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BECE (Ghana) Microorganisms — practice questions

Explore 3 free Microorganisms questions in BECE (Ghana) Science. 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 1–3 of 3.

What name is given to a microorganism that causes disease?Read the answer and worked solution →A village shares a water source that has been reached by sewage. Which kind of disease spreads most easily there?Read the answer and worked solution →Bread dough rises after yeast is mixed in. Which gas makes the dough rise?Read the answer and worked solution →

Worked practice questions

What name is given to a microorganism that causes disease?

  1. A pathogen
  2. A producer
  3. A predator
  4. A pollinator
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Correct answer: A. A pathogen

1. Most microorganisms are harmless and many are useful. 2. A few of them infect other organisms and make them ill. 3. Those disease causing microorganisms are called pathogens. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Harmful microorganisms_

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A village shares a water source that has been reached by sewage. Which kind of disease spreads most easily there?

  1. Airborne disease
  2. Waterborne disease
  3. Insect-borne disease
  4. Inherited disease
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Correct answer: B. Waterborne disease

1. Pathogens can travel in droplets in the air, in food, or in water. 2. Sewage carries pathogens from the gut of infected people. 3. When sewage reaches a water source, the water becomes contaminated. 4. Everyone who drinks that water may swallow the pathogens. 5. Diseases spread this way are called waterborne diseases. 6. Airborne spread would need coughing or sneezing, which is not the route here. 7. An inherited condition is passed from parents and is not caught from water. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Transmission of infectious diseases_

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Bread dough rises after yeast is mixed in. Which gas makes the dough rise?

  1. Oxygen gas
  2. Nitrogen gas
  3. Carbon dioxide
  4. Hydrogen gas
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Correct answer: C. Carbon dioxide

1. Yeast is a microorganism that feeds on the sugar in the dough. 2. As it feeds it produces carbon dioxide and alcohol. 3. Bubbles of carbon dioxide are trapped in the dough and push it upwards. 4. The alcohol is driven off later when the bread is baked. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Useful microorganisms_

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