{"id":5187,"date":"2021-12-29T15:32:38","date_gmt":"2021-12-29T10:02:38","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=5187"},"modified":"2025-07-31T17:21:15","modified_gmt":"2025-07-31T11:51:15","slug":"class-8-science-chapter-2-ncert-solutions-free-pdf-download","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/","title":{"rendered":"NCERT Solutions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe"},"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-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Class_8_Science_Chapter_2_Question_Answer_PDF\" title=\"Class 8 Science Chapter 2 Question Answer PDF\">Class 8 Science Chapter 2 Question Answer PDF<\/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-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Class_8_Science_chapter_2_Question_Answer\" title=\"Class 8 Science chapter 2 Question Answer\">Class 8 Science chapter 2 Question Answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#NCERT_Solutions_for_Class_8_Science_Chapter_2_-_Short_Questions_with_answers\" title=\"NCERT Solutions for Class 8 Science Chapter 2 &#8211; Short Questions with answers\">NCERT Solutions for Class 8 Science Chapter 2 &#8211; Short Questions with answers<\/a><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_1_What_are_microorganisms\" title=\"Question 1: What are microorganisms?\">Question 1: What are microorganisms?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_2_Name_some_common_diseases_caused_by_microorganisms\" title=\"Question 2: Name some common diseases caused by microorganisms.\">Question 2: Name some common diseases caused by microorganisms.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_3_How_do_microorganisms_help_in_making_curd_and_bread\" title=\"Question 3: How do microorganisms help in making curd and bread?\">Question 3: How do microorganisms help in making curd and bread?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_4_What_role_do_microorganisms_play_in_cleaning_the_environment\" title=\"Question 4: What role do microorganisms play in cleaning the environment?\">Question 4: What role do microorganisms play in cleaning the environment?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_5_How_can_microorganisms_be_harmful\" title=\"Question 5: How can microorganisms be harmful?\">Question 5: How can microorganisms be harmful?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_6_What_are_antibiotics_Give_an_example\" title=\"Question 6: What are antibiotics? Give an example.\">Question 6: What are antibiotics? Give an example.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_7_What_is_fermentation_Name_a_product_made_by_this_process\" title=\"Question 7: What is fermentation? Name a product made by this process.\">Question 7: What is fermentation? Name a product made by this process.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_8_How_can_we_preserve_food_from_spoilage_by_microorganisms\" title=\"Question 8: How can we preserve food from spoilage by microorganisms?\">Question 8: How can we preserve food from spoilage by microorganisms?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_9_Why_is_it_important_to_take_a_full_course_of_antibiotics\" title=\"Question 9: Why is it important to take a full course of antibiotics?\">Question 9: Why is it important to take a full course of antibiotics?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Question_10_How_do_vaccines_work\" title=\"Question 10: How do vaccines work?\">Question 10: How do vaccines work?<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#NCERT_Solutions_Class_8_Science_Chapter_2\" title=\"NCERT Solutions Class 8 Science Chapter 2\">NCERT Solutions Class 8 Science Chapter 2<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Class_8_Science_NCERT_Solutions_for_All_Chapters\" title=\"Class 8 Science NCERT Solutions for All Chapters\">Class 8 Science NCERT Solutions for All Chapters<\/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-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Class_8_Science_Chapter_2_NCERT_Solution_-_Free_PDF_Download\" title=\"Class 8 Science Chapter 2 NCERT Solution &#8211; Free PDF Download\">Class 8 Science Chapter 2 NCERT Solution &#8211; Free PDF Download<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Microorganisms_Chapter_2_Class_8_Friend_and_Foe\" title=\"Microorganisms (Chapter 2) Class 8: Friend and Foe\">Microorganisms (Chapter 2) Class 8: Friend and Foe<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#A_weighted_average_of_Ch_2_Science_Class_8_marks\" title=\"A weighted average of Ch 2 Science Class 8 marks\">A weighted average of Ch 2 Science Class 8 marks<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Benefits_of_NCERT_Solutions_Class_8_Science_Chapter_2\" title=\"Benefits of NCERT Solutions Class 8 Science Chapter 2\">Benefits of NCERT Solutions Class 8 Science Chapter 2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#NCERT_Solutions_for_Class_8_Science_Chapter_2_FAQs\" title=\"NCERT Solutions for Class 8 Science Chapter 2 FAQs\">NCERT Solutions for Class 8 Science Chapter 2 FAQs<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#What_is_the_main_focus_of_NCERT_Class_8_Science_Chapter_2\" title=\"What is the main focus of NCERT Class 8 Science Chapter 2?\">What is the main focus of NCERT Class 8 Science Chapter 2?<\/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-8\/science\/chapter-2-microorganisms-friend-and-foe\/#What_are_microorganisms\" title=\"What are microorganisms?\">What are microorganisms?<\/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-8\/science\/chapter-2-microorganisms-friend-and-foe\/#How_are_microorganisms_classified_in_this_chapter\" title=\"How are microorganisms classified in this chapter?\">How are microorganisms classified in this chapter?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#What_are_the_beneficial_roles_of_microorganisms\" title=\"What are the beneficial roles of microorganisms?\">What are the beneficial roles of microorganisms?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#How_can_microorganisms_be_harmful\" title=\"How can microorganisms be harmful?\">How can microorganisms be harmful?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Can_you_provide_examples_of_beneficial_microorganisms\" title=\"Can you provide examples of beneficial microorganisms?\">Can you provide examples of beneficial microorganisms?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#How_do_microorganisms_spoil_food\" title=\"How do microorganisms spoil food?\">How do microorganisms spoil food?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-2-microorganisms-friend-and-foe\/#Why_are_antibiotics_important\" title=\"Why are antibiotics important?\">Why are antibiotics important?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p><strong>Class 8 Science Chapter 2,&#8221;Microorganisms:<\/strong> Friend and Foe,&#8221; helps students explore the amazing world of tiny living organisms that we cannot see with the naked eye. These microorganisms are found everywhere\u2014air, water, soil, and even inside our bodies. Some of them are helpful, while others can cause harm. This chapter explains how microorganisms play a vital role in food production, medicine, and cleaning the environment, but can also spread diseases and spoil food.<\/p>\n<p>To help students understand this topic better, we have provided well-explained <strong><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/\">NCERT Solutions for Class 8<\/a><\/strong>. These answers are written in simple language to match the understanding level of Class 8 students. If you are searching for class 8 science chapter 2 question answer or science class 8 chapter 2 question answer, this guide is perfect for you. It covers all the important topics, definitions, and class 8 science ch 2 question answer in an easy-to-read format.<\/p>\n<p>Whether you are preparing for exams or just revising your lessons, these class 8 science chapter 2 microorganisms: friend and foe question answer sets will clear your doubts. We also offer a class 8 science chapter 2 question answer PDF for students who prefer to study offline. These solutions follow the latest <a href=\"https:\/\/infinitylearn.com\/surge\/cbse\/cbse-syllabus\/\"><strong>CBSE syllabus<\/strong><\/a> and <a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/\"><strong>NCERT Solutions<\/strong><\/a> guidelines, helping you score better and gain confidence in science.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Class_8_Science_Chapter_2_Question_Answer_PDF\"><\/span>Class 8 Science Chapter 2 Question Answer PDF<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Class 8 Science Chapter 2, <em>Microorganisms: Friend and Foe<\/em>,<\/strong> teaches us about tiny living things that can be both useful and harmful. To help students understand the chapter better, we have created easy and clear Class 8 Science Chapter 2 question answers in PDF format. These answers are perfect for quick revision and exam preparation.<\/p>\n<p>If you are looking for Class 8 Science Chapter 2 extra questions and answers or want to download the Class 8 Science Chapter 2 PDF question answer, this guide is just what you need. It is based on the latest <a href=\"https:\/\/infinitylearn.com\/surge\/cbse\/cbse-class-8-science-syllabus\/\"><strong>CBSE Class 8 Science Syllabus<\/strong><\/a> and includes important topics in simple language.<\/p>\n<p>You can use this Class 8 Science Chapter 2 PDF to study offline anytime and improve your understanding of the chapter easily.<\/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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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\/MICROORGANISMS-FRIEND-AND-FOE.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%2FMICROORGANISMS-FRIEND-AND-FOE.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=\"cd654c6456\" data-disablerightclick=\"on\" data-toolbar=\"top\" data-toolbar-fixed=\"on\">MICROORGANISMS FRIEND AND FOE<br\/><\/a>\n<h2><span class=\"ez-toc-section\" id=\"Class_8_Science_chapter_2_Question_Answer\"><\/span>Class 8 Science chapter 2 Question Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here are all the science Class 8 chapter 2 question answer from the <a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-books\/\"><strong>NCERT textbook<\/strong><\/a>.<\/p>\n<p><strong>1. Fill in the blanks :<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>Microorganisms can be seen with the help of a <strong>__________<\/strong>.<\/li>\n<li>Blue green algae fix <strong>__________<\/strong> directly from air to enhance fertility of soil.<\/li>\n<li>Alcohol is produced with the help of <strong>__________<\/strong>.<\/li>\n<li>Cholera is caused by <strong>__________<\/strong>.<\/li>\n<\/ol>\n<p><strong>Ans. i) microscope ii) nitrogen iii) yeast iv) bacteria<\/strong><\/p>\n<p><strong> Tick the correct answer :<\/strong><\/p>\n<p><strong>a. Yeast is used in the production of :<\/strong><\/p>\n<p>i) sugar ii) alcohol (P) iii) hydrochloric acid iv) oxygen<\/p>\n<p><strong>b. The following is an antibiotic :<\/strong><\/p>\n<p>i) Sodium bicarbonate ii) Streptomycin (P) iii) Alcohol iv) Yeast<\/p>\n<p><strong>c. Carrier of malaria-causing protozoan is :<\/strong><\/p>\n<p>i) female <em>Anopheles<\/em> mosquito (P) ii) cockroach iii) housefly iv)butterfly<\/p>\n<p><strong>d. The most common carrier of communicable diseases is :<\/strong><\/p>\n<p>i) ant ii) housefly (P) iii) dragonfly iv) spider<\/p>\n<p><strong>e. The bread or idli dough rises because of :<\/strong><\/p>\n<p>i) heat ii) grinding iii) growth of yeast cells (P) iv) kneading<\/p>\n<p><strong>f. The process of conversion of sugar into alcohol is called :<\/strong><\/p>\n<p>i) nitrogen fixation ii) moulding iii) fermentation (P) iv) infection<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/infinitylearn.com\/surge\/cbse\/cbse-class-8-science-syllabus\/\" target=\"_blank\" rel=\"noopener\">CBSE Class 8 Science Syllabus 2024-25<\/a><\/strong><\/p>\n<p><strong>3. Match the organisms in Column A with their action in Column B.<\/strong><\/p>\n<p><strong> Column A Column B<\/strong><\/p>\n<p>i) Bacteria ( ) a) Fixing nitrogen<\/p>\n<p>ii) <em>Rhizobium<\/em> ( ) b) Setting of curd<\/p>\n<p>iii) <em>Lactobacillus<\/em> ( ) c) Baking of bread<\/p>\n<p>iv) Yeast ( ) d) Causing malaria<\/p>\n<p>v) A protozoan ( ) e) Causing cholera<\/p>\n<p>vi) A virus ( ) f) Causing AIDS<\/p>\n<p>g) Producing antibodies<\/p>\n<p><strong>Ans. i) e ii) a iii) b iv) c v) d vi) f<\/strong><\/p>\n<p style=\"text-align: center;\"><button><a class=\"btn btn-primary\" href=\"https:\/\/infinitylearn.com\/online-courses-cbse-class-8?utm_source=surge&amp;utm_medium=interlinking\"><strong>Enroll Now to Online Classes for CBSE Class 8<\/strong><\/a><\/button><\/p>\n<p><strong>4. Can microorganisms be seen with the naked eye ? If not, how can they be seen ?<\/strong><\/p>\n<p><strong>Ans.<\/strong> i) Microorganisms cannot be seen with the naked eye.<\/p>\n<p>ii) They can be seen with the help of a magnifying glass or microscope.<\/p>\n<p><strong>5. What are the major groups of microorganisms ?<\/strong><\/p>\n<p><strong>Ans.<\/strong> Microorganisms are classified into four major groups. They are &#8211;<\/p>\n<p>i) Bacteria ii) Fungi iii) Protozoa v) Algae<\/p>\n<p><strong>6. Name the microorganisms which can fix atmospheric nitrogen in the soil.<\/strong><\/p>\n<p><em><strong>Ans.<\/strong> Rhizobium, Anabaena, Nostoc, Azotobacter,<\/em> etc.<\/p>\n<p><strong>7. Write 10 lines on the usefulness of microorganisms in our lives.<\/strong><\/p>\n<p><strong>Ans.<\/strong> i) Microorganisms play an important role in our lives.<\/p>\n<p>ii) Microorganisms are used for various purposes such as bread making, preparation of curd, alcoholic beverages, vinegar etc.<\/p>\n<p>iii) Some of the bacteria are used in the preparation of medicines.<\/p>\n<p>iv) They play an important role in the decomposition of organic wastes and keeping the environment clean.<\/p>\n<p>v) Some microorganisms increase the fertility of the soil by fixing nitrogen.<\/p>\n<p>vi) Microorganisms are used for the production of vaccines.<\/p>\n<p>vii) Certain microorganisms are used in the biological treatment of sewage.<\/p>\n<p>viii) They are also used for the production of antibiotics.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-8\/science\/\" target=\"_blank\" rel=\"noopener\">NCERT Exemplar Class 8 Science Solutions \u2013 Free PDF Download<\/a><\/strong><\/p>\n<p><strong>8. Write a short paragraph on the harms caused by microorganisms.<\/strong><\/p>\n<p><strong>Ans.<\/strong> i) Microorganisms cause diseases in animals. Eg : In\u2005cattle, the foot and mouth disease is caused by a virus.<\/p>\n<p>ii) Several microbes cause diseases in plants. Eg : The productivity of wheat, orange, apple etc. is reduced due to microbial diseases in plants.<\/p>\n<p>iii) Certain microbes, on entering into our body, produce toxic substances. This leads to diseases.<\/p>\n<p>iv) Some microorganisms such as fungus spoil our food. For example, bread when left unused under moist conditions gets spoilt by fungus.<\/p>\n<p>v) Some of the protozoans cause serious diseases like dysentery and malaria.<\/p>\n<p><strong>9. What are antibiotics? What precautions must be taken while taking antibiotics?<\/strong><\/p>\n<p><strong>Ans.<\/strong> The medicines produced by certain microorganisms used to kill other disease-causing micro-organisms are called antibiotics. (or) The chemical substances that kill or stop the growth of microorganisms are called antibodies.<\/p>\n<p>Eg : Streptomycin, tetracycline, penicillin etc.<\/p>\n<p><strong>Precautions to be taken while using antibiotics:<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>Antibiotics should be taken under the supervision of a well qualified doctor.<\/li>\n<li>Course (intake) of antibiotics should be completed as per the prescription given by the doctor.<\/li>\n<li>Antibiotics should be taken in the right amount and at the right time.<\/li>\n<\/ol>\n<div class=\"h1-banner-title\">\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_8_Science_Chapter_2_-_Short_Questions_with_answers\"><\/span>NCERT Solutions for Class 8 Science Chapter 2 &#8211; Short Questions with answers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here are all the short type class 8 science chapter 2 question answer:<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_1_What_are_microorganisms\"><\/span>Question 1: What are microorganisms?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Microorganisms are tiny living things that can only be seen with a microscope. They include bacteria, viruses, fungi, protozoa, and algae.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_2_Name_some_common_diseases_caused_by_microorganisms\"><\/span>Question 2: Name some common diseases caused by microorganisms.<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Some common diseases caused by microorganisms are:<\/p>\n<ul>\n<li>Bacteria: Tuberculosis, Cholera<\/li>\n<li>Viruses: Common cold, Influenza, AIDS<\/li>\n<li>Fungi: Athlete&#8217;s foot, Ringworm<\/li>\n<li>Protozoa: Malaria, Amoebiasis<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Question_3_How_do_microorganisms_help_in_making_curd_and_bread\"><\/span>Question 3: How do microorganisms help in making curd and bread?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Microorganisms like bacteria help in making curd by converting milk into curd. Yeast, a type of fungus, helps in making bread by producing carbon dioxide, which makes the dough rise.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_4_What_role_do_microorganisms_play_in_cleaning_the_environment\"><\/span>Question 4: What role do microorganisms play in cleaning the environment?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Microorganisms help in decomposing dead plants and animals. This process recycles nutrients back into the soil, cleaning the environment and enriching the soil.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_5_How_can_microorganisms_be_harmful\"><\/span>Question 5: How can microorganisms be harmful?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Microorganisms can cause diseases in humans, animals, and plants. They can also spoil food, making it unsafe to eat.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_6_What_are_antibiotics_Give_an_example\"><\/span>Question 6: What are antibiotics? Give an example.<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Antibiotics are medicines that kill or stop the growth of harmful microorganisms. An example of an antibiotic is penicillin.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_7_What_is_fermentation_Name_a_product_made_by_this_process\"><\/span>Question 7: What is fermentation? Name a product made by this process.<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Fermentation is a process where microorganisms convert sugars into alcohol or acids. An example of a product made by fermentation is yogurt.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_8_How_can_we_preserve_food_from_spoilage_by_microorganisms\"><\/span>Question 8: How can we preserve food from spoilage by microorganisms?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> We can preserve food by methods such as refrigeration, canning, drying, salting, and adding preservatives. These methods slow down or stop the growth of microorganisms.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_9_Why_is_it_important_to_take_a_full_course_of_antibiotics\"><\/span>Question 9: Why is it important to take a full course of antibiotics?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> It is important to take a full course of antibiotics to make sure all the harmful microorganisms are killed. If the course is not completed, some microorganisms may survive and become resistant to the antibiotic.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Question_10_How_do_vaccines_work\"><\/span>Question 10: How do vaccines work?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>Answer:<\/strong> Vaccines work by stimulating the body&#8217;s immune system to recognize and fight specific microorganisms. They contain weakened or dead microorganisms that prepare the immune system to defend against future infections.<\/p>\n<p style=\"text-align: center;\"><button style=\"width: 50%;\"><a class=\"btn btn-primary\" href=\"https:\/\/infinitylearn.com\/one-stop-solutions-for-school-prep?utm_source=surge&amp;utm_medium=interlinking\"><strong>One Stop Solutions for School Preparation<\/strong><\/a><\/button><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_Class_8_Science_Chapter_2\"><\/span>NCERT Solutions Class 8 Science Chapter 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Many students find science to be a difficult subject. To avoid this circumstance, students should begin brushing up on their understanding of this subject months in advance. A pupil should ideally read the full <strong>NCERT book<\/strong>. It is also necessary to learn and practice questions on a regular basis. Class 8 Science Chapter 2 is a tough place for many pupils. If you are one of those students, you should get the <a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/\"><strong>NCERT Solutions Class 8 Science<\/strong><\/a> Chapter 2 pdf from the links provided on this website.<\/p>\n<p>INFINITY LEARN team knows that even the brightest student would not be able to solve all of the questions. This is why they give students with NCERT Solutions Class 8 Science Chapter 2 downloaded files. But what if you want to dig deeper? What if you want to start from the beginning and learn the chapter?<\/p>\n<p>In that scenario, you might enroll in INFINITY LEARN online classes. INFINITY LEARN teachers are all highly gifted, informed, and experienced. Furthermore, the classes are designed to follow the <a href=\"https:\/\/infinitylearn.com\/surge\/cbse\/\"><strong>CBSE<\/strong> <\/a>curriculum. In a classroom, this gives the learner a lot of flexibility to explore.<\/p>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Class_8_Science_NCERT_Solutions_for_All_Chapters\"><\/span>Class 8 Science NCERT Solutions for All Chapters<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"h1-banner-title\">\n<ul>\n<li><strong>Chapter 1 Crop Production and Management<\/strong><\/li>\n<li><strong>Chapter 2 Microorganisms: Friend and Foe<\/strong><\/li>\n<li><strong>Chapter 3 Synthetic Fibres and Plastics<\/strong><\/li>\n<li><strong>Chapter 4 Materials: Metals and Non-Metals<\/strong><\/li>\n<li><strong>Chapter 5 Coal and Petroleum<\/strong><\/li>\n<li><strong>Chapter 6 Combustion and Flame<\/strong><\/li>\n<li><strong>Chapter 7 Conservation of Plants and Animals<\/strong><\/li>\n<li><strong>Chapter 8 Cell \u2013 Structure and Functions<\/strong><\/li>\n<li><strong>Chapter 9 Reproduction in Animals<\/strong><\/li>\n<li><strong>Chapter 10 Reaching the Age of Adolescence<\/strong><\/li>\n<li><strong>Chapter 11 Force and Pressure<\/strong><\/li>\n<li><strong>Chapter 12 Friction<\/strong><\/li>\n<li><strong>Chapter 13 Sound<\/strong><\/li>\n<li><strong>Chapter 14 Chemical Effects of Electric Current<\/strong><\/li>\n<li><strong>Chapter 15 Some Natural Phenomena<\/strong><\/li>\n<li><strong>Chapter 16 Light<\/strong><\/li>\n<li><strong>Chapter 17 Stars and the Solar System<\/strong><\/li>\n<li><strong>Chapter 18 Pollution of Air and Water<\/strong><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Class_8_Science_Chapter_2_NCERT_Solution_-_Free_PDF_Download\"><\/span>Class 8 Science Chapter 2 NCERT Solution &#8211; Free PDF Download<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Final examinations are approaching quickly, and if a student wants to excel, now is the time to begin studying Ncert answers for <strong>Class 8 Science Chapter 2 Microorganisms Friend and Fo<\/strong>e. Once you&#8217;ve finished this chapter, you should move on to the next one. You may download NCERT solutions for Class 8 Science Chapter 2 Microorganisms Friend and Foe by clicking on the pdf link provided below.<\/p>\n<p>But what if a student requires further assistance in comprehending the course material? In that scenario, the student should become a INFINITY LEARN subscriber. We have some of the greatest teachers and educators at INFINITY LEARN who can assist students reach new heights.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Microorganisms_Chapter_2_Class_8_Friend_and_Foe\"><\/span>Microorganisms (Chapter 2) Class 8: Friend and Foe<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Take a look around and take note of what you notice. Chairs, desks, books, technological devices, and other people are all plainly visible. What you can&#8217;t see, though, is the amazing world of microbes that are always present.<\/p>\n<p>Some of these bacteria are beneficial to your health and assist you in living a healthier life. Some germs, on the other hand, inflict illness and damage to man-made materials.<\/p>\n<p>This presents a slew of new issues, such as which germs are beneficial and which are harmful. What are the functions of beneficial microorganisms? What are the ways that harmful germs harm us? Students will learn the answers to all of these questions and more in Chapter 2 of Science Class 8.<\/p>\n<p><strong>Also Check Other Subjects As Well:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/maths\/\"><strong>NCERT Solutions for Class 8 Maths<\/strong><\/a><\/li>\n<li><strong><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/\">NCERT Solutions for Class 8 Science<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/social-science\/\">NCERT Solutions for Class 8 Social Science<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/english\/\">NCERT Solutions for Class 8 English<\/a><\/strong><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"A_weighted_average_of_Ch_2_Science_Class_8_marks\"><\/span>A weighted average of Ch 2 Science Class 8 marks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Students may be asked questions from this chapter for one, two, three, four, or even five points. Students should solve all of the NCERT questions and practice all of the diagrams several times. The strategy needed to answer any question would be determined by the total score. As a result, a student must practice a wide range of questions from a variety of credible sources.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Benefits_of_NCERT_Solutions_Class_8_Science_Chapter_2\"><\/span>Benefits of NCERT Solutions Class 8 Science Chapter 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>INFINITY LEARN has been able to assist students with Class 8 Science Chapter 2 solutions with the help of our excellent professors. There are numerous advantages to using this tool for pupils. Some of these advantages are listed below.<\/p>\n<ol>\n<li>Highly accurate solutions have been prepared by a team of subject specialists.<\/li>\n<li>CBSE guidelines have been strictly followed to answer all the questions<\/li>\n<li>Students can easily view the answer plus the detailed descriptions of every question<\/li>\n<li>The solutions are available in a PDF file that can be downloaded on any device for free.<\/li>\n<li>Following the solutions and guidelines would allow the students to get maximum marks.<\/li>\n<\/ol>\n<p>These benefits will ensure that students are able to grow and become better learners.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/infinitylearn.com\/foundation-course-for-class-8?utm_source=surge&amp;utm_medium=interlinking\" target=\"_blank\" rel=\"noopener\"><button><strong>Enroll now to Online Class 8 Foundation Course<\/strong><\/button><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_8_Science_Chapter_2_FAQs\"><\/span>NCERT Solutions for Class 8 Science Chapter 2 FAQs<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_the_main_focus_of_NCERT_Class_8_Science_Chapter_2\"><\/span>What is the main focus of NCERT Class 8 Science Chapter 2?<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\tThis chapter explores the role of microorganisms in our lives, discussing how they can be both beneficial and harmful.\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_microorganisms\"><\/span>What are microorganisms?<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\tMicroorganisms, often referred to as microbes, are tiny living organisms that cannot be seen with the naked eye.\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=\"How_are_microorganisms_classified_in_this_chapter\"><\/span>How are microorganisms classified in this chapter?<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\tMicroorganisms are classified into four major categories: bacteria, viruses, fungi, and protozoa.\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_beneficial_roles_of_microorganisms\"><\/span>What are the beneficial roles of microorganisms?<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\tMicroorganisms have several positive roles, including in food production, medicine, waste management, and even in agriculture.\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=\"How_can_microorganisms_be_harmful\"><\/span>How can microorganisms be harmful?<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\tMicroorganisms can cause diseases in humans, animals, and plants, leading to infections and other health issues.\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=\"Can_you_provide_examples_of_beneficial_microorganisms\"><\/span>Can you provide examples of beneficial microorganisms?<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\tYes, some examples are bacteria used in curd formation, yeast in bread-making, and nitrogen-fixing bacteria in soil.\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=\"How_do_microorganisms_spoil_food\"><\/span>How do microorganisms spoil food?<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\tMicroorganisms can spoil food by breaking it down, causing unpleasant odors, tastes, and textures.\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=\"Why_are_antibiotics_important\"><\/span>Why are antibiotics important?<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\tAntibiotics are substances that can kill or inhibit the growth of harmful bacteria, helping to treat bacterial infections.\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 the main focus of NCERT Class 8 Science Chapter 2?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"This chapter explores the role of microorganisms in our lives, discussing how they can be both beneficial and harmful.\"\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 microorganisms?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Microorganisms, often referred to as microbes, are tiny living organisms that cannot be seen with the naked eye.\"\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\": 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