Extra 40 multiple-choice questions (MCQs) with answers from the chapter:2 "Microorganisms: Friend and Foe" for Class 8 Science (CBSE):-
Which of the following is not a microorganism?
a) Bacteria
b) Fungi
c) Virus
d) Earthworm
Ans:
d) Earthworm
Which of the following microorganisms is used in the production of alcohol?
a) Bacteria
b) Virus
c) Yeast
d) Algae
Ans:
c) Yeast
Which of these microorganisms can live in extreme conditions like hot springs and deep oceans?
a) Fungi
b) Bacteria
c) Algae
d) Protozoa
Ans:
b) Bacteria
Which group of microorganisms does bread
mold
belong to?
a) Bacteria
b) Fungi
c) Virus
d) Protozoa
Ans:
b) Fungi
Which microorganism is used in the production of antibiotics?
a) Virus
b) Fungi
c) Algae
d) Protozoa
Ans:
b) Fungi
Which of these diseases is caused by bacteria?
a) Malaria
b) Tuberculosis
c) AIDS
d) Influenza
Ans:
b) Tuberculosis
Which of the following is an example of a viral disease?
a) Typhoid
b) Cholera
c) Influenza
d) Tuberculosis
Ans:
c) Influenza
Which microorganism helps in nitrogen fixation in the soil?
a) Lactobacillus
b) Rhizobium
c) Yeast
d) Amoeba
Ans:
b) Rhizobium
Which microorganism is used in making curd?
a) Rhizobium
b) Yeast
c) Lactobacillus
d) Penicillium
Ans:
c) Lactobacillus
Which microorganism is responsible for causing malaria?
a) Plasmodium
b) Salmonella
c) Vibrio cholerae
d) Penicillium
Ans:
a) Plasmodium
Which microorganism is used in making antibiotics?
a) Penicillium
b) Rhizobium
c) Lactobacillus
d) Plasmodium
Ans:
a) Penicillium
Which of the following is not a bacterial disease?
a) Tuberculosis
b) Cholera
c) Polio
d) Typhoid
Ans:
c) Polio
Which microorganism is used in the fermentation of sugar to produce alcohol?
a) Virus
b) Bacteria
c) Yeast
d) Protozoa
Ans:
c) Yeast
Which microorganism is used in the production of antibiotics like penicillin?
a) Fungi
b) Bacteria
c) Algae
d) Protozoa
Ans:
a) Fungi
Which of these is not caused by a virus?
a) Dengue
b) Chickenpox
c) Malaria
d) Common cold
Ans:
c) Malaria
Bacteria that convert atmospheric nitrogen into a usable form are called:
a) Pathogenic bacteria
b) Nitrogen-fixing bacteria
c) Antibiotic bacteria
d) None of these
Ans:
b) Nitrogen-fixing bacteria
Which microorganism is used in making bread and cakes fluffy?
a) Yeast
b) Amoeba
c) Fungi
d) Virus
Ans:
a) Yeast
Which of the following is used in the preservation of pickles?
a) Vinegar
b) Yeast
c) Bacteria
d) Fungi
Ans:
a) Vinegar
Which of the following microorganisms causes food poisoning?
a) Salmonella
b) Rhizobium
c) Penicillium
d) Lactobacillus
Ans:
a) Salmonella
Which microorganism helps in making antibiotics?
a) Virus
b) Fungi
c) Amoeba
d) Algae
Ans:
b) Fungi
Which of these is caused by a virus?
a) Tuberculosis
b) Typhoid
c) Polio
d) Cholera
Ans:
c) Polio
Which disease is spread by contaminated water?
a) Cholera
b) Tuberculosis
c) Malaria
d) Dengue
Ans:
a) Cholera
Which microorganism causes typhoid?
a) Salmonella
b) Plasmodium
c) Rhizobium
d) Penicillium
Ans:
a) Salmonella
Which disease is caused by Plasmodium?
a) Typhoid
b) Malaria
c) Cholera
d) Tuberculosis
Ans:
b) Malaria
Which virus causes AIDS?
a) HIV
b) H1N1
c) Polio
d) Influenza
Ans:
a) HIV
Which microorganism causes tuberculosis?
a) Mycobacterium tuberculosis
b) Plasmodium
c) Vibrio cholerae
d) Salmonella
Ans:
a) Mycobacterium tuberculosis
Which of these is an example of a fungal disease?
a) Athlete’s foot
b) Malaria
c) Tuberculosis
d) Cholera
Ans:
a) Athlete’s foot
Which microorganism is used in making vaccines?
a) Virus
b) Bacteria
c) Fungi
d) Protozoa
Ans:
a) Virus
Which microorganism is used in making antibiotics?
a) Bacteria and fungi
b) Virus
c) Protozoa
d) Algae
Ans:
a) Bacteria and fungi
Which microorganism causes dengue fever?
a) Plasmodium
b) Dengue virus
c) Salmonella
d) Lactobacillus
Ans:
b) Dengue virus
Microorganisms that
cause
diseases are called:
a) Pathogens
b) Decomposers
c) Antibiotics
d) Nitrogen-fixing bacteria
Ans:
a) Pathogens
Which disease is caused by a protozoan?
a) Malaria
b) Typhoid
c) Tuberculosis
d) Polio
Ans:
a) Malaria
Which gas is released during fermentation by yeast?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Ans:
b) Carbon dioxide
34. Which microorganism is used in the preparation of vaccines?
a) Protozoa
b) Fungi
c) Bacteria and Viruses
d) Algae
Ans: c) Bacteria and Viruses
35. Which of the following microorganisms helps in decomposing organic waste?
a) Virus
b) Fungi
c) Amoeba
d) None of these
Ans: b) Fungi
36. Which method is commonly used to preserve milk for a longer time?
a) Boiling
b) Pasteurization
c) Freezing
d) Drying
Ans: b) Pasteurization
37. Which bacteria are responsible for nitrogen fixation in leguminous plants?
a) Salmonella
b) Lactobacillus
c) Rhizobium
d) Penicillium
Ans: c) Rhizobium
38. Which of the following causes food spoilage?
a) Yeast
b) Bacteria
c) Fungi
d) All of these
Ans: d) All of these
39. Which of the following is a bacterial disease?
a) Polio
b) Influenza
c) Cholera
d) Dengue
Ans: c) Cholera
40. Which scientist discovered penicillin, the first antibiotic?
a) Alexander Fleming
b) Louis Pasteur
c) Edward Jenner
d) Robert Koch
Ans: a) Alexander Fleming
