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Micro-organisms friend and foe Science - Micro-organisms friend and foe

Maharashtra Board - STD 8 - Science (MSBSHSE - Semi English Medium). 108 questions in this chapter.

Question types

Micro-organisms friend and foe question types

108 questions across 6 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

108
Questions
6
Question groups
5
Question types
Sample Questions

Micro-organisms friend and foe questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
The process of conversion of sugar into alcohol is called:
  • A
    Nitrogen fixation.
  • B
    Moulding.
  • ✓
    Fermentation.
  • D
    Infection.

Answer: C.

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Q 2MCQ1 Mark
Which of the following cannot be used as a food preservative?
  • A
    Sodium metabisulphite.
  • ✓
    Sodium hydroxide.
  • C
    Sodium benzoate.
  • D
    Citric acid.

Answer: B.

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Q 3MCQ1 Mark
Which of the following is not a use of micro$-$organisms?
  • A
    Preparation of medicines $($or drugs$).$
  • B
    Preparation of food by photosynthesis.
  • C
    Recycling of materials in nature.
  • ✓
    Increasing the fertility of soil.

Answer: D.

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Q 4MCQ1 Mark
Which of the following is not a communicable disease?
  • A
    Cholera.
  • ✓
    Cancer.
  • C
    Chickenpox.
  • D
    Malaria.

Answer: B.

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Q 5MCQ1 Mark
The most common carrier of communicable diseases is:
  • A
    Ant
  • ✓
    Housefly
  • C
    Dragonfly
  • D
    Spider

Answer: B.

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Q 8Fill In The Blanks.1 Mark
Fill in the following blanks with suitable words:
As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less _______.
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