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Olympiad (Class 8) Biology — practice by topic

Browse 30 questions across 3 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Biology (30)Microorganisms (30)Olympiad Science (30)

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Microbes are sorted into four main groups: bacteria, protozoa, algae and:Read the answer and worked solution →A child catches a common cold. Most coughs and colds are caused by:Read the answer and worked solution →Malaria and dysentery belong to the group of illnesses caused by:Read the answer and worked solution →A cook leaves warm milk with a spoon of curd overnight. The bacterium that sets the curd is:Read the answer and worked solution →

Worked practice questions

Microbes are sorted into four main groups: bacteria, protozoa, algae and:

  1. Fungi
  2. Ferns
  3. Fibres
  4. Flukes
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Correct answer: A. Fungi

1. Three of the four groups are already named. 2. The remaining group includes moulds and mushrooms. 3. That group is the fungi. _Source: syllabus Science Class VIII, Chapter 2, Microorganisms: Friend and Foe._

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A child catches a common cold. Most coughs and colds are caused by:

  1. Vacuoles
  2. Viruses
  3. Vitamins
  4. Vessels
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Correct answer: B. Viruses

1. Bacteria cause some illnesses but not these. 2. Colds spread from a far smaller agent. 3. Those agents are viruses. _Source: syllabus Science Class VIII, Chapter 2, Microorganisms: Friend and Foe._

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Malaria and dysentery belong to the group of illnesses caused by:

  1. Protozoa
  2. Proteins
  3. Propane
  4. Pronouns
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Correct answer: A. Protozoa

1. These are single-celled microbes, not viruses. 2. They are larger and more complex than bacteria. 3. They are the protozoa. _Source: syllabus Science Class VIII, Chapter 2, Microorganisms: Friend and Foe._

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