Microorganism Assignment 2 - Class VIII - Delhi Public School PDF
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Delhi Public School
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This document is an assignment on microorganisms from a class 8 science course at the Delhi Public School. It includes questions on various aspects of microorganisms and their roles, such as the smallest microorganism, mode of transmission of diseases, and the methods of killing pathogenic microorganisms. It also includes questions on the role of organisms in various natural processes.
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DELHI PUBLIC SCHOOL- BOPAL, AHMEDABAD CLASS: VIII ASSIGNMENT-2 MICROORGANISMS: FRIENDS AND FOE Competitive Edge: 1. Which of the following is the smallest microorganism? (a) Bacteria (b) Virus (c) Amoeba...
DELHI PUBLIC SCHOOL- BOPAL, AHMEDABAD CLASS: VIII ASSIGNMENT-2 MICROORGANISMS: FRIENDS AND FOE Competitive Edge: 1. Which of the following is the smallest microorganism? (a) Bacteria (b) Virus (c) Amoeba (d) Fungus 2. Study the following table and select the correct option for P, Q, R and S. Disease Causative organism Mode of transmission Chicken-pox Virus P Q Bacterium Water/Food Malaria R Mosquito S Virus Water (a) P-Air/contact; Q-Cholera; R-Protozoan; S-Hepatitis B (b) P-Mosquito; Q-Measles; R-Fungi; S-Polio (c) P-Water; 0-Polio; R-Protozoan; S-Hepatitis B (d) P-Air; Q-Typhoid; R-Fungi; S-Measles 3. Pathogenic micro-organisms present in host cells are killed by medicines called (a) Pain killer (b) Antibodies (c) Antibiotics (d) Vaccines 4. Which cannot fix atmospheric nitrogen in the soil? (a) Rhizobium (b) Clostridium (c) Azotobacter (d) Penicillin 5. The status of algae in the aquatic food chain is (a) Consumers (b) Producers (c) Host (d) Small in size 6. The disease caused by a protozoan and spread by an insect is (a) Dengue (b) Malaria (c) Polio (d) Measles 7. Paheli dug two pits, A and B, in her garden. In pit A, she put a polythene bag packet with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She, then covered both the pits with soil. What did she observe after a month? (a) Waste in pit A degraded faster than that in pit B (b) Waste in pit B degraded faster than that in pit A (c) Waste in both pits degraded almost equally (d) Waste in both pits did not degrade at all 8. The algae commonly used as a fertilizer are (a) Staphylococcus (b) Diatoms (c) Blue-green algae (d) None of these 9. Which process release nitrogen gas back into the atmosphere? (a) Nitrification (b) Denitrification (c) Decay (d) Assimilation 10. Match different organisms in column I with their related characteristics in column II and select the correct option from the codes given below. Column I Column II (a) Entamoeba (i) A brown alga which is a rich source of iodine histolytica (b) Bacteriophage (ii) A protozoan that causes disease in human beings by living in the large intestine of humans (c) Penicillium (iii) A virus which infects a bacterial cell. (d) Fucus (iv) A fungus used to obtain antibiotic. (a) (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) (b) (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i) (c) (a) - (ii), (b) - (i), (c) - (iii), (d) - (iv) (d) (a) - (iv), (b) - (ii), (c) - (i), (d) - (iii) ANSWER KEY 1(b) 2 (a) 3 (c) 4 (d) 5 (b) 6 (b) 7 (b) 8 (c) 9 (b) 10 (a)
