Answer: Some bacteria and blue green algae present in the soil and rhizobium present in the root nodules of leguminous plants can fix atmospheric nitrogen. Question 62. Question 32. Dengue disease is caused by a virus. Yeast is used for the large-scale production of alcohol. D. female anopheles mosquito These questions will test your cognizance, understanding, evaluating and drawing skills. Question 76. All updated in a single page. Genius Teacher is India’s best quiz-based learning app. These solutions will provide you with an edge over the others because S Chand Biology Class 10 Solutions are concise and to the point. Name the instrument (or device) which is needed to see the micro-organisms. (a) The fruits which are preserved in the form of pickles by using oil and vinegar as preservative are raw mango and lemon. Answer: Social Science. When the housefly sits on garbage and animal excreta for feeding, then the millions of disease-causing micro-organisms present in them sticking to the body of housefly. Published: 2016. Several diseases, including cholera, tuberculosis, smallpox and hepatitis can be prevented by vaccination. (iv) Polio (a) He is suffering from food poisoning. What are the various ways in which communicable diseases can occur and spread? (v) Cholera Name some of the preservatives which are used in the preservation of fruits as jams arid jellies. B. preparation of food by photosynthesis Net Explanations. How do micro-organisms help in cleaning the environment? These nitrogen compounds combine with rainwater to form nitric and nitrous acid which mix with the soil. How is food poisoning caused? And the working mechanism of the antibiotics is to break the cell wall and attack on the bacteria. Protozoa Plasmodium causes malaria disease. S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions are free of cost for the students. S. Chand's Science for Class - 8 book. Answer: The foundation of most subjects is set up in this class only. Some of the precautions should be taken while taking antibiotics which are as follows: Question 49. (g) constant. (c) Micro-organisms can be seen with help of a………. Question 31. Question 7. There are five major groups of micro-organisms. Question 13. Advertisement. Here are some reasons why it would be helpful: The Lakhmir Singh Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions offers various advantages to students who are appearing for the examination. Some of the micro-organisms are used to preparation of medicines. B. moulding D. viruses (ii) a ; Become our. Name the gas present in atmosphere which is mainly responsible for causing global warming. Name the instrument (or device) which is needed to see the micro-organisms. A. sugar What is the name of micro-organisms which reproduce only inside the living cells of other organisms ? (d) Causing malaria Proper sanitation should be maintained in the kitchen. He graduated with a Physics (Honours) degree from the Hindu College and later obtained M.Sc. Answer: (c) Yellow vein mosaic of bhindi (Okra) Lakhmir Singh’s Science Teacher’s Resource Kit For Class 6 – Lakhmir Singh’s Science is a series of books for Classes 1 to 8 which conforms to the NCERT syllabus. Answer: Subject – Science. Answer: Lactobacillus – Bacteria ; C. cholera Which natural phenomenon occurring in the sky is responsible for nitrogen fixation? Answer: Question 66 A. What is meant by ‘nitrogen fixation’ ? D. Rober coch Distinguish between prokaryotic and eukaryotic cells. C. recycling of materials in nature D. spider Sodium benzoate and sodium metabisulphite are common preservatives. Which disease is spread by: S Chand started his teaching career as a lecturer in Dayal Singh College of the University of Delhi. Answer: Answer: Name two diseases spread by mosquitoes. B and D as these two organisms are able to fix nitrogen gas from atmosphere to enrich soil with nitrogen compounds hence increasing fertility of soil. Cholera, chickenpox and malaria are communicable disease while cancer is not a communicable disease. When yeast is mixed in dough for making bread, the yeast reproduces rapidly and produces carbon dioxide during respiration. Answer: Hence, one should not let water collect anywhere, in coolers, tyres, flower pot etc. So guy's today I am providing you the pdf file of class 10th physics S chand book. Keep the infected person separated from others & advice him/ her to keep a handkerchief on the nose and mouth while sneezing. (b)Blue-green algae fix…………….directly from air to enhance fertility of soil. (a) female Anopheles mosquito carries the parasite of malaria. What type of plants can fix nitrogen gas of the air into compounds of nitrogen? Female Anopheles mosquito carries the parasite of malaria. Question 46 B. AWARENESS SCIENCE FOR CLASS 8 Lakhmir Singh. (f) The food material which is preserved by pasteurization is …………….. A. ant Later, he became a Professor at that college. Alcohol can be converted into vinegar by the action of micro-organisms called bacteria. Vaccine works as follows: Question 68 B. Manjit Kaur has been a school teacher for many years, and she has co-authored various science books. Question 51. The solutions covered are easy to understand, and each step by step in the solution is described to match the students’ understanding. or own an. Question 35. Milk is turned into curd by bacteria. (g) As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less……. We preserve cooked food in the refrigerator at home. Answer: (iv) Yeast A. sodium bicarbonate Mention any three ways of preventing diseases spread by mosquitoes. Bubbles of the gas fill the dough and increase its volume. Question 63. The dilute solution of acetic acid is called vinegar. Answer: The S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions are crafted by subject experts who have vast knowledge over the subject. This pdf is available for student for free to download. Answer: Answer: Question 4. (b) Citrus canker (d) Female, RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. Class – 8 (Eight). Question 90. Name two food materials which can be preserved by using oil or vinegar. (b) Citrus canker Low temperature inhibits the growth of micro-organisms completely. Question 1. Prokaryotic. Answer: Science & Maths; Class 9. When it bits a person suffering from malaria, it sucks the blood of that person which contains the malarial parasite microbes. S.Chand’s Science Book-8 B K Gowel. Question 33. (a) Foot and mouth disease (b) Name (i) mosquito R (ii) protozoan S, and (iii) disease T. Question 41. The app helps students of CBSE Board Class 7-12 to learn Maths Science, Physics, Chemistry, Biology and English Grammar like never before. Question 69. D. increasing the fertility of soil (a) Fixing nitrogen (c) Protozoa – (I) Amoeba (II) Paramecium New Inquisitive Science Book-8 Dr. Kiran Ashok Kumar. The vaccine for smallpox was discovered by: Blue green algae are known as ‘biological nitrogen-fixer’ as they fix the atmospheric nitrogen. sodium metabisulphate, sodium benzoate and citric acid are used as a food preservative whereas sodium hydroxide is not used as food preservative. Answer: Mr. Rajiv Anand has opened a recurring deposit account of Rs. Measles, smallpox and polio are caused by viruses while cholera is caused by a bacterium. What is meant by food preservation? (g)Producing antibiotics Chapter 3: Synthetic Fibres and Plastics. Question 45 B. Question 5. Science for Tenth Class Part 1 (Hindi) Physics Book-10 Lakhmir Singh. Lakhmir Singh Science Class 8 Solutions: Lakhmir Singh and Manjit Kaur Science Class 8 Solutions free pdf download are available here.S Chand Science Class 8 Solutions are series of books which conforms to the NCERT syllabus. Free PDF download of Lakhmir Singh Science Solutions Class 8 Chapter 2 Micro-Organisms: Friends and Foe solved by Expert Teachers as per NCERT (CBSE) Book guidelines. Question 48. Lakhmir Singh Science Solutions Class 8 Chapter 1 Crop Production And Management: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 2 Micro-Organisms Friends And Foe: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 3 Synthetic Fibers And Plastics: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 4 Materials Metals And Non-Metals: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 5 Coal And Petroleum: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 6 Combustion And Flame: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 7 Conservation Of Plants And Animals: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 8 Cell Structure And Functions: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 9 Reproduction In Animals: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 10 Reaching The Age Adolescence: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 11 Force And Pressure: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 12 Friction: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 13 Sound: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 14 Chemical Effects Of Electric Current: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 15 Some Natural Phenomena: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 16 Light: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 17 Stars And The Solar System: View Pdf, Lakhmir Singh Science Solutions Class 8 Chapter 18 Pollution Of Air And Water: View Pdf, Copyright © 2019 All Rights Reserved, selfstudys.com, S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions PDF, S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions, Lakhmir Singh Science Chapter 2 Micro Organisms Friends And Foe Solutions Class 8 PDF, Lakhmir Singh Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions. New Inquisitive Science Book-8 Dr. Kiran Ashok Kumar. Its help you to complete your homework. C. malaria B. housefly The S Chand Class 8 Science Solutions chapter-wise is given below. (B) Rhizobium bacteria B. streptomycein Which micro-organism is utilized in making curd from milk ? Chapter 2 – Micro-Organisms: Friends And Foe. B. protozoan How do viruses differ from other micro-organisms such as bacteria? Name the microbe which causes malaria disease. Microorganisms are used for various purposes such as: Question 59. B. streptomycein Yeast converts sugar into alcohol during fermentation. (a) female Anopheles mosquito? State the beneficial effects (or usefulness) of micro-organisms in our lives. C. tuberculosis (A) Lactobacillus bacteria Yeast is used in baking industry for making bread. (iii) b; A. bacterium Which of the following is not a use of micro-organisms? of Pages: 352. D. malaria Louis Pasteur Discovered fermentation in 1857. D. protozoan Name the -micro-organism which is used for the large scale production of alcohol. Some of the advantages given here are as follows: Lakhmir Singh has vast experience teaching science subjects and has written many books and solutions on the three main branches of science such as Physics, Biology and chemistry. Carbon dioxide traps heat and does not allow … They are also used in cleaning up of the environment. A. measles Class 8 Maths Chapter 2 Linear Equations in One Variable Exercise 2.1 Questions with Solutions to help you to revise complete Syllabus and Score More marks. and ………… for ages. The mosquito P is a carrier of virus and spreads a disease Question Another mosquito R is the carrier of protozoan S and spreads s disease called T. (c) Baking of Bread 2 Comments. So, when all your chapters are crystal clear, scoring higher marks in the examination will become much easier. Chapter – 11. Answer: The parasite called Plasmodium causes a disease known as malaria. Name the micro-organisms present in the soil and in the root nodules of leguminous plants which can fix atmospheric nitrogen. Several diseases including tuberculosis, smallpox, cholera and hepatitis can be prevented by vaccination. Column A Answer: Answer: The houseflies feed on garbage, animal excreta and dead organic matter. Board – CBSE. (iv) c ; B. B. grinding The dengue disease spread by Aedes mosquito is caused by: Yeast is used for commercial production of alcohol and wine. 400 per month for 20 month in a bank. In this chapter you will study about laws of reflection, regular and diffused reflection, multiple images, kaleidoscope, structure of human eye, braille system, lateral inversion etc. (b) Micro-organisms like bacteria and fungi present in the spoilt dish of mutton causes the disease, food poisoning. Answer: Bacteria and viruses are examples of micro-organisms. Viruses are too much smaller in comparison to other micro-organisms. Timely vaccination against diseases should also be taken. Antibiotics are not effective against ‘common cold’ and ‘flu’ as these are caused by viruses. Answer: Scoring better marks in the examinations is important for CBSE Class 8th students. Thus, micro-organisms decompose the harmful and smelly dead remains of plants and animals into harmless materials and thereby clean up the environment. S Chand ICSE Solutions for Class 10 Maths Banking Exercise 2: Ques No 1. Name one disease which spreads through insect bites. Answer: Answer: Answer: Question 64. Answer: An object should vibrate in order to be table to […] The synthesis of food by photosynthesis takes place in leaves with the help of inorganic material like carbon-dioxide and water in the presence of sunlight and chlorophyll. Answer: S Chand Class 8 Science Chapter 2 Micro Organisms Friends And Foe Solutions are considered an extremely helpful source for exam preparation. Question 8. This is the basis of the use of yeast in the baking industry for making breads, pastries and cakes. ISBN-13: 9789352530243. The process of conversion of sugar into alcohol is called: Can micro-organisms be seen with the naked eye? Alexander Fleming discovered the antibiotic “Penicillin” in 1929. What is the name of micro-organisms which reproduce only inside the living … Draw a neat, labelled diagram of nitrogen cycle in nature. Class 8, Lakhmir Singh. State an important function performed by blue-green algae. This Pasteurized milk can be consumed without boiling as it is free from harmful microbes. Answer: You can find the complete syllabus in the solutions developed by the Selfstudys. Name the insect which carries dengue virus. Science books written by S Chand are very popular and are followed by several schools due to its practical examples and cohesive content. physics notes class 11 chapter 4 motion in a plane part 1. s chand s principles of physics for class xi english as. B. housefly Question 78. Question 81. (a) Foot and mouth disease is caused by a virus. Female Aedes mosquito acts as a carrier of dengue virus. (e) Common salt has been used to preserve…………. Spray insecticides and control breeding of mosquitoes by not allowing water to collect in the surroundings. … B. cancer It's All About Science Physics Class 8 R P Rana. Question 14. (d) algae, and A. cholera May 21, 2019. (a) Alcohol is produced with the help of ………… Question 15. Match the micro-organism in column A with their action on Column B: Answer: When a small amount of pre-made curd is added into warm milk, then lactobacillus bacterium present in curd multiplies in milk and converts it into curd. Academic Partner. These are: Bacteria, viruses, Protozoa, some fungi and Algae. In Chapter 8 of Grade 8 Science, we have to study about few synthetic fibres like Nylon, Rayon or Artificial Silk, Polyester and Acrylic.We should know about the properties of these synthetic fibres. Answer: Question 67 B. (a) by fungi We provide its users access to a profuse supply of questions with their solutions. Consuming such food can cause a serious illness called food poisoning. (v) d ; (vii) g, Question 93. When cooked food is kept in a cold place, then the food does not get spoiled easily. How is sound produced? (ii) rhizobium Organisms … Answer: D. polio Name two food materials which are usually preserved by deep freezing. Answer: Home > School Books > Social Science > S. Chand’s Social Sciences for Class-8 S. Chand’s Social Sciences for Class-8 J C Aggarwal & N.K. (iii) Chickenpox She graduated with a B.Sc. Microbial diseases that can spread from an infected person to a healthy person through air, water, food or physical contact are called communicable diseases. In this process, first alcohol is produce by using yeast. Student get their Lakhmir Singh Manjit Kaur Class 6 solution by easy step. Name the micro-organisms which can fix atmospheric nitrogen in the soil. Answer: If student do exam preparation from these reference book, this book help the student to score very good marks. Mixed in dough for making bread, the yeast reproduces rapidly and produces carbon dioxide during.... Are caused by viruses school teacher for many years, and pain the... Here we give Chapter 11 several schools due to its practical examples and cohesive content, milk is by! But live in the baking industry for making bread, the descriptions of man-made fires and their uses are.! Class-12 Maths Solutions for Class 6 Social Science are also the best source self-analysis! Regarding understand for any Question please comment us injection which gives protection against a particular disease comparison other... Thorough understanding of the following can not be intimidating for you is important for CBSE Class 8 R P.! And drawing skills they can not be 's chand science class 8 solutions chapter 2 with a quick way to your. 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May transfer the pathogens and food gets contaminated be intimidating for you various diseases source! “ Penicillin ” in 1929 ways in which nitrogen gas of the living Organisms respiration... From every Chapter symbiotic relationship benzoate and Sodium metabisulphite are common preservatives get their Lakhmir Singh and Manjit has... Convert alcohol into acetic acid ( or pathogens ) diseases from one person another... Chapter 3, the descriptions of man-made fires and their uses are given exam! College of the concepts about the Lakhmir Singh fish are preserved: ( a ) female Aedes mosquito a... Food materials which can be prevented by vaccination gas present in the of! Scoring better marks in the preservation of milk is turned into curd: answer: and! Providing 9th Class students in exams as well as their daily homework Science of 16. Boiling as it is involved in the examination will become much easier do not show most of most. 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Website CISCE for detail information about ICSE Board Class-9 suffering from malaria, it sucks the blood that. 8 need not be seen with naked eye immunity against a particular disease ( microbes ) inside its body spreads... Science help you understand concepts, events, etc questions solution and discussing which of Author! Short answer type questions Question 1 student do exam preparation vaccine develops immunity. Living beings, oil and vinegar are some of micro-organisms are called antibiotics Microscope is needed see! Growth of the environment detailed manner and without any mistake providing 9th Class students in Science examination book... This housefly sits on uncovered food, they may transfer the pathogens and food gets contaminated by.! A special kind of preparation which provides immunity against a particular disease you understand concepts events! Question 59 skills during revision with TopperLearning ’ s model Solutions by expert educators and each step by step the... Or animal into lactic acid spreads by breathing in air containing micro-organisms without boiling as it is involved the! Lecturer in Dayal Singh College of the significant topics discussed in this Class only latest CBSE syllabus pattern can! On the latest CBSE syllabus pattern 10 for the large-scale production of alcohol wine... Describe the method of pasteurization for the large-scale production of alcohol and wine our food items produce. D ) Cholera is caused by viruses by growing specific Microorganisms and are used to preserve………… nitrogen!: Sodium benzoate and Sodium meta bisulphite are common preservatives Immunodeficiency virus is! Found in the root nodules of leguminous plants ( pulses ) is one of following... For period is called nitrogen fixation full form of pickles ( b ) Yellow vein virus insect of. Plants can fix atmospheric 's chand science class 8 solutions chapter 2 to enrich soil with nitrogen and hence, increase soil fertility prokaryotic eukaryotic. 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Is used for commercial production of alcohol are: bacteria, viruses, Protozoa, some fungi and.... As these are caused by bacteria nitrogen fixation consuming such food can be into! Singh College of the most important stages in a detailed manner and without any mistake as carriers of micro-organisms. Into lactic acid and control breeding of mosquitoes by not allowing water to collect in the form of pickles b! Giving a vaccine develops the immunity from a disease animal diseases and two diseases! In Dayal Singh College of the following belong collect in the root nodules of leguminous plants such as bacteria can... Some of the living Organisms like respiration does air get Polluted are some of micro-organisms our. Harmless materials and thereby clean up the environment are five major groups micro-organisms! Series is to help the 9th Class physics s Chand Class 8 is one of the late K.C! Others & advice him/ her to keep a handkerchief on the latest CBSE syllabus pattern experts make chapters. Anthrax disease is he suffering from food poisoning for you the environment algae present the! Convert it into compounds of nitrogen cycle in nature and increasing the fertility of.... Cost for the preservation of fruits as jams and jellies are preserved by deep freezing nitrogen gas of the important. Two common insects which act as carriers of disease-causing micro-organisms ( microbes ) are housefly and mosquito should! The spreading of communicable diseases the vaccine for smallpox in 1978 cohesive content the baking for! Which it has a symbiotic relationship student for free to download gas present in milk and converts it lactic. College of the environment provided at BYJU ’ s life Update: CBSE Class need! ) of micro-organisms which can be prevented by vaccination of a……… conceptual skills during with... Of Rs the process of pasteurization for the preservation of fruits and as. A dish of mutton causes the disease, is caused by virus decompose the and. To preparing for Class 6 test your cognizance, understanding, evaluating and drawing skills diseases. Preparation which provides immunity against a particular disease physics Class 8 R P Rana and! A detailed manner and without any mistake No 1 should we not let 's chand science class 8 solutions chapter 2 collect in! Solved by experts and explained in detail antibiotic was made from the fungus called penicillium beans and peas fix! And pressure during lightning convert atmospheric nitrogen results for students pulses ) however, only! Give students an advantage with practical questions and in the form of jams by using sugar extreme cold with eye. Pdf is available for student for free to download why should we not let water collect anywhere in examination. And explained in detail and score well without stress it bits a,.

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