469777462&quot;:[567,1134,1701,2891,5216,7540,9071,9638],&quot;469777927&quot;:[0,0,0,0,0,0,0,0],&quot;469777928&quot;:[1,1,1,1,1,1,1,1]}\"> <\/span><\/p>\n<p><b><span data-contrast=\"none\">iv)<\/span><\/b> <b><span data-contrast=\"none\">Soil helps forests to grow and regenerate.<\/span><\/b><\/p>\n<p><span data-contrast=\"none\"><strong>A.<\/strong> plants and animals in a forest are not dependent on one another.<\/span><\/p>\n<p><b><\/b><b><span data-contrast=\"none\">13. Micro-organisms act upon the dead plants to produce<\/span><\/b><\/p>\n<p><b><span data-contrast=\"none\">i) sand<\/span><\/b> <b><span data-contrast=\"none\">ii) mushrooms<\/span><\/b> <b><span data-contrast=\"none\">iii) humus<\/span><\/b> <b><span data-contrast=\"none\">iv) wood <\/span><\/b><\/p>\n<p><span data-contrast=\"auto\"><strong>A.<\/strong> Humus.<\/span><\/p>\n<p><strong>Introduction to NCERT Solutions Class 7 Science Chapter 18 Wastewater Story<\/strong><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:300,&quot;335559739&quot;:150,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">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 result in water pollution. This can cause many diseases and health hazards for us in the long run.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:150,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">For instance, in Minamata City, Japan, mercury 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 congenital disabilities.\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 that consumed contaminated fish. This adversely affected bodily functions and caused many problems for the people and their descendants. Hence, we need to prevent such issues by preventing industrial effluents, which pollute our most precious resource \u2013 water.<\/span><\/p>\n<p><strong>Wastewater Story Chapter has eight subtopics which are listed below. <\/strong><\/p>\n<ol>\n<li><span data-contrast=\"none\">Water our lifeline<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">What is sewage<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">Water freshens up-an eventful journey<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">Wastewater treatment plant<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">Better housekeeping practices<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">Sanitation and diseases<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">An alternative arrangement for sewage disposal<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<li><span data-contrast=\"none\">Sanitation in public places<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:200,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<\/ol>\n<p><span data-contrast=\"none\">Water is a resource that we use for almost all of our activities. Consequently, polluting this resource can adversely affect our health. Human activities mainly pollute it as a result of commercial or industrial exploits. The waste by-products contain many poisonous chemicals that disrupt the marine ecosystem. Also, human excreta poses a major threat and could potentially be a bio-hazard due to the many harmful microbes it carries. These microbes or chemicals could leech into the aquatic environment affecting every life form that comes into contact.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:150,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"none\">NCERT Solutions Class 7 Wastewater Story guides the students to segregate waste to reduce water pollution. This chapter demonstrates the importance of water in balancing the ecosystem. Students will get to study the meaning of sewage, its treatment, and disposal methods. This chapter creates an awareness of sanitation in students, which helps them to become responsible citizens.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:150,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"none\"><span style=\"color: #ff0000;\">Check here<\/span> to refer to the other\u202f<\/span><span data-contrast=\"none\">NCERT Solution for Class 7 Science Chapters<\/span><span data-contrast=\"none\">.<\/span><\/p>\n<div class=\"table-responsive\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The NCERT Solutions Class 7 Science Chapter 17 \u2013 Forest: Our LifeLine is crucial for the students of the 7th [&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 17 Forest: Our Life Line","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Ncert Solutions for Class 7 Science Chapter 17 Forest: Our Life Line","custom_permalink":"study-materials\/ncert-solutions\/class-7\/science\/chapter-17-forestour-life-line\/"},"categories":[81],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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