MCQ on Microorganisms Friend and Foe Class 8
Choose the correct answer :
Question 1.
Lactobacillus present in ………………..
A) Curd
B) Milk
C) Butter
D) All of these
Answer:
A) Curd
Question 2.
One of the following added to dough for preparing bread
A) Agar
B) Clostridium
C) Yeast
D) Bacillus
Answer:
C) Yeast
Question 3.
………………….. gas is released during fermentation.
A) Carbon dioxide
B) Hydrogen
C) Sulphur
D) All of these
Answer:
A) Carbon dioxide
Question 4.
Sugars are converted into ……………….. by yeast
A) Proteins
B) Fats
C) Alcohol
D) None of these
Answer:
C) Alcohol
Question 5.
One of the following helps in curing the disease.
A) Antibiotics
B) FJain killers
C) Nutrients
D) Antigens
Answer:
A) Antibiotics
Question 6.
Immediate effect on disease are
A) Tablets
B) Syrups
C) Injections
D) All of these
Answer:
D) All of these
Question 7.
About 78% of air around us is
A) Oxygen
B) Hydrogen
C) Carbon
D) Nitrogen
Answer:
D) Nitrogen
Question 8.
Citrus canker of lemon is caused by
A) Virus
B) Bacteria
C) Protozoa
D) Insects
Answer:
B) Bacteria
Question 9.
Food poisoning is due to consumption of
A) Fresh fruits
B) Spoiled food
C) Raw food
D) Bad air
Answer:
B) Spoiled food
Question 10.
Penicillin was discovered in this year ………………..
A) 1929
B) 1932
C) 1917
D) 1940
Answer:
A) 1929
Question 11.
Rabies vaccine was discovered by
A) Jenner
B) Pasteur
C) Leeuwenhoek
D) Robert Hooke
Answer:
B) Pasteur
Question 12.
Small pox virus was discovered by ………………..
A) Pasteur
B) Flemming
C) Jenner
D) Jonas Salk
Answer:
C) Jenner
Question 13.
The vaccine that prevents Tuberculosis is ………………..
A) MMR
B) DPT
C) B.C.G
D) E.C.G
Answer:
C) B.C.G
Question 14.
Sugars are converted into alcohols by ………………..
A) Bacteria
B) Fungus
C) Yeast
D) Algae
Answer:
C) Yeast
Question 15.
Dengue and Chikungunya are spread by ………………..
A) Air
B) Water
C) Food
D) Mosquitoes
Answer:
D) Mosquitoes
Question 16.
Choose the correct matching from the following.
| List – A | List – B |
| i) Polio | a) B.C.G |
| ii) T.B | b) D.P.T |
| iii) Pertusis | c) Oral polio vaccine |
A) i – b, ii – c, iii – a
B) i – c, ii – b, iii – a
C) i – b, ii – a, iii – c
D) i – c, ii – a, iii – b
Answer:
D) i – c, ii – a, iii – b
| List – A | List – B |
| i) Polio | c) Oral polio vaccine |
| ii) T.B | a) B.C.G |
| iii) Pertusis | b) D.P.T |
Question 17.
Microorganisms which cause diseases are called ………………..
A) Vectors
B) Pathogens
C) Vaccines
D) Insects
Answer:
B) Pathogens
Question 18.
Milk is preserved by a method called ………………..
A) Sterilization
B) Pasteurization
C) Mineralization
D) None
Answer:
B) Pasteurization
Question 19.
Housefly acts as carrier for
A) Typhoid
B) Cholera
C) Amoebiasis
D) All the above
Answer:
D) All the above
Question 20.
Bacteria present in curd is
A) Lactobacillus
B) Salmonella
C) Cocci
D) Mycobacterium
Answer:
A) Lactobacillus
Question 21.
Vaccine for smallpox was discovered by
A) Pasteur
B) Flemming
C) Jenner
D) Ross
Answer:
C) Jenner
Question 22.
Malaria is caused due to ………………..
A) Protozoa
B) Bacteria
C) Virus
D) Fungus
Answer:
A) Protozoa
Question 23.
Hepatitis – A is caused by
A) Bacteria
B) Virus
C) Protozoa
D) Fugus
Answer:
B) Virus
Question 24.
Which of the following is a air-born disease ?
A) Hepatitis – A
B) Malaria
C) Cholera
D) T.B.
Answer:
D) T.B.
Question 25.
Which of the following is a viral disease ?
A) Polio
B) Typhoid
C) Malaria
D) Cholera
Answer:
A) Polio
Question 26.
Measles is due to
A) Bacteria
B) Virus
C) Protozoa
D) Fungus
Answer:
B) Virus
Question 27.
Chicken pox is caused due to
A) Bacteria
B) Virus
C) Fungus
D) Protozoa
Answer:
B) Virus
Question 28.
Dysentery is due to …………………..
A) Protozoa
B) Bacteria
C) Virus
D) Fungus
Answer:
A) Protozoa
Question 29.
Which of the following causes anthrax disease ?
A) Virus
B) Protozoa
C) Fungus
D) Bacillus anthracis
Answer:
D) Bacillus anthracis
Question 30.
Robert Koch discovered ………………..
A) Malarial parasite
B) Bacillus anthracis
C) Polio virus
D) Chicken pox virus
Answer:
B) Bacillus anthracis
Question 31.
Who discovered Penicillin ?
A) Alexander Flemming
B) Robert Koch
C) Louis Pasteur
D) Edward Jenner
Answer:
A) Alexander Flemming
Question 32.
Who discovered fermentation?
A) Flemming
B) Robert Koch
C) Louis Pasteur
D) Edward Jenner
Answer:
C) Louis Pasteur
Question 33.
Edward Jenner discovered the vaccine for ………………..
A) Cholera
B) Polio
C) Small pox
D) T.B
Answer:
C) Small pox
Question 34.
Name the microbe that is used in the large scale production of alcohol and wine.
A) Yeast
B) Lactobacillus
C) Rhizobium
D) Azatobactor
Answer:
A) Yeast
Question 35.
Which of the following is a biological nitrogen fixer ………………..
A) Lactobacillus
B) Cyanobacteria
C) Penicillin
D) Yeast
Answer:
B) Cyanobacteria
Question 36.
The first antibiotic is ………………..
A) Tetracyclin
B) Streptomycin
C) Penicillin
D) None
Answer:
C) Penicillin
Question 37.
Identify the oddman out ………………..
A) Cholera
B) Typhoid
C) Tuberculosis
D) Malaria
Answer:
D) Malaria
Question 38.
Which of the following is not a communicable diseases ?
A) Diabetes
B) Cholera
C) Typhoid
D) Malaria
Answer:
A) Diabetes
Question 39.
Which is the best method to prevent the spread of communicable disease?
A) Using a handkerchief
B) Keep a distance from the infected person
C) Shakehands with the infected person
D) A and B
Answer:
D) A and B
Question 40.
Identify the above microorganism given in the picture.
A) Spirogyra
B) Chlamydomonas
C) Amoeba
D) Paramoecium
Answer:
B) Chlamydomonas
Question 41.
Identify the above microbe.
A) Amoeba
C) Spirogyra
B) Bacteria
D) Aspergillus
Answer:
C) Spirogyra
Question 42.
Identify this unicellular micro organism.
A) Chlamydomonas
B) Spirogyra
C) Amoeba
D) Paramoecium
Answer:
C) Amoeba
Question 43.
Identify this protozoan shown in the figure.
A) Amoeba
B) Euglena
C) Plasmodium
D) Paramoecium
Answer:
D) Paramoecium
Question 44.
Identify this fungus.
A) Pencillium
B) Aspergillus
C) Breadmould
D) Yeast
Answer:
C) Breadmould
Question 45.
Can you name the above useful micro organism ?
A) Breadmould
B) Yeast
C) Lactobacillus
D) Pencillium
Answer:
D) Pencillium
Question 46.
Who am I ?
A) Pencillium
B) Spirogyra
C) Aspergillus
D) Breadmould
Answer:
C) Aspergillus
Question 47.
These are example for
A) Protozoans
B) Algae
C) Fungi
D) Viruses
Answer:
D) Viruses
Question 48.
These are examples for
A) Bacteria
B) Virus
C) Cyanobacteria
D) Fungi
Answer:
C) Cyanobacteria
Question 49.
These are the examples for
A) Protozoans
B) Algae
C) Bacteria
D) Fungi
Answer:
C) Bacteria
Question 50.
Name the microorganism lives in the root nodules of leguminous plant.
A) Yeast
B) Lactobacillus
C) Rhizobium
D) Azatobactor
Answer:
C) Rhizobium
Question 51.
Housefly spread the disease like
A) Malaria
B) Cholera
C) Typhoid
D) B and C
Answer:
B) Cholera
Question 52.
Common preservative in food industry is ……………….
A) Sodium Hydroxide
B) Sodium Benzoate
C) Sodium metabi sulphate
D) B and C
Answer:
D) B and C
Question 53.
This is the carrier for dengue virus ……………….
A) Female anopheles mosquito
B) Female aedes mosquito
C) Housefly
D) Spider
Answer:
B) Female aedes mosquito
Question 54.
This is the carrier for malarial parasite
A) Female Anopheles Mosquito
B) Housefly
C) Spider
D) Cockroach
Answer:
A) Female Anopheles Mosquito
Question 55.
The best method to store pickles is
A) Pasteurisation
B) Salting
C) Vinegar
D) Heating method
Answer:
B) Salting
Question 56.
Yeast is used in the large scale production of ………………….
A) alcohol
B) wine
C) sugar
D) A and B
Answer:
D) A and B
Question 57.
The process of conversion of sugars into alcohol is known as
A) Pasteurisation
B) Fermentation
C) Refrigeration
D) Sterilization
Answer:
B) Fermentation
Question 58.
Which of the following is a pathogen?
A) Lactobacillus
B) Yeast
C) Penicillium
D) Bacillus anthracis
Answer:
D) Bacillus anthracis
Question 59.
Which of the following is not a useful microbe ?
A) Yeast
B) Penicillium
C) Rhizobium
D) Polio virus
Answer:
D) Polio virus
Question 60.
Vaccines are made up of ……………….
A) Chemicals
B) Weak microorganisms
C) Drugs
D) Viruses
Answer:
B) Weak microorganisms
Question 61.
The bacterium present in curd is ……………….
A) Salmonella typhi
B) Lactobacillus
C) Vibrio cholerae
D) Penicillin
Answer:
B) Lactobacillus
Question 62.
Which of the following microorganism is involved in nitrogen fixation?
A) Rhizobium
B) Aspergillus
C) Chlamydomonas
D) Spirogyra
Answer:
A) Rhizobium
Question 63.
Which of the following is a product of fermentation ?
A) Alcohol
B) Nitrogen
C) Oxygen
D) Starch
Answer:
A) Alcohol
Question 64.
Which of the following item can made with the help of bacteria ?
A) Ice cream
B) Butter
C) Bread
D) Curd
Answer:
D) Curd
Question 65.
Antibiotics are NOT effective against which of the following diseases ?
A) Tuberculosis
B) Cholera
C) Typhoid
D) Flu
Answer:
D) Flu
Match the following :
Question 1.
Match the names of scientists given in column A with the discovery made by them given in column B.
| column – A | column – B |
| a) Louis Pasteur | i) Anthrax Bacteria |
| b) Robert Koch | ii) Penicillin |
| c) Edward Jenner | iii) Fermentation |
| d) Alexander Flemming | iv) Smallpox vaccine |
| v) Typhoid |
Answer:
a – iii, b – i, c – iv, d – ii
| column – A | column – B |
| a) Louis Pasteur | iii) Fermentation |
| b) Robert Koch | i) Anthrax Bacteria |
| c) Edward Jenner | iv) Smallpox vaccine |
| d) Alexander Flemming | ii) Penicillin |