Microorganisms Friend or foe MCQ

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MCQ Microorganisms Friend or foe Chapter 2 Science 

We call microorganisms micro because:

  • a. We can not see them thru the naked eye.
  • b. they are very small.
  • c. Both
Answer
c. Both

Identify which is/are microrganisms

  • a. Bacteria
  • b. Fungi
  • c. Virus
  • d. All
Answer
d. All

Which microorganism reproduce only inside hos cells.

  • a. Bacteria
  • b. Fungi
  • c. Virus
  • d. Protist
Answer
c. Virus

Dysentry and malaria are:

  • a. Fungal disease
  • b. Protozoal disease
  • c. Viral disease
  • d. Bacterial disease

Cold, flu, influenza, and most coughs are caused by:

  • a. Bacteria
  • b. Fungi
  • c. Virus
  • d. Protist
Answer
c. Virus

Which of the following is a friendly microorganism?

  • a. Nitrogen-fixing bacteria
  • b. Curd forming lactobacillus
  • c. Antibiotic producing fungus
  • d. All of the abobe.
Answer
d. All of the above

Why do we use yeast in making bread

  • a. It raises the dough
  • b. It sweetens the dough
  • c. Removes the bitterness of dough
  • d. It removes harmful toxins
Answer
a. It raises the dough

Fermentation is:

  • a. Ripening of fruits
  • b. Raising of dough
  • c. Formation of alcohol from sugar
  • d. Formation of molds on the bread
Answer
c. Formation of alcohol from sugar

Which among these are antibiotics:

  • a. Penicillin
  • b. Streptomycin
  • c. Tetracyclin
  • d. All of the abobe.
Answer
d. All of the above

The first vaccine discovered was:

  • a. Smallpox vaccine
  • b. Polio vaccine
  • c. BCG vaccine
  • d. None of the above
Answer
a. Smallpox vaccine
Explanation
Edard Jenner first discovered the small pox vaccine. He found out that milkmans exposed to cows with pox virus do not catch small pox. He Took some extract from the infected cow and injected the formulation to his child. By this his child became immune to small pox and the first vaccine came into existence.

Why fungus is helpful to us?

  • a. Some fungus cause diseases in humans.
  • b. The fungus lives on decaying material. They clean the earth.
  • c.  Fungus are poisonous.
  • d. They cause rust in wheat.
Answer
b. Fungus live on decaying material. They clean the earth.

Which among these is  a communicable disease?

  • a. Malaria
  • b. Dengue
  • c. Both a and b
  • d. Rashes
Answer
c. Both a and b
Explanation
Communicable disease transfer from one organism to other. Cold, cough, flu, influenza, malaria, dengue, etc are communicable disease.
Microorganisms Friend or foe MCQ

Femal aedes mosquito is a carrier as it carries _ _ _ _  from one person to another

  • a. Dengue.
  • b. Cold.
  • c. Flu.
  • d. Malaria
Answer
d. Malaria

Which among these have no chance of food poisoning:

  • a. Foul-smelling milk.
  • b. Rotten apple.
  • c. Freshly prepared food.
  • d. Decaying meat.
Answer
c. Freshly prepared food.

Which among these is a method of food preservation:

  • a. Adding salt.
  • b. Adding milk.
  • c. Pasteurisation.
  • d. a and c.
Answer
d. a and c
Explanation
We can preserve food by various means. Some are adding salt or sugar, adding preservatives, pasteurisation etc.

 

See also:

Crop Production and Management MCQ

 

MCQ Microorganisms: Friend or foe Chapter 2 Science 

 

Ref: Ncert class 8.

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