Some bacteria are used in research tools, etc. Fill in the Blanks Answer: Viruses are the most useful microbes. 9. 4. (b) Fungi Hyphae Louis Pasteur is known as father of microbiology for his discovery of vaccines for many diseases. Also called " microbes ", these organisms have a very basic biological organization: a significant proportion of them have only a single cell. eukaryote any cell or organism that possesses a clearly defined nucleus. Friendly Micro-organisms Application Videos. Thus, they help in curing the disease. In this way vaccination helps in protecting the children from diseases. NCERT Extra Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe will help to score more marks in your CBSE Board Exams. Salting is also used to preserve amla, raw mangoes and pickles. Answer: Cholera, tuberculosis, smallpox, hepatitis, etc. Question: What is fermentation? (a) rod-shaped Answer: 10. unicellular Question 1. (b) It is useful in production of wine, baking of bread, making idlis and dosas. Answer: Pathogens enter our body through any source and multiply inside the body cell and can result in disease. _______ are curved-shaped bacteria. Microorganisms include viruses and single-celled organisms like bacteria, yeast, protozoans and algae. (a) Explain various types of bacteria. Solutions, Entrance exam 7. In this way, malaria is transmitted to humans. 5) Answer: Microorganisms are present in all types of environments ranging from ice cold climate to hot springs, deserts and marshy lands. Whenever any harmful disease-causing microorganism enters the human body, the body produces substances to fight with the entered microbe. Many vaccines are prepared from microorganisms. For NEET, Questions class A protozoan called Plasmodium is responsible for malaria. These vaccines are given to children to protect them from diseases like tuberculosis, polio. (c) viruses (a) microscope True And when this fly sits on the food items, pathogens get transferred to them. Examples of microorganisms include bacteria, archaea, algae, protozoa, and microscopic animals such as the dust mite. (b) telescope Question 8. They are also found inside the bodies of animals including humans, air, water, soil, food and other things. 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. Answer: You will find round structures called root nodules on the roots. Question 6. 12. .. previous year Papers, Integer Question: What is vaccination? They can inhabit soil, water, and every other habit found on earth. Class 8 Chapter 2 Science Extra Questions Question 11. . The same air is inhaled by another person sitting close by or in front of the infected person. (i) They do not need to enter any host organism to reproduce or show any characteristics of life. (d) tricellular, Question 7. It treats & prevents diarrhea, helps in food breakdown and absorption of nutrients. Name some diseases caused by Protozoans. We should not eat food which is not fresh or not cooked properly. They appear to be likeplants, but they do not have leaves, roots, etc. Bacteria possess characteristics of living as well as non-living. Choose the correct option. For example - Penicillin These are as follows: Bacteria (singular: bacterium) Fit the balloon on the test tube and shake well. (b) animals They are all around us and are so small in size that they cannot be seen with bare human eyes. (c) Yes, because cough and cold spreads through air and there are chances that other students may also get infected. While taking antibiotics following precautions must be taken . Curd contains a bacterium, Lactobacillus. As we know that sometimes we do have infections like cough, sneezing, etc. 2.Rhizobium bacteria present in the roots of pulse plants fixes nitrogen from the air and supplies nitrogen compounds to the pulse plants. Biology Notes, Chapter Curd contains a bacterium called Lactobacillus. They appear to be plants, but they do not have leaves, roots, etc. Main Previous Year papers, JEE Question 11. (a) Curbossulite is an air-borne disease caused by a bacterium. Microorganism may be unicellular or multicellular. There are five major groups of micro-organisms. 2. 3. What is its effect? Sharma solutions, NTSE Ans: A microorganism is a microscopic living organism, which may be single-celled or multicellular. Agarwal's solutions, RD Microorganisms are classified into four groups, bacteria, fungi, protozoa and algae. 15. smartech('identify', ''); Very small organisms around us which cannot be seen with naked eyes are called microorganisms. Microorganisms are harmful in the following ways : Microorganisms cause diseases like typhoid, cholera and tuberculosis in human beings. Answer: Why? Simple, plant-like microorganisms are called Draw a diagram of the root and show the root nodules. Carriers of pathogens also help in their transmission. Answer: Therefore, we can say that vaccines are helpful to keep us healthy and protect us from infections. Heat and Cold Treatment: Milk is boiled to kill the bacteria. Answer: Thus, this chapter will help, to an extent, in clearing this matter. They are living things that are too tiny to see with the naked eye. Topics covered are Introduction to Micro-organisms and microbiology, different types of Micro-organisms, Useful and Harmful Micro-organisms. 8. Fungus that grows on the bread can be seen with a magnifying glass. _______ are the threads of the multicellular fungi. & Reasoning, Class (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. microorganism: [noun] an organism (such as a bacterium or protozoan) of microscopic or ultramicroscopic size. .. 5. These bacteria and blue green algae are called biological nitrogen fixer nitrogenous compounds and make it fertile. should be drained out. Yeast is used for the production of alcohol and wine. . Lactobacillus is used to form curd from milk. Write the names of any two antibiotics. Tick the correct option: 1. It is a process of heating food item to high temperature and then quickly cooling it. 1. Microorganisms can survive under all types of environment. 10 Math's Notes, Class How does it help in protecting children from diseases? Entrance exam, JEE Answer: Answer: They cannot absorb nitrogen directly from the air. Female Aedes mosquito carries the dengue virus from an infected person to a healthy person. State whether the given statements are true or false. Name two single-celled microorganisms. Which of the following is not a fungi: i) Bread Mould ii) Penicillium 3. Microbe involved in curd formation: i) Amoeba ii) Lactobacillus 2. (a) bacilli They can live and thrive in extreme environments including deep-sea volcanoes, clouds, polar ice caps, hot water springs and human intestines. Can you tell why the curd did not set? smartech('create', 'ADGMOT35CHFLVDHBJNIG50K96924VTU0A9D6T0V8SJJV89KVC9EG'); Also, they are characterized by numerous varieties, of different shapes and sizes. Refresh the page or contact the site owner to request access. Resourses, Sample papers for Lactobacillus is a friendly-bacterium. Copyright 2022 Physics Wallah Pvt. Sun Drying: This is a traditional method of food preservation. for Math's, Worksheet MCQ Questions for Class 8 Science Microorganisms: Friend and Foe. Theory & Notes, Math's Microorganisms : Friend And Foe ncert solution for board exams and term 1 and term 2 exams. Singh Chemistry Solutions, NCERT Answer: An instrument called microscope is required to see the microorganisms. Advance previous year papers, NEET 3. 6. Or we can say that water is microorganism free. Class 8 Science Microorganisms Chapter 2 (3/5) Useful Microorganisms Explanation in Hindi, Imp Questions and Answers. Name a disease caused by food poisoning. She obeyed her teacher. These are the Microorganisms class 8 Notes prepared by team of expert teachers. Medical Exam, Olympiads The size of bacteria ranges from 0.2 micron to 100 microns. Mustard oil is popularly used for the preservation of pickles. Protozoa are _______ in nature. Education, Karnataka Examination We almost always presume they are harmful to us. Answer: These bacteria and blue green algae are called biological nitrogen fixers. What role does sugar play in the preservation of food? (a) antibiotic. Question 2. Class 8; Class 9; Class 10; Class 11 Science; Class 11 Commerce; Class 12 Science; Class 12 Commerce; Class 12 humanities; ICSE. How to avoid the spreading of Microorganisms has been discussed. Cocci: This means that bacteria is circular or spherical in shape. Spirilum: This means that bacteria is in spiral shape. Nitrogen is needed by the plants for their growth. Answer: They are also called germs. (b) beverage 15. The Netherlands (Dutch: Nederland [nedrlnt] ()), informally Holland, is a country located in Northwestern Europe with overseas territories in the Caribbean.It is the largest of four constituent countries of the Kingdom of the Netherlands. What are antibiotics? Name two typical habitats of micro-organisms Answer: Commonly found everywhere - in the air, in water, inside the bodies of living organisms. Class 8 Chapter 2 Science Extra Questions Question 11. . They, however, reproduce only inside the cells of the host organism, which may be a bacterium, plant or animal. True (c) Protozoa Paramecium, Amoeba. 4. Antibiotics are the medicines (drugs) that kill or stop the growth of disease causing microorganisms in our body. False Solutions for class 11, NCERT (b) Xanrhat is a dangerous bacterial disease. (d) cocci, Question 9. Plasmodium is present in the saliva of female mosquito. 8 Math Notes, Class 8 Microorganisms like bacteria and fungi grow in the food and produce poisonous (toxic) substances in the food. Most of street hawkers sells food items in an open area which always get contaminated with the dust and flies carrying germs with them. Requested URL: byjus.com/biology/microbes/, User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Mobile/15E148 Safari/604.1. Penicillin, Streptomycin, Tetracycline and Erythromycin are some antibiotics. The Plasmodium, here, multiplies itself and reaches the salivary gland of the mosquito. Microorganisms are classified into four major groups namely bacteria, fungi, protozoa and some algae. How does it help in protecting children from diseases? 2. algae, fungus They are mostly single- celled tiny organisms, but they live together in colonies of millions. 2. The role of sugar in food preservation is significant. They are used for curdling of milk, preparation of bread, cake, etc. They consist of nucleic acid covered with protein shell. To see the microorganisms like bacteria and protozoa, we use a microscope. Project: Requirements 2 test tubes, marker pen, sugar, yeast powder, 2 balloons and lime water. Bacteria are classified on the basis of their shapes into the following categories: Question 1. What does yeast produce during respiration? 15. curdling, III. (d) spiral, Question 8. (i) 8. Write the name of a bacterium that helps in the formation of curd. They cause several diseases in human beings, animals, and plants which can even lead to death. Female Aedes mosquito carries the dengue virus from an infected person to a healthy person. Conditions that promote Microorganisms and Preservation of Food have been explained too. The revision notes help you revise the whole chapter 2 in minutes. MCQ, Important Food Preservation 3. Question 1. Red algae is edible in certain countries. The reason behind it is, viruses do not have a cellular structure, i.e they lack cytoplasm and other cell . State Board, Telangana Board of Watch the setup every day for next 3-4 days. 6. What is pasteurisation? Explain canning. Join Teachoo Black This is called food poisoning. (a) Algae 1. algae Microorganisms : Friend And Foe - Additional Questions With Solutions: NCERT Book Solutions for class 8th. Add a spoonful of yeast in test tube B, Inflate the two balloons incompletely. Answer: It is the study of microorganisms. The study of microorganisms is known as microbiology . B: Wildlife includes all vertebrates of reserve forests. They are heterotrophic, which means they are dependant on another animal for their food. The course prescribed by the doctor should be finished in proper doses. Microorganisms are very useful to us. Question 2. Edward Jenner. Answer: Who discovered the vaccine for small pox? questions, KVPY Observe its roots. Algae is green in color and can make food by the process of photosynthesis. 2. Question 3. 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. The storing of food products at the temperature of 0C to 5C is known as refrigeration. Class 8 Science quiz, Chapter wise The Netherlands consists of twelve provinces; it borders Germany to the east, Belgium to the south, with a North Sea coastline to the north and west. Answer: Keep the person belongings of the patient away from those of the other. We need a microscope to see microbes. The term 'microorganisms' include bacteria, fungi, viruses and protozoa. Bacteria help in treating sewage and producing biogas from waste. (b) Air, water, food, carriers and physical contact. smartech('register', '6ff79e6140cd0fd5d1c68cbc03f76f50'); What do you mean by immunity? Answer: Match the following The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India. But why is that so? D: Thyroxine- this hormone regulates metabolism of an organism and is involved in the process of metamorphosis showing developmental changes in the life span of an organism. Answer: Microorganisms are so small that we cannot see them with the naked eye. Answer: Microorganisms like bacteria and fungi grow in the food and produce poisonous (toxic) substances in the food. online Quiz for class 10, Chapter wise Wallah, Class-6 Microorganisms: Friend and Foe Class 8 Notes Understanding the Lesson 1. Vibrio Question: Write a short paragraph on the harms caused by microorganisms. 4. Answer: i. Microorganisms are found everywhere and there is no plant or animal that doesn't harbor some type of microorganism.
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