1. Tick the correct option:
1. The yeast multiply by a process called (a) Binary fission (b) Budding (c) Spore formation (d) None of the above 2. The example of protozoan is (a) Penicillium (b) Blue green algae (c) Amoeba (d) Bacillus 3. The most common carrier of communicable diseases is (a) Ant (b) Housefly (c) Dragonfly (d) Spider 4. The following is an antibiotics (a) Alcohol (b) Yeast (c) Sodium bicarbonate (d) Streptomycin 5. Yeast produces alcohol and carbon dioxide by a process called (a) Evaporation (b) Respiration (c) Fermentation (d) Digestion 6. The algae commonly used as fertilizers are called (a) Staphylococcus (b) Diatoms (c) Blue green algae (d) None of the above 7. Cholera is caused by (a) Bacteria (b) Virus (c) Protozoa (d) Fungi 8. Plant disease citrus canker is caused by (a) Virus (b) Fungi (c) Bacteria (d) None of these 9. The bread dough rises because of (a) Kneading (b) Heat (c) Grinding (d) Growth of yeast cells 10. Carrier of dengue virus is (a) House fly (b) Dragon fly (c) Female Aedes Mosquito (d) Butterfly 11. Yeast is used in the production of (a) Sugar (b) Alcohol (c) Hydrochloric acid (d) Oxygen 12. The vaccine for smallpox was discovered by (a) Robert Koch (b) Alexander Fleming (c) Sir Ronald Ross (d) Edward Jenner 13. Chickenpox is caused by (a) Virus (b) Fungi (c) Protozoa (d) Bacteria 14. The bacterium which promote the formation of curd (a) Rhizobium (b) Spirogyra (c) Bread mould (d) Lactobacillus 15.Plasmodium is a human parasite which causes (a) dysentery (b) Sleeping sickness (c) Malaria (d) All of the above 16. The bacterium Bacillus Anthracis was discovered by (a) Edward Jenner (b) Alexander Fleming (c) Louis Pasteur (d) Robert Koch 17. Carrier of malaria causing protozoan is (a) Butterfly (b) Housefly (c) Female Anopheles Mosquito (d) Cockroach 18. The process of conversion of sugar into alcohol is called (a) Infection (b) Moulding (c) Nitrogen fixation (d) Fermentation 19. Foot and mouth disease of cattle is caused by (a) Fungi (b) Virus (c) Algae (d) None of these 20. Which of the following is not a fungi (a) Paramecium (b) Bread mould (c) Penicillium (d) Aspergillus Answers: 1)b 2) c 3) b 4) d 5) c 6) c 7) a 8) c 9) d 10) c 11) b 12) d 13) a 14) d 15) c 16) d 17) c 18) d 19) b 20) a 2. Write the contributions of the following: A. Louis Pasteur B. Edward Jenner C. Alexander Fleming D. Robert Koch 3. Define: A. Microbes B. Pathogens C. Nitrogen Fixation D. Pasteurization E. Preservatives F. Carriers G. Fermentation 4. Give two uses of microorganisms in the following areas: i) Food Industry ii) Medicinal Use iii) Environment related 5. Give an activity to show the process of fermentation? 6. List few differences between Antibiotics and Antibodies? 7. Explain Nitrogen Cycle in detail with the help of a cyclic representation? 8. List some harmful effects of microorganism? 9. How can we control the spread of diseases caused by mosquitoes? 10. Why milk in polypacks does not get spoiled? 11.Why does sugar solution with yeast powder become alcoholic in taste? 12. Megha, a class VIII student was asked to submit a project report on mosquito transmitted diseases. She visited a nearby hospital where her aunt was staffed as a nurse. Her aunt took her to a patient suffering from malaria. Megha talked to the patient and asked him about his health and also took some flowers for him. (a) Name the mosquito that spreads malaria. (b) What is the name given to such organisms that transmit the diseases from infected to healthy persons? (c) How can we control the spread of diseases by mosquitoes? (d) Identify two important values as shown by Megha. 13. Kushal's family is happy as he became a proud father to a baby girl. Upon a routine visit to the hospital, the doctor advised him not to skip the vaccination schedule. While discussing the same at home, one of the family members suggested that vaccination is not necessary for a girl child. Kushal opposed this suggestion. (a) What is vaccination? (b) Name the scientist who prepared the first vaccine? (c) Critically comment upon Kushal's viewpoint. III Microorganisms-Friend and Foe Solved Questions Read Download CBSE 8th science: "Notes ands Questions Answers" Read Download You might also like: Chapter: VIII Microorganisms-Friend and Foe Microorganisms : Solved Questions Read Download Microorganisms- : Notes Read Download Microorganisms- : MCQ 's Read Download Microorganisms- : Test Paper-1 Read Download Microorganisms- : Test Paper -2 Read Download
22 Comments
j.sunil
15/7/2012 01:50:35 am
Chapter: VIII Microorganisms-Friend and Foe
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28/7/2012 05:01:43 am
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28/7/2012 06:48:05 am
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Aneesha
11/4/2014 12:40:04 pm
Y don't u give a written test
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meghana
22/6/2014 04:31:04 am
nice
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KANGANA RANAUT
28/12/2014 02:16:44 am
too simple
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ATRIJA GHOSH
28/12/2014 02:18:31 am
MORE SCIENTIFIC ANSWERS REQUIRED
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Tirth Gandhi
1/9/2014 10:11:59 am
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Tirth Gandhi
1/9/2014 10:13:31 am
can u tell the answers of 12 and 13 questions
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12. Megha, a class VIII student was asked to submit a project report on mosquito transmitted diseases. She visited a nearby hospital where her aunt was staffed as a nurse. Her aunt took her to a patient suffering from malaria. Megha talked to the patient and asked him about his health and also took some flowers for him.
medha sharma
5/6/2015 07:30:15 am
too easy
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gvgfdx
25/9/2015 06:30:19 pm
what about 13 (C)
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s
11/10/2015 11:10:33 am
very useful
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Cheryl
21/7/2016 06:31:53 pm
Can you tell the answer of 6 and 8 questions
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Cheryl
21/7/2016 06:36:37 pm
Can u tell the answer of 6 and 8 questions
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Unmesh
6/11/2016 11:36:07 am
very boring
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Moksh kalra
3/2/2018 08:02:20 pm
Useful
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