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Class XII · Biology

Microbes in Human Welfare: NEET MCQ practice

395 practice questions on Microbes in Human Welfare, including 48 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

395

Practice questions

250

Easy

138

Medium

7

Hard

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What Microbes in Human Welfare covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Microbes in household food processing
  • Industrial production
  • Sewage treatment
  • Energy generation
  • Microbes as biocontrol agents and biofertilizers

Past NEET questions on Microbes in Human Welfare

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

Which of the following is an example of non— distilled alcoholic beverage produced by yeast?

  1. A.Whisky
  2. B.Brandy
  3. C.Beer
  4. D.Rum
Show answer

Answer: C. Beer

Non-distilled alcoholic beverages are fermented but not distilled. Beer is brewed and fermented with yeast but not distilled. Whisky, brandy, and rum are all distilled spirits.

Question 2 · NEET 2025

Streptokinase produced by bacterium Streptococcus is used for

  1. A.Curd production
  2. B.Ethanol production
  3. C.Liver disease treatment
  4. D.Removing clots from blood vessels
Show answer

Answer: D. Removing clots from blood vessels

Streptokinase is an enzyme that acts as a thrombolytic agent. It activates plasminogen to form plasmin, which dissolves blood clots. Its medical use is in treating thrombotic disorders like myocardial infarction, not in food/ethanol production or liver disease.

Question 3 · NEET 2024

Match List-I with List-II relating to microbes and their products: List-I (Microbes) List-II (Products) A. Streptococcus I. Citric acid B. Trichoderma polysporum II. Clot buster C. Monascus purpureus III. Cyclosporin A D. Aspergillus niger IV. Statins Choose the correct answer from the options given below:

  1. A.A-II, B-III, C-IV, D-I
  2. B.A-I, B-II, C-III, D-IV
  3. C.A-I, B-III, C-II, D-IV
  4. D.A-I, B-IV, C-II, D-III
Show answer

Answer: A. A-II, B-III, C-IV, D-I

Streptococcus's product is streptokinase (clot buster). Trichoderma polysporum makes cyclosporin A. Monascus purpureus produces statins. Aspergillus niger produces citric acid. So A-II, B-III, C-IV, D-I.

Question 4 · NEET 2024

Given below are two statements: Statement I: Antibiotics are chemicals produced by microbes that kill other microbes. Statement II: Antibodies are chemicals formed in body that eliminate microbes. In the light of the above statements, choose the most appropriate answer from the options given below.

  1. A.Statement I is correct but Statement II is incorrect
  2. B.Statement I is incorrect but Statement II is correct
  3. C.Both Statement I and Statement II are correct
  4. D.Both Statement I and Statement II are incorrect
Show answer

Answer: C. Both Statement I and Statement II are correct

Statement I is correct: antibiotics are indeed chemicals produced by microbes to inhibit or kill other microbes. Statement II is correct: antibodies are proteins produced by the immune system to neutralize pathogens. So both are correct.

Question 5 · NEET 2022

Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A:

  1. A.Trichoderma polysporum
  2. B.Clostridium butylicum
  3. C.Aspergillus niger
  4. D.Streptococcus cerevisiae
Show answer

Answer: A. Trichoderma polysporum

Cyclosporin A is a known immunosuppressant produced by the fungus Trichoderma polysporum (now classified as Tolypocladium inflatum). The other organisms produce different metabolites.

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