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Home › Biology › Microorganisms

Microorganisms — Biology Questions & Practice

Practise 20 Microorganisms questions from Biology for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Microorganisms — with answers

Try each question first, then open the answer. Explanations are included.

1. The microorganism 'Lactobacillus' is primarily used/known for which process?

  1. Aconverting alcohol into acetic acid (vinegar)
  2. Bproducing citric acid through industrial fermentation
  3. Cfermenting sugars to produce alcohol and carbon dioxide, used in baking and brewing
  4. Dconverting milk into curd (yogurt) through fermentation
Show answer

Answer: D

Lactobacillus is the microorganism primarily used/known for converting milk into curd (yogurt) through fermentation.

2. Which microorganism is primarily used/known for converting milk into curd (yogurt) through fermentation?

  1. AStreptomyces
  2. BLactobacillus
  3. CPenicillium
  4. DAzotobacter
Show answer

Answer: B

Lactobacillus is the microorganism primarily used/known for converting milk into curd (yogurt) through fermentation.

3. Which microorganism is primarily used/known for fermenting sugars to produce alcohol and carbon dioxide, used in baking and brewing?

  1. AAspergillus niger
  2. BSaccharomyces cerevisiae (yeast)
  3. CRhizobium
  4. DLactobacillus
Show answer

Answer: B

Saccharomyces cerevisiae (yeast) is the microorganism primarily used/known for fermenting sugars to produce alcohol and carbon dioxide, used in baking and brewing.

4. The microorganism 'Rhizobium' is primarily used/known for which process?

  1. Afixing atmospheric nitrogen in the root nodules of leguminous plants
  2. Bconverting alcohol into acetic acid (vinegar)
  3. Cconverting milk into curd (yogurt) through fermentation
  4. Dproducing citric acid through industrial fermentation
Show answer

Answer: A

Rhizobium is the microorganism primarily used/known for fixing atmospheric nitrogen in the root nodules of leguminous plants.

5. Which microorganism is primarily used/known for fixing atmospheric nitrogen in the root nodules of leguminous plants?

  1. ASaccharomyces cerevisiae (yeast)
  2. BAcetobacter aceti
  3. CAzotobacter
  4. DRhizobium
Show answer

Answer: D

Rhizobium is the microorganism primarily used/known for fixing atmospheric nitrogen in the root nodules of leguminous plants.

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