(b) Question 12. Question 6. What is sterilisation? (a) Algae – Spirogyra, Chlamydomonas As a member, you'll also get unlimited access to over 83,000 lessons in math, English, science, history, and more. Spherical-shaped bacteria are called If the answer is not available please wait for a while and a community member will probably answer this The role of sugar in food preservation is significant. We do not use only Yes or No to answer a question. Fermentation makes idli fluffy and dosa crispy, and change the flavour. It’s very important to keep in mind that antibiotics must be taken only on the advice of a qualified doctor. Yeast is used in the production of alcohol, wine, beer and other beverages. The lesson covers the complete explanation of class 8 Chapter 2 Microorganisms.Topics covered are Introduction to Micro-organisms and microbiology, different types of Micro-organisms, Useful and Harmful Micro-organisms.. How to avoid spreading of Micro-organisms has been discus (c) 1. (e) Aeeessrrwtip are added to food to prevent growth of microorganisms. Medicine that kills or stops the growth of harmful disease-causing microbes is known as Download a PDF of free latest Sample questions with solutions for Class 9, Biology, CBSE- Why do we fall ill . Question 11. We use a _______ to see the microorganisms. 7. 5. 8. Name the groups in which microorganisms are broadly classified. However, a short answer does not need to entirely restate a question. Match the items given in column I suitably with those given in column II. In microorganism class 8 notes, the classification of microbes and their various characteristics along with chapter MCQs are discussed. (a) transformation Flu, cough and cold are caused by _______. Question 10. False This is because yeast celj releases C02 during respiration which inflates the balloon and C02 present inside the balloon changes lime water milky. (b) Yeast People are searching for an answer to this question. Pathogens have the ability to make us sick, but when healthy, our bodies can defend against pathogens and the illnesses they cause. Next time when one falls sick and needs that antibiotic, it will be less effective. Unscramble the jumbled words underlined in the following statements Teachers in the classroom and at home are sure to find our materials very useful. is done on EduRev Study Group by Class 8 Students. NCERT Exemplar Class 12 Biology is very important resource for students preparing for XII Board Examination. Answer: All the best, and keep an eye out for more tests like this. Noninfectious diseases are not caused by pathogens. They can be either bacteria or virus or fungi or a protozoan or even a helminth. What is the difference between Rhizobium and cyanobacteria in the way of fixing nitrogen for the plants? Watch the setup every day for next 3-4 days. They inhabit virtually every environment on the planet and the bacteria carried by an average human, mostly in their gut, outnumber human cells. Answer 3 Sagar Rana Subject: Hindi, asked on 24/5/18 Please answer the following question quickly. Test this Bloodborne Pathogens knowledge with our BBP Practice Test as great way to prepare you for our official BBP online exam. (b) What will happen to the food if it is not refrigerated? These notes are helpful to revise the huge syllabus in a short time and make an … By making direct contacts with an infected person, pathogens are transferred to a healthy person. (d) What value of Seema is shown here? NCERT Solutions for Class 8 shall be provided for all the students who are studying in Class 8.The solutions will be for all the subjects which are taught to the students at this level. (c) antibody Carriers take with them many harmful microorganisms or pathogens. 4. Answer: (a) bacilli (d) Cells of our body produce santiidobe to fight pathogens. Pathogens can be of different types. 2. (c) both (a) and (b) (b) Answer: (b) You … Question from very important topics are covered by NCERT Exemplar Class 8.You also get idea about the type of questions and method to answer in your Class … (d) Rahul’s mother is intelligent, economical, have scientific aptitude towards preservation of food. After having their meal, they found that many food items were left over. 13. Record your observations and think of an explanation. Question 19. Yeast is a _______ fungus. These pathogens include, but are not limited to, hepatitis B (HBV), hepatitis C (HCV) and human immunodeficiency virus (HIV). By adding sugar in the food item, we reduce its moisture content and hence, it stops the growth of the microorganisms. (a) The methods used for prevention of spoiling of food by the action of microbes is called food preservation. NCERT Book for Class 8 Social Science (History) Chapter 4 Tribal, Dikus and The Vision is available for reading or download on this page. The process of formation of curd from milk is known as the _______ of milk. (c) antigen The process in which food is deteriorated to such extent that it does not remain fit for human consumption is known as food spoilage. (d) What value of Rahul’s mother is shown here? Answer: Microorganisms are broadly classified in four groups: bacteria fungi protozoa algae Question 2. Class 8 Microorganisms Friend And Foe Short Answer Questions 1.Unscramble the jumbled words underlined in the following statements. Answer: Name any two human diseases caused by viruses. 2. Differentiate between acute and chronic diseases. 9. A protozoan called Plasmodium is responsible for malaria. 6. The structure of a short answer is important. Antibiotics are medicines created to fight infections caused by bacteria. All the microorganisms are harmful. Our online education trivia quizzes can be adapted to suit your requirements for taking some of the top education quizzes. Humans have an immune system, which can defend them from pathogens. (b) Fungi – Aspergillus, yeast What do you mean by food spoilage? (b) germs Pathogens may be viruses, bacteria, protists or fungi. Organ specific manifestation is of two types, portal related. In this way, malaria is transmitted to humans. Hence they increase the fertility of the soil. (a) What is food preservation? In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is any organism that can produce disease.A pathogen may also be referred to as an infectious agent, or simply a germ.. Rahul’s mother kept these leftovers in a air-tight container and refrigerate them. Question 6. Project: Requirements 2 test tubes, marker pen, sugar, yeast powder, 2 balloons and lime water. Answer: (a) Bacteria and fungi, Question 20. Saprophytes and _______ are the two main categories of fungi. Answer: Question 14. Question 10. Viruses False Answer: The process of killing all the microorganisms above the temperature of 100°C is known as sterilisation. She kept the mixture in fridge. Answers of Name the chemicals which kill or stop the growth of pathogens Related: Short Answer Questions (Part - 1) - Microorganisms : Friend And Foe? (b) vibrio Lower temperature of fridge retarded the growth of Lactobacillus in the mixture. Very Short Answer Type Questions Q.1. These questions are often called ‘comprehension’ questions and they are very common in English classrooms all over the world. 9. Whenever any harmful disease-causing microorganism enters the human body, the body produces substances to fight with the entered microbe. Answer: Microscope is needed to see the micro-organisms. This discussion on Name the chemicals which kill or stop the growth of pathogens Related: Short Answer Questions (Part - 1) - Microorganisms : Friend And Foe? Answer: Define Ohmic heating. (a) Tuberculosis 8. parasites (a) multicellular 8. What are microorganisms? Pull out a gram or bean plant from the field. Thus, it prevents spoilage of food. Answer: Question 7. Name the two microbes that are involved in the process of decomposition. Bacteria, fungi, protozoa and _______ are the major four groups in which microorganisms are classified. Fit the balloon on the test tube and shake well. Also, one should finish the prescribed course of antibiotics given by the doctor. Exercise 8 of 30 focusing on the English articles A, AN, and THE. You can also get complete NCERT solutions and Sample papers. Answer: Question from very important topics are covered by NCERT Exemplar Class 12.You also get idea about the type of questions and method to answer in your class … They inhabit virtually every environment on the planet and the bacteria carried by an average human, mostly in their gut, outnumber human cells. (a) rod-shaped Question bank for Class 8. ), fungi, parasitic worms (flatworms and roundworms), and prions.While these pathogens cause a variety of illness ranging from minor to life-threatening, it is important to note that not … Microorganisms are broadly classified in four groups: Question 2. Answer: Pathogens have evolved many strategies to avoid host defenses In some infections the immune response is part of the problem: it can cause tissue damage or, in some cases promote pathogen replication Each example teaches us about the nature of the immune response and some of its potential weaknesses Why do use short answers? Oil seals off the air from the item that is being pickled and thus inhibit the growth of most of the microorganisms. Short Answer Questions (3 Marks) Question 1. (c) What is the role of refrigeration in food preservation method? Answer: Question 5. Free Online Mock Test for CBSE Class 8 for important topics of all chapters in CBSE Class 8 book. 9. Answer: They are transmitted to a healthy person while breathing. This brief English test for 8th class entails all that is covered so far and will help you test out your skills. (a) You will find round struc¬tures called root nodules on the roots. Her teacher asked her to take rest at home and use handkerchief while sneezing and coughing. Carriers of pathogens also help in their transmission. Choose the correct option. Classify bacteria on the basis of their shapes. A.1. True Question 4. This contaminated food items cause serious diseases when it is eaten by a healthy person. 12. What is decomposition? (a) (a) We should keep a handkerchief on nose and mouth while sneezing or coughing because fine drop¬lets carrying thousands of viruses or bacteria spread in the air. It is ready to study material for class 8 students. Some pathogens exist as airborne particles. Answer: Answer: The Questions and Rust of wheat, citrus canker and wilt, Question 15. For this, she took lukewarm milk, mixed some curd into it and stir well. (a) yeast Question 9. Do it yourself. Others, however, are either obligate or facultative pathogens … We do not use only Yes or No to answer a question. Answers may or may not be case sensitive. Such an unhygienic condition lead to spoilage of food which when consumed can lead to serious illness. Question 2. Very Short Answer Type Questions. Virus, Question 3. Give one example each of acute and chronic diseases, Mention any two causes of baby’s disease. (b) The food will get spoil and emit bad smell with changed colour or taste. (i) Pasteurisation can be defined as the partial sterilisation of foods at a temperature that destroys harmful microorganisms without major changes in the chemical property of the food. Question 12. When the ELISA test was conducted on an immune 7. Question 1. These notes are helpful to revise the huge syllabus in a short time and make an … What is the difference between refrigeration and freezing? Hence they are harmful to us. All types of questions are solved for all topics. (a) immune If one takes an an¬tibiotic when not required or overuse it, then it will help bacteria in one’s body to develop resistance to the given antibiotic. Answer: Curd did not set because she kept the mixture in fridge. Pathogens are also called Vaccines are products that protect people against many diseases that can be very dangerous and even deadly. Define food preservation. (d) carrier, Question 6. Question 7. Observe and explain. Name the chemicals which kill or stop the growth of pathogens. 3. 3. microscope In refrigeration, the storing of the food is done at a temperature of 0°C to 5°C, whereas freezing is used to store food at -18°C of temperature. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Bloodborne pathogens are infectious microorganisms in human blood that can cause disease in humans. (a) germs She obeyed her teacher. Pathogens are microscopic organisms that cause or have the potential to cause disease. Question 18. Check the below NCERT MCQ Questions for Class 8 History Chapter 1 How, When and Where with Answers Pdf free download. Define communicable diseases. 2. State with examples why a few pathogens are organ/tissue-specific. 8. 12. This method also involves the removal of oxygen gas, and to avoid post-process contamination by airtight sealing of food items. (b) Visit a dcotor. Question 11. (c) viruses Put two spoonfuls of sugar in each of the test tubes. Medium that transmits pathogens from an infected person to a healthy one is called 4. Tiny organisms which cannot be seen with the naked eyes are called The process of putting a vaccine inside the body of a person in order to produce immunity against some disease is called vaccination. Pathogens have the ability to make us sick, but when healthy, our bodies can defend against pathogens and the illnesses they cause. _______ are curved-shaped bacteria. True (a) Curbossulite is an air-borne disease caused by a bacterium. 11. 7. (e) Preservatives. They play a great role in transferring these pathogens to a healthy person, by sitting on the food items, or directly transferring the pathogens inside the body of a person. High quality reading comprehension worksheets for all ages and ability levels. Jan 23,2021 - Name the chemicals which kill or stop the growth of pathogens Related: Short Answer Questions (Part - 1) - Microorganisms : Friend And Foe? If the cell is infected with a virus, these pieces of peptide will include fragments of proteins made by the virus. (c) Protozoa – Paramecium, Amoeba. _______ are the threads of the multicellular fungi. Name the first antibiotic discovered. This is not polite. Question 6. Edward Jenner. These pathogens generally enter the human body from contaminated drinking water and cause many water-borne diseases like cholera, typhoid, jaundice, hepatitis etc. Some bacteria, which are present in the root nodules of leguminous plants or free-living fix the atmospheric nitrogen in the soil which is ultimately used up by the plants. Keep them in a warm place, away from sunlight. Rhizobium lives in the root nodules of leguminous plants in a symbiotic relationship whereas cyanobacteria lives freely in the soil and fixes nitrogen. 10. True when was the cricket happier class 8. 4. Microorganisms: Friend and Foe Class 8 Extra Questions Science Chapter 2 Microorganisms: Friend and Foe Class 8 Extra Questions Very Short Answer Questions Question 1. The healthy person then gets an attack of malaria. Disease-causing microorganisms are known as pathogens. Vibrio Answer: A substance which is used in the production of immunity against various diseases in the living body is termed as vaccine. (b) fungi Without a subject and an auxiliary verb, a short answer is not a full answer. Question 3. Question 1. View Answer Ans: The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms.Nitrogen is present in the environment in a wide variety of chemical forms including organic nitrogen, ammonium (NH4+), nitrite (NO2-), nitrate (NO3-), nitrous oxide (N2O), nitric oxide (NO) or inorganic nitrogen gas (N2), atmospheric nitrogen needs to be processed … (d) microbes, Question 5. (d), IV. The vast majority of microbes are harmless to us, and many play essential roles in plant, animal and human health. What is fermentation? (c) Do you think Seema’s teacher decision was right? Microbes are found on us, within us and around us. Ria thought of making curd. Can you tell why the curd did not set? (d) protozoa, Question 10. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. Answer: What is pasteurisation? Name the type of microorganism … 10. Answer: Why do idli and dosa maker add some yeast or old batter of pervious day to the newly-made batter and keep it for one day? Short Answer Patterns . (c) Definitions Immunisation describes the process whereby people are protected against illness caused by infection with micro-organisms (formally called pathogens). The process in which sugar in the food is transformed into alcohol and carbon dioxide by using microorganisms is known as 4. Who discovered the vaccine for small pox? 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