CBSE  /  Class 8  /  Science  /  Microorganisms: Friend and Foe

  • 1. 
    Which bacteria helps in settling of curd?

  • Rhizobium
  • Lactobacillus
  • Vibriocholarae
  • Bacillus

  • 2. 
    Which microorganism causes AIDS?

  • A protozoa
  • A bacteria
  • A virus
  • An algae

  • 3. 
    Which of the following disease is spread due to bacteria?

  • Tuberculosis
  • Measles
  • Chicken pox
  • Polio

  • 4. 
    Which of the following is not used as food preservatives?

  • Salt
  • Sugar
  • Vinegar
  • Methane

  • 5. 
    The process by which amount of nitrogen remains the same in the atmosphere is known as

  • fermentation
  • carbon cycle
  • nitrogen cycle
  • photosynthesis
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