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Question 8:, , Write a short paragraph on the harms caused by microorganisms., , Answer:, , Harmful effects of microorganisms:, , Micro-organisms cause diseases in animals. For example, in humans,, bacteria cause diseases such as tuberculosis, cholera, typhoid, etc. In, cattle, the foot and mouth disease is caused by a virus. Also, several, microbes cause diseases in plants. For example, the productivity of, wheat, orange, apple, etc. is reduced due to microbial diseases in plants., , Certain microbes, on entering into our body, produce toxic substances., , This leads to food poisoning. Some micro-organisms such as fungus, spoil our food. For example, bread when left unused under moist, conditions gets spoiled by fungus, producing a white cotton-like growth, on the bread., , Question 9:, What are antibiotics? What precautions must be taken while taking, , antibiotics?, Answer:, , Antibiotics Are medicines produced by certain microorganisms to kill, other disease-causing microorganisms. These medicines are commonly, obtained from bacteria and fungi. Streptomycin, tetracycline, penicillin,, etc. are common antibiotics., , Precautions to be taken while using antibiotics:, , (i) Antibiotics should be taken under the supervision of a well qualified, doctor., , (ii) Course (intake) of antibiotics should be completed as per the, , prescription given by the doctor., , (iii) Antibiotics should be taken in the right amount and at the right time., , A wrann daca af antihintine makac tha driin inaffactiva Alen aveacciva