8th Class Science Microorganisms : Friend and Foe Question Bank

done Microorganisms Total Questions - 40

• question_answer1)
  Which of the following is the smallest microorganism?
  A)
   Algae                           done clear
  B)
                          Bacterium                     done clear
  C)
                          Protozoan                     done clear
  D)
                          Virus done clear
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• question_answer2)
  Identify W, X and Y?
  A)

  (W)	(X)	(Y)
  Virus	Protozoan	Fungus

                  done clear
  B)
                        

  (W)	(X)	(Y)
  Algae	Bacterium	Virus

                  done clear
  C)
                        

  (W)	(X)	(Y)
  Virus	Fungus	Protozoan

        done clear
  D)
                        

  (W)	(X)	(Y)
  Fungus	Algae	Bacterium

  done clear
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• question_answer3)
  Identify bacteriophage.
  A)
   Algae                           done clear
  B)
                          Virus                done clear
  C)
                          Protozoa                       done clear
  D)
                          Fungi done clear
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• question_answer4)
  Which of the following statements describes bacteriophage correctly?
  A)
   It is a bacterium which causes diseases in plants. done clear
  B)
                          It is a type of virus which attacks bacteria. done clear
  C)
                          It is a bacterium which kills viruses. done clear
  D)
                          It can multiply inside both living and non-living cells. done clear
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• question_answer5)
  Fungi reproduces by
  A)
   Fission                          done clear
  B)
                          Fusion              done clear
  C)
                           Seed formation             done clear
  D)
                          Spore formation done clear
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• question_answer6)
  Which of the following characteristics places algae in the group of autotroph?
  A)
   Carrying out anaerobic respiration done clear
  B)
                          Manufacturing their own food done clear
  C)
                          Feeding on dead organisms done clear
  D)
                          Feeding on other living organisms done clear
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• question_answer7)
  The moist bread becomes mouldy after a few days when it is left in a container with a cover. Which of the following conditions favour the growth of the fungus?
  A)
   Absence of light done clear
  B)
                          Absence of water done clear
  C)
                          Presence of sunlight done clear
  D)
                          Presence of carbon dioxide done clear
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• question_answer8)
  Which of the following microorganisms play an important role in maintaining the balance of nitrogen gas in the atmosphere?
  A)
   Viruses                         done clear
  B)
                          Bacteria                        done clear
  C)
                          Algae                           done clear
  D)
                          Protozoa done clear
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• question_answer9)
  What causes the dough to rise when yeast is added to it?
  A)
   An increase in temperature done clear
  B)
                          An increase in the amount of substance done clear
  C)
                          An increase in the amount of released water by yeast cells done clear
  D)
                          The release of carbon dioxide gas done clear
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• question_answer10)
  What process takes place when yeast is added to grape juice and left for a week?
  A)
   Decomposition   done clear
  B)
                         Fermentation                 done clear
  C)
                          Distillation         done clear
  D)
                          Oxidation done clear
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• question_answer11)
  Which of the following enzymes is secreted by bacteria that can digest cellulose?
  A)
   Amylase                       done clear
  B)
                          Cellulase                       done clear
  C)
                          Lipase                          done clear
  D)
                          Protease done clear
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• question_answer12)
  Which of the following is/are the functions performed by the microorganisms in the field of biotechnology?
  A)
   The production of bioplastic done clear
  B)
         The production of hormones done clear
  C)
         Gene therapy done clear
  D)
         Both (B) and (C) done clear
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• question_answer13)
  Which of the following is/are produced by using bacteria?
  A)
   Antibiotics                     done clear
  B)
         Cheese done clear
  C)
         Yoghurt                        done clear
  D)
         All of these                    done clear
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• question_answer14)
  Which of the following terms is given to the microorganisms that cause diseases?
  A)
   Antigens                       done clear
  B)
         Antibodies                     done clear
  C)
         Pathogens                     done clear
  D)
         Vectors done clear
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• question_answer15)
  Which of the following disease causing pathogens is / are carried by mosquitoes?
  A)
   Dengue fever done clear
  B)
         Malaria done clear
  C)
         Cholera done clear
  D)
         Both (A) and (B) done clear
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• question_answer16)
  Identify the disease that is caused by protozoa.
  A)
   Cholera                        done clear
  B)
         Malaria             done clear
  C)
         Jaundice                       done clear
  D)
         Hepatitis B                    done clear
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• question_answer17)
  Which of the following options is/are true about the diseases, microorganisms which cause them and the symptoms of the diseases?
  A)
   Malaria, Protozoan, Fever and Chills done clear
  B)
         Hepatitis B, Virus, Swollen liver done clear
  C)
         Cholera, Virus, Vomiting, diarrhea done clear
  D)
         Both (A) and (B) done clear
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• question_answer18)
  Which of the following can affectively prevent the ringworm disease?
  A)
   Vaccination done clear
  B)
         Vector control done clear
  C)
         Improving personal hygiene done clear
  D)
         Using antibiotics done clear
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• question_answer19)
  Which of the following bacteria lives symbiotically in pea plants?
  A)
   Rhizobium                     done clear
  B)
         Nitrosomonas    done clear
  C)
                     Azotobacter                   done clear
  D)
         Clostridium done clear
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• question_answer20)
  Which of the following bacteria causes Cholera?
  A)
   Streptococcus    done clear
  B)
         Clostridium                   done clear
  C)
         Pasteurella                    done clear
  D)
         Vibrio   done clear
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• question_answer21)
  Which of the following food components is digested by bacteria living in the intestines of herbivorous animals?
  A)
   Cellulose                       done clear
  B)
         Proteins                        done clear
  C)
         Fats                             done clear
  D)
         Vitamins done clear
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• question_answer22)
  Which of the following fungi have given one of the greatest drugs to the world of medicine?
  A)
   Penicillium notatum done clear
  B)
         Ustilago maydis done clear
  C)
         Colletorichum falcatum done clear
  D)
         Alternaria solani done clear
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• question_answer23)
  Which one of the following is called pond silk?
  A)
    Spirogyra done clear
  B)
         Volvox done clear
  C)
         Chlamydomonas done clear
  D)
         Euglena done clear
  View Solution play_arrow

• question_answer24)
  Which of the following is the characteristic feature that distinguishes an algae from fungi?
  A)
   Heterotrophic    done clear
  B)
         Autotrophic                   done clear
  C)
         Parasitic                       done clear
  D)
         Sporophytic                  done clear
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• question_answer25)
  How does Entamoeba histolytica enter the human body?
  A)
   Through a mosquito bite done clear
  B)
         Through Bird droppings done clear
  C)
         Through Contaminated food and water done clear
  D)
         Through a Sweat done clear
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• question_answer26)
  Which of the following microorganisms causes common cold?
  A)
   Bacteria                        done clear
  B)
         Virus                done clear
  C)
         Protozoa                       done clear
  D)
         Algae done clear
  View Solution play_arrow

• question_answer27)
  Which of the following statements is true for viruses?
  A)
   Viruses multiply only in living host. done clear
  B)
         Their crystals have a definite shape. done clear
  C)
         Viruses grow and multiply by themselves outside the host. done clear
  D)
         Viruses may be crystallized. done clear
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• question_answer28)
  How are microorganisms useful to us?
  A)
   The production of chemical fertilizers done clear
  B)
         The production of fireworks done clear
  C)
         The production of soft drinks done clear
  D)
         The production of antibiotics done clear
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• question_answer29)
  A microorganism X is used in the making of bread. It is also used in making which of the following substances?
  A)
   Cheese                         done clear
  B)
         Vinegar             done clear
  C)
         Wine                            done clear
  D)
         Yoghurt                        done clear
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• question_answer30)
  Through which of the following modes do most of the infectious diseases spread?
  A)
   Body contact    done clear
  B)
         Air                               done clear
  C)
         A vector                       done clear
  D)
         All of these done clear
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• question_answer31)
  Which of the following is represented by 'X' in the figure given below?
  A)
   Protozoa                       done clear
  B)
         Bacteria                        done clear
  C)
         Viruses                         done clear
  D)
         Algae done clear
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• question_answer32)
  Which of the following is the largest bacteria?
  A)
   Bacillus                        done clear
  B)
         Coccus             done clear
  C)
         Spirillum                       done clear
  D)
         Spherical                      done clear
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• question_answer33)
  Which of the following substances is/are produced by an organism to prevent or reduce the spread of microorganisms?
  A)
   Antiseptics                    done clear
  B)
         Antibiotics                     done clear
  C)
         Antibodies                     done clear
  D)
         All of these        done clear
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• question_answer34)
  Which of the following organisms have an ability to help in recycling of nutrients and energy?
  A)
   Bacteria                        done clear
  B)
         Diatoms            done clear
  C)
         Virus                            done clear
  D)
         Fungi                done clear
  View Solution play_arrow

• question_answer35)
  What helps in diffentiating 'Spirogyra' from 'paramoecium'?
  A)
   Mitochondria     done clear
  B)
         Golgi bodies                  done clear
  C)
         Nucleus                        done clear
  D)
         Plastids done clear
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• question_answer36)
  Which of the following organisms can perform photosynthesis?
  A)
   Euglena                        done clear
  B)
         Paramecium      done clear
  C)
         Mucor                          done clear
  D)
         Mushroom        done clear
  View Solution play_arrow

• question_answer37)
  Which of the following microorganisms are used in making antibiotics?
  A)
   Viruses                         done clear
  B)
         Fungi                done clear
  C)
         Bacteria                        done clear
  D)
         Both  and                     done clear
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• question_answer38)
  Observe the given figure and identify P, Q, R and S.
  A)
   P-Coccus, Q-Bacillus, R-Vibrio, S-Spirillum done clear
  B)
         P-Bacillus, Q-Coccus, R-Spirillum, S-Vibrio done clear
  C)
         P-Bacillus, Q-Vibrio, R-Coccus, S-Spirillum done clear
  D)
         P-Bacillus, Q-Spirillum, R-Vibrio, S-Coccus done clear
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• question_answer39)
  Which of the following pair is correct?                
  A)

  Pathogens	Diseases caused
  Viruses	Dengue fever

        done clear
  B)
       

  Pathogens	Diseases caused
  Bacteria	Malaria

        done clear
  C)
       

  Pathogens	Diseases caused
  Fungi	Hepatitis

        done clear
  D)
       

  Pathogens	Diseases caused
  Protozoa	Syphilis

  done clear
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• question_answer40)
  Which of the following microorganisms exhibit symbiotic life?
  A)
   Lichens done clear
  B)
         Volvox done clear
  C)
         Blue green algae done clear
  D)
        Spirogyra done clear
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