Question 3. Some microorganisms grow on other organisms, some of them exist freely, some of them live alone, and some microorganisms live in colonies, which means that microorganisms live with similar communities. True They cause several diseases in human beings, animals, and plants which can even lead to death. Some bacterias are helpful in the manufacturing of antibiotics like penicillin. _______ are the microorganisms that help in the process of decomposition. Quiz for class 11, Chapter wise (c) spirilla Answer: To kill or stop the development of the disease-causing microbes, antibiotics are the medicines which are majorly used. /* MARKETING SCRIPT */?> 1. Well, the aim is to wash off Microorganisms also known as Microbes. All solutions and extra or additional solved questions for 2. 7. Microorganisms or microbes are extremely small living organisms which cannot be seen with the naked eyes. Answer: for Math's, Worksheet It lives in the liver and blood of the person who has been infected by this disease. Mosquitoes act as carriers of many disease causing microorganisms. (d) carrier, Question 6. Microorganisms are harmful as they cause many diseases. (a) yeast 10, CBSE If you continue to use this site we will assume that you are happy with it. Algae tend to develop on wet surfaces. 2. (b) antibody. Online Quiz Class 9, Chapter wise your Doubts, Class Name the two microbes that are involved in the process of decomposition. Dehydration means removing water or moisture from food. How can we control them? Pathogens include bacteria, viruses, fungi & protozoa. 2. (b) Xanrhat is a dangerous bacterial disease. In this way vaccination helps in protecting the children from diseases. 14. The revision notes help you revise the whole chapter 2 in minutes. The Microorganisms can be Broadly Classified as: Bacteria - They are a group of prokaryotic organisms (does not have membrane-bound nucleus or organelles) that constitute a major part of microorganisms. Question 4. Answer: i. Microorganisms are found everywhere and there is no plant or animal that doesn't harbor some type of microorganism. 15. Some bacteria promote curd formation. Lactobacillus is a friendly-bacterium. Sun Drying: This is a traditional method of food preservation. The size of bacteria ranges from 0.2 micron to 100 microns. Introduction of Micro-organisms and microbiology, The living organisms that you fail to see with your eyes and which can be seen only with the microscope are called as. This method also involves the removal of oxygen gas, and to avoid post-process contamination by airtight sealing of food items. Answer: 8. Class 8 Science Microorganisms Chapter 2 (3/5) Useful Microorganisms Explanation in Hindi, Imp Questions and Answers. Disease-causing microorganisms are known as pathogens. What do you mean by immunity? Aggarwal solution, RD There are many microbes which cause several diseases in plants, animals & human beings. Answer: Microorganisms have flexible adaptability, that means they can survive in almost all areas or environments. (b) What are the modes of transfer of diseases from infected to healthy person? 4. Vibrio Rhizobium bacteria present in the roots of pulse plants fixes nitrogen from the air and supplies nitrogen compounds to the pulse plants. (a) Tuberculosis Your class 8 Doubts, Class But, however, antibiotic will work if we get attacks of viral infection and bacterial disease at the same time. How is food preserved from the attack of microorganisms? Ria thought of making curd. (d) tricellular, Question 7. 8 Math Notes, Class 8 Write a short paragraph on the harms caused by microorganisms. (g) 5) Answer: Microorganisms are present in all types of environments ranging from ice cold climate to hot springs, deserts and marshy lands. Microorganisms are classified into four major groups that are Bacteria, Fungi, Protozoa and Algae. Excess dose of antibiotics also kills friendly microbes inside our body and thus helps to flourish patho-genic microbes. This is because yeast celj releases C02 during respiration which inflates the balloon and C02 present inside the balloon changes lime water milky. Friendly Micro-organisms Application Videos. They cannot absorb nitrogen directly from the air. (b) Yeast You can easily learn about various forms of microorganisms and . 4. 3. Question 1. (c) bicellular What is the amount of nitrogen in the atmosphere? Question 1. Following changes lead to the formation of curd from milk: Canning is a process used for food preservation. Sun-drying helps in removing moisture from food. Answer: (a) 5. Microorganisms include viruses and single-celled organisms like bacteria, yeast, protozoans and algae. (d) carbon dioxide. Microorganisms like bacteria and fungi grow in the food and produce poisonous (toxic) substances in the food. What is its effect? 4. 7. Their body shape may be irregular, oval, spherical, etc. We can also say that. Viruses cannot be killed by using antibiotics as their cell pathways are different from that of bacteria. Answer: Influenza (Flu), Polio and Chicken Pox are some diseases caused by viruses. Anopheles mosquito carries the parasite of malaria. True They reproduce only inside the cells of other organisms. MICROORGANISMS AND VIRUSES - Friends and Foes! Answer: (d) protozoa, Question 10. Answer: (c) Refrigeration retards or slow down the growth of microorganisms and enzyme activity on food. 7. Such an unhygienic condition lead to spoilage of food which when consumed can lead to serious illness. 1) Microorganisms are considered friends and enemies of human beings. 6. 2. 3. Chemical Method: Some chemicals prevent the growth of microorganisms in food. This stops microorganisms from growing as they cannot grow without water. smartech('register', '6ff79e6140cd0fd5d1c68cbc03f76f50'); What does yeast produce during respiration? They are considered living when present inside living cell, but it is also considered as non living when present outside living organisms. Fermentation makes idli fluffy and dosa crispy, and change the flavour. unique curriculum that is the best fit for every student. MMS Full Form, What is the Full form of MMS? Answer: Pathogens enter our body through the air while breathing or through water that we drink or through the food that we eat or by direct contact with an infected person or may be carried through any carrier (any source that contains pathogens). (c) magnifying glass Answer: (c) antigen You will find round structures called root nodules on the roots. Answer: (b), II. 13. penicillin (a) Algae C: Wildlife includes all animals of reserve forests. The spread of diseases can be controlled by killing the mosquitoes. Question 2. So there is a chance that virus can transmit to his body and cause infection. 2. Revision notes in exam days is one of the best tips recommended by teachers during exam days. For example: Lung Cancer or liver damage. Protozoa are _______ in nature. 13. (a) We should keep a handkerchief on nose and mouth while sneezing or coughing because fine droplets carrying thousands of viruses or bacteria spread in the air. Classification of microorganisms (i) Bacteria Single-celled organisms Found in wide range of habitats ranging from glaciers to deserts and hot springs For example: curd bacteria (Lactobacillus) (ii) Fungi Main Previous Year papers, JEE (b) What will happen to the food if it is not refrigerated? Notes for class 11 Physics, Chemistry They can survive under all types of environmental conditions ranging from ice cold to hot springs and deserts to marshy lands. These microorganisms may survive exposure to such conditions for . These bacteria and blue green algae are called biological nitrogen fixer nitrogenous compounds and make it fertile. Answer: In this way vaccination helps in protecting the children from diseases. (f) The person who has hydrophobia often suffers from rabies. 10 ICSE, Revision (b) Lactobacillus is used to form curd from milk. online Quiz for class 10, Chapter wise To prevent ourselves from this kind of infection, we need to use a handkerchief and keep it on the nose and mouth while the infected person is coughing and sneezing. Still they are very useful for us. (c) We use cookies to ensure that we give you the best experience on our website. Ask questions by Voice or Image. Question 13. The knowledge of their existence came after the discovery of cells by Robert Hooke in 1665. Food is preserved from the attack of microorganisms by the following methods: Food preservatives like Sodium Benzoate are added to pickles, jams and squashes to prevent the growth of microorganisms. (ii) Microorganisms are used to produce alcohol at large scale on a commercial basis. Microorganisms: Friend and Foe Class 8 Notes Understanding the Lesson 1. They are produced from bacteria and fungi. Keep them in a warm place, away from sunlight. _______ are curved-shaped bacteria. Answer: Typhoid and Tuberculosis (TB) are the bacterial diseases. Class 8 Chapter 2 Science Extra Questions Question 11. . Curd contains a bacterium called Lactobacillus. False Microorganisms like bacteria and fungi cause food poisoning by producing toxic substances in the food. The spread of diseases can be controlled by killing the mosquitoes. smartech('create', 'ADGMOT35CHFLVDHBJNIG50K96924VTU0A9D6T0V8SJJV89KVC9EG'); (c) Do you think Seemas teacher decision was right? Exemplar for Math's, CBSE When a person sneezes or coughs, tiny droplets containing a number of disease-causing microorganisms come out of the mouth, and are released in the air. Rust of wheat, citrus canker and wilt, Question 15. For example: When any person suffering from cold sneezes, some of the droplets of moisture carrying many viruses are spread in air. Previous Years QuestionsNCERT solutions. Question 10. It can be called sun drying. Education, West Bengal For example - Penicillin Spirilum: This means that bacteria is in spiral shape. (c) We often hear our loved ones asking us to wash our hands thoroughly, definitely before having any meal, or when we come home from outside. Descubra as melhores solu es para a sua patologia com Homeopatia e Medicina Natural Outros Remdios Relacionados: what Is Microorganisms For Class 8; bacteria Definition For Class 8; what Is Microorganisms Class 8 Answers Also, they are characterized by numerous varieties, of different shapes and sizes. Microorganisms : Friend And Foe ncert solution for board exams and term 1 and term 2 exams. Can microorganisms be seen with the naked eye? 9. Edward Jenner. Prepare a short report. Microorganisms Microorganisms are classified into four major groups. Class 8 chapter 2. Name two single-celled microorganisms. Answer: Microorganisms like bacteria and fungi grow in the food and produce poisonous (toxic) substances in the food. What is the causative agent of malaria ? Fermentation is the process of conversion of food into alcohol. 15. curdling, III. Answer: Red algae is edible in certain countries. Microorganisms that causes disease are also kn For instance, when a fly sits on animal excreta or garbage, harmful disease-causing microbes stick to its legs. (d) microbes, Question 5. This stops microorganisms from growing as they cannot grow without water. Questions Physics, Important Who discovered the vaccine for small pox? Smallest bacteria has a size of 0.15 micron. Rhizobium, Question 16. Microorganisms Class 8 Science Chapter 2 as per NCERT Book used in CBSE and other Schools. questions, KVPY (b) yeast. The scientific study of microorganisms began with their observation under the microscope in the 1670s by Anton van Leeuwenhoek. Sample Papers Math's, CBSE to book questions have also been provided for the convenience of the students. Question 2. We can also say that the communicable diseases are those diseases which can be transferred from one person to another person. Biology Notes, Aptitude Tick the correct option: 1. (b) Air, water, food, carriers and physical contact. 12. Solutions For class 7, NCERT Quiz for Class 6 Math's, Online Previous year papers, Olympiad For fermentation of idli and dosa yeast or old batter is added. These are rod-like in shape and also known as rod shaped bacteria or bacilli. Answer in one word. Microorganisms : Friend And Foe - Additional Questions With Solutions: NCERT Book Solutions for class 8th. Q 2 -The host for malaria causing protozoan is: (a) anapheles mosquito. test for class 7 Math's, Online These microorganisms are very small and widely found. Spherical-shaped bacteria are called (a) fungi A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells.. These are classified as: 1. (d) What value of Rahuls mother is shown here? Solutions for class 9, NCERT Solutions Unscramble the jumbled words underlined in the following statements (a) microorganisms CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers, Admission and Entrance Exam Notification November 03, 2022. (d) vaccine, Question 12. All the microorganisms are harmful. Acidophiles grow best at a pH below 5.5. The same air is inhaled by another person sitting close by or in front of the infected person. 8. (b) Blue green algae fix directly from air to enhance fertility of soil. 10 Geography, History Class (a) The methods used for prevention of spoiling of food by the action of microbes is called food preservation. These bacteria and blue green algae are called biological nitrogen fixer nitrogenous compounds and make it fertile. Yeast is used for the production of alcohol and wine. This plasmid is helpful in reproduction. (b) (a) They cannot absorb nitrogen directly from the air. Microorganism Definition A microorganism is a living thing that is too small to be seen with the naked eye. They are transmitted to a healthy person while breathing. Anton van Leeuwenhoek discovered the microscope and microorganisms, more precisely microscopic bacteria. Mosquito nets should be used at night. 9. Previous year papers, BITSAT (d) Viruses Viruses though different from the above-mentioned living organisms are referred to as microbes. Notes Class 12, Zoology Mustard oil is popularly used for the preservation of pickles. (d) Amoeba, Question 3. What is fermentation? It means taking antibiotics to get rid of flu or any other viral infection is useless, because it does not re-duce the strength of the virus, nor does it reduce the duration of the infection. Answer: Rhizobium, Clostridium and Azotobacter. 7. Microorganisms as a friend:- They are useful to make curd from milk, to preparing idli and dosa. (d) algae, Question 15. Question 17. Requested URL: byjus.com/cbse-notes/cbse-class-8-science-notes-chapter-2-microorganisms/, User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.3 Mobile/15E148 Safari/604.1. Question 11. Answer: Question 14. They are produced from bacteria and fungi. Virus, Question 3. What is vaccination? Question 1. Answer: - 2. Class 11 Notes, Class The diseases that do not spread through sick to healthy person are called non communicable diseases. Simple, plant-like microorganisms are called Question 12. The living organisms that you fail to see with your eyes and which can be seen only with the microscope are called as micro-organisms. Material Biology, Name Yeast is a _______ fungus. Answer: Microorganisms are harmful in the following ways : Class 8 Science Chapter-wise Video Explanation, Class 8 English, History, Geography, and Civics MCQs, Class 8 Social Science Lesson Explanation, Class 8 Social Science Chapter-wise Video Explanations, CBSE Class 12 English Important Questions, CBSE Class 10 English Lessons Explanation, CBSE Class 10 English Important Questions, CBSE Class 10 Science Lessons Explanation, CBSE Class 10 Science Important Questions, CBSE Class 10 History Lessons Explanation, CBSE Class 10 Social Science Important Questions, CBSE Class 9 English Chapter-wise Video Explanation, CBSE Class 9 English Important Questions Videos, CBSE Class 9 Science Chapter-wise Video Explanation, CBSE Class 9 Hindi Chapter-wise Video Explanation, Class 7 English Chapter wise Video Explanation, List of Entrance Exams for Arts students after Graduation, Merchant Navy Entrance Exams and Admissions in India, and other Schools. What is decomposition? These can be seen only under the microscope. Sample papers, CBSE Answer: Microorganisms can be classified into the following groups based on their pH ranges: Neutrophiles grow best at a pH range of 5 to 8. smartech('identify', ''); Very small organisms around us which cannot be seen with naked eyes are called microorganisms. .. 2. Preservation by Sugar: Jams, Jellies and squashes are preserved by sugar. Whenever any harmful disease-causing microorganism enters the human body, the body produces substances to fight with the entered microbe. for class 7 Science, RS It is always suggested that not to eat anything from street hawkers. (b) telescope 14. Answer: Female Aedes mosquito carries the dengue virus from an infected person to a healthy person. True Some algae are sources of iodine and potash like brown algae. They make up almost 60% of the earth's living matter. MCQ, Important 8. How are carriers harmful to us? and John Avery, life is a member of the class of phenomena that are open or continuous systems able to decrease their internal entropy at the expense of substances or free energy taken in . She obeyed her teacher. Most bacteria act as decomposers (which means that they feed on dead and decaying organic matter) and release nutrients into soil, air etc. RPM Full Form, What is the Full form of RPM? 5. 4. The breeding places of mosquitoes like water in the coolers, tyres, flowerpots, etc. Salt is used as a food preservative. Now the question arises where do these microorganisms live? Fill in the Blanks The living organisms that you fail to see with your eyes and which can be seen only with the microscope are called as micro-organisms. Like if we take water and boils at very high temperature it cannot withstand with that high temperature and may lead to destruction of microorganism. 11 Chemistry Notes, Maths Microbiology is the science of study of microbes.
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