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Biology Olympiad Microorganisms — practice questions

Explore 30 free Microorganisms questions in Biology Olympiad Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Microorganisms questions and exercises with answers

Showing questions 1–30 of 30.

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 →Besides curd, bacteria are also used to make pickles and:Read the answer and worked solution →Sugar solution with yeast starts to smell of alcohol. Turning sugar into alcohol is called:Read the answer and worked solution →Bakers use yeast in dough because yeast is able to reproduce very:Read the answer and worked solution →A doctor prescribes a medicine that kills disease-causing microbes. Such medicines are called:Read the answer and worked solution →These medicines are manufactured by growing specific bacteria and:Read the answer and worked solution →Dead or weakened microbes put into a healthy body make it produce:Read the answer and worked solution →Because those defences stay in the body afterwards, the injection given is called a:Read the answer and worked solution →Edward Jenner discovered the vaccine for smallpox in the year:Read the answer and worked solution →Children are protected against polio by a vaccine given as:Read the answer and worked solution →Certain soil bacteria enrich the soil by fixing from the air the gas called:Read the answer and worked solution →Microbes that do that work are commonly called biological nitrogen:Read the answer and worked solution →The bacterium living in the root nodules of beans and peas is:Read the answer and worked solution →Nitrogen can also be fixed in the atmosphere itself by the action of:Read the answer and worked solution →The insect that carries disease microbes from garbage onto uncovered food is the:Read the answer and worked solution →Malaria is spread by the mosquito carrier named:Read the answer and worked solution →Dengue virus is carried by the female mosquito of the group:Read the answer and worked solution →A simple way to stop mosquitoes multiplying is to remove all standing:Read the answer and worked solution →For pasteurisation, milk is heated to about 70 degrees Celsius and then suddenly:Read the answer and worked solution →Catch the microbe groupsRead the answer and worked solution →Pop the helpful microbesRead the answer and worked solution →Run the microbe gatesRead the answer and worked solution →Slice the microbe wordsRead the answer and worked solution →Friend or foeRead the answer and worked solution →Sort the microbe wordsRead the answer and worked solution →Type the numberRead the answer and worked solution →Microbes bingoRead 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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