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8th class science chapter 2 summary NCERTIn sort please help me |
| Answer» <html><body><p>tion:Microorganisms are too small and are not visible with the naked eye.They can live in all kinds of environment, ranging from ice cold climate to hot springs, <a href="https://interviewquestions.tuteehub.com/tag/deserts-437656" style="font-weight:bold;" target="_blank" title="Click to know more about DESERTS">DESERTS</a> and marshy lands.Microorganisms are found in air, water and in the bodies of plants and animals.They may be unicellular or multicellular.Microorganisms include bacteria, fungi, protozoa and some algae. Viruses though different from the above-mentioned living organisms are referred to as microbes.Viruses are quite different from other microorganisms. They reproduce only inside the cells of the host organism: bacterium, plant or animal.Friendly MicroorganismsThe bacterium, Lactobacillus converts milk into curd. Bacteria are also <a href="https://interviewquestions.tuteehub.com/tag/involved-7257329" style="font-weight:bold;" target="_blank" title="Click to know more about INVOLVED">INVOLVED</a> in the making of cheese, pickles and many other food items. Acetobacter aceti bacteria is used for the production of acetic acid from <a href="https://interviewquestions.tuteehub.com/tag/alcohol-853024" style="font-weight:bold;" target="_blank" title="Click to know more about ALCOHOL">ALCOHOL</a>.Yeast is used for commercial production of alcohol and wine by growing them on natural sugars present in grains like barley, wheat, rice and crushed fruit juices etc.Antibiotics are manufactured by growing specific microorganisms and are used to cure a variety of diseases.Some microorganisms <a href="https://interviewquestions.tuteehub.com/tag/reside-613914" style="font-weight:bold;" target="_blank" title="Click to know more about RESIDE">RESIDE</a> in the root nodules of leguminous plants. They can fix atmospheric nitrogen from the air into the soil and increase soil fertility.Specialized bacteria convert nitrates and nitrites present in the soil into nitrogen gas which is released in the atmosphere.Some microorganisms decompose organic <a href="https://interviewquestions.tuteehub.com/tag/wastes-1449268" style="font-weight:bold;" target="_blank" title="Click to know more about WASTES">WASTES</a> like dead plants and animals into simple substances and clean up the environment.Harmful MicroorganismsThe bacterium, Lactobacillus converts milk into curd.Disease-causing microorganisms are called pathogens. Common ailments like cold, influenza (flu) and most coughs are caused by viruses. Serious diseases like polio and chicken pox are also caused by viruses. Diseases like dysentery and malaria are caused by protozoans.Typhoid and tuberculosis (TB) are caused due to bacteria.Some common diseases, their modes of transmission and preventive measures are given below.Some Common Human Diseases Caused by MicroorganismsMicroorganisms Friend and Foe Class 8 Notes Science Chapter 2 1</p></body></html> | |