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Microorganisms - Friend and Foe (Class VIII)

Microorganisms Friend and Foe

16 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following can be used as food preservative(s)?

a. Sodium benzoate
b. Sodium hydroxide
c. Citric acid
d. Butachlor

  1. Only a and c
  2. Only a and b
  3. Only b and d
  4. Only a and d
  5. Only c and d
Question 2 Multiple Choice (Single Answer)

Which of the following are single-celled microorganisms?

a. Viruses
b. Bacteria
c. Protozoa
d. Fungi

  1. Only a and b
  2. Only b and d
  3. Only a and c
  4. Only a and d
  5. Only b and c
Question 3 Multiple Choice (Single Answer)

Which of the following do not increase the fertility of soil?

a. Rhizobium bacteria
b. Blue-green algae
c. Lactobacillus bacteria
d. Spirogyra algae

  1. Only a and b
  2. Only b and c
  3. Only a and c
  4. Only c and d
  5. Only a and d
Question 4 Multiple Choice (Single Answer)

Which of the following do not show most of the characteristics of living things and can reproduce and multiply only inside the cells of other organisms?

  1. Viruses
  2. Bacteria
  3. Protozoa
  4. Algae
  5. Fungi
Question 5 Multiple Choice (Single Answer)

Which of the following diseases cannot be cured with antibiotics?

  1. Influenza
  2. Cholera
  3. Malaria
  4. Typhoid
  5. Athlete's foot
Question 6 Multiple Choice (Single Answer)

Which of the following are multi-cellular algae?

a. Chlamydomonas
b. Diatoms
c. Blue-green algae
d. Spirogyra

  1. Only a and b
  2. Only b and c
  3. Only a and c
  4. Only c and d
  5. Only a and d
Question 7 Multiple Choice (Single Answer)

Which of the following fungi is not made up of fine threads called hyphae?

  1. Penicillium
  2. Aspergillus
  3. Rhizopus
  4. Toadstool
  5. Yeast
Question 8 Multiple Choice (Single Answer)

Which of the following diseases cannot be prevented by vaccination of children at a proper age?

  1. Tetanus
  2. Diphtheria
  3. Measles
  4. Influenza
  5. Tuberculosis
Question 9 Multiple Choice (Single Answer)

In which of the following ways do communicable diseases not spread?

  1. By sharing infected injection needles
  2. By shaking hands with infected persons
  3. By breathing of air containing microorganisms
  4. By taking infected food or water
  5. Through insect bites
Question 10 Multiple Choice (Single Answer)

Match the following:

 
a. Bacteria 1. They do not have chlorophyll and do not show photosynthesis.
b. Fungi 2. They have cell walls, but do not have an organised nucleus and other structures.
c. Algae 3. They are plant-like organisms containing chlorophyll and producing food by photosynthesis.
  1. a - 3, b - 1, c - 2
  2. a - 2, b - 1, c - 3
  3. a - 1, b - 2, c - 3
  4. a - 1, b - 3, c - 2
  5. a - 2, b - 3, c - 1
Question 11 Multiple Choice (Single Answer)

Which of the following microorganisms promotes the formation of curd from milk?

  1. Yeast
  2. Acetobacter
  3. Lactobacillus
  4. Penicillium
  5. Rhizobium
Question 12 Multiple Choice (Single Answer)

Fermentation is the process of converting sugar into alcohol by the action of

  1. lactobacilli
  2. penicillium
  3. acetobacter
  4. yeast
  5. rhizobium
Question 13 Multiple Choice (Single Answer)

Which of the following is/are the fungus/fungi that cause(s) food poisoning?

a. Aspergillus
b. Salmonella
c. Clostridium botulinum

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 14 Multiple Choice (Single Answer)

Match the following:

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Agents Diseases
a. Fungi 1. Dysentery
b. Protozoa 2. Typhoid
c. Bacteria 3. Ringworm
  1. a - 3, b - 2, c - 1
  2. a - 1, b - 3, c - 2
  3. a - 1, b - 2, c - 3
  4. a - 2, b - 1, c - 3
  5. a - 3, b - 1, c - 2
Question 15 Multiple Choice (Single Answer)

Match the following:

 
Diseases Mode of transmission
a. Measles 1. Air
b. Typhoid 2. Mosquito
c. Dengue 3. Water
  1. a - 1, b - 3, c - 2
  2. a - 1, b - 2, c - 3
  3. a - 3, b - 2, c - 1
  4. a - 3, b - 1, c - 2
  5. a - 2, b - 3, c - 1
Question 16 Multiple Choice (Single Answer)

Identify the fungal disease(s) of animals from the following:

a. Anthrax
b. Foot and mouth disease
c. Aspergillosis

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
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