BrainIt

Microbes in Human Welfare: NEET previous year questions

Every Microbes in Human Welfare question from the official NEET papers on this site, with the answer and a worked solution.

The questions come from NEET 2026, Re-NEET 2026 and NEET 2020. Each shows its answer and solution when you open it, so you can attempt it first. For what the chapter covers and how NEET tests it, see the Microbes in Human Welfare guide.

Practise on the CBT screen5 questions, 5 minutes, marked +4 / −1Download PDF3 pages, 0.8 MB, with answers and solutions

NEET 2026 · the full paper

  1. NEET 2026 · Q158

    Match List I with List II

    List I (Bioactive molecules)

    List II (Importance)

    P) Streptokinase

    I) Immunosuppressive agent

    Q) Statins

    II) Removal of clots from the blood vessels

    R) Lipases

    III) Blood cholesterol-lowering agent

    S) Cyclosporin A

    IV) Detergent formulations

    Choose the correct answer from the options given below.

    1. (1)

      P-II, Q-III, R-I, S-IV

    2. (2)

      P-IV, Q-III, R-II, S-I

    3. (3)

      P-III, Q-II, R-IV, S-I

    4. (4)

      P-II, Q-III, R-IV, S-I

    Answer and solution

    Answer: (4)

    Streptokinase is a clot buster that removes clots from blood vessels (P-II), statins are blood cholesterol-lowering agents (Q-III), lipases are used in detergent formulations (R-IV), and cyclosporin A is an immunosuppressive agent used in organ transplants (S-I). This gives P-II, Q-III, R-IV, S-I, which is option (4).

  2. NEET 2026 · Q171

    What is the reason behind production of large holes in 'Swiss Cheese'?

    1. (1)

      The production of large amount of CO2\mathrm{CO}_{2} by Propionibacterium sharmanii

    2. (2)

      The production of large amount of CO2\mathrm{CO}_{2} by Clostridium butylicum

    3. (3)

      The production of large amount of CO2\mathrm{CO}_{2} and H2H_2 by lactic acid bacteria called Lactobacillus

    4. (4)

      The production of large amount of CO2\mathrm{CO}_{2} and H2H_2 by Trichoderma polysporum

    Answer and solution

    Answer: (1)

    The large holes (eyes) characteristic of Swiss cheese are produced by large amounts of CO2\mathrm{CO}_{2} released by the bacterium Propionibacterium sharmanii during ripening. Clostridium is associated with butyric acid production, Lactobacillus with curd formation, and Trichoderma is a fungus (source of cyclosporin A). Hence the correct reason is CO2\mathrm{CO}_{2} from Propionibacterium sharmanii.

Re-NEET 2026 · the full paper

  1. Re-NEET 2026 · Q136

    Which of the following is used as a clot buster?

    1. (1)

      Streptokinase

    2. (2)

      Penicillin

    3. (3)

      Cyclosporin A

    4. (4)

      Statins

    Answer and solution

    Answer: (1)

    Streptokinase is produced by the bacterium Streptococcus and modified by genetic engineering; it dissolves the clots that block blood vessels in patients with myocardial infarction, which is why it is called a clot buster. The other three are also microbial products but with quite different uses. NCERT Class 12, Microbes in Human Welfare.

NEET 2020 · the full paper

  1. NEET 2020 · Q43

    Match the following columns and select the correct option.

    List I

    List II

    P) Clostridium butylicum

    I) Cyclosporin A

    Q) Trichoderma polysporum

    II) Butyric acid

    R) Monascus purpureus

    III) Citric acid

    S) Aspergillus niger

    IV) Blood-cholesterol-lowering agent

    1. (1)

      P-II, Q-I, R-IV, S-III

    2. (2)

      P-I, Q-II, R-IV, S-III

    3. (3)

      P-IV, Q-III, R-II, S-I

    4. (4)

      P-III, Q-IV, R-II, S-I

    Answer and solution

    Answer: (1)

    Clostridium butylicum produces butyric acid; Trichoderma polysporum produces cyclosporin A; Monascus purpureus produces statins that lower blood cholesterol; and Aspergillus niger produces citric acid. Thus P-II, Q-I, R-IV, S-III. Chapter: Microbes in Human Welfare.

  2. NEET 2020 · Q55

    Which of the following is put into Anaerobic sludge digester for further sewage treatment?

    1. (1)

      Floating debris

    2. (2)

      Effluents of primary treatment

    3. (3)

      Activated sludge

    4. (4)

      Primary sludge

    Answer and solution

    Answer: (3)

    Activated sludge, which contains microorganisms, is added to the anaerobic sludge digester to further break down organic matter in the sewage. Chapter: Microbes in Human Welfare.

Practise Microbes in Human Welfare in the app: it brings back the questions you get wrong, so the chapter improves, not just your memory of these. Or try the free CBT mock. All chapters: NEET chapter-wise PYQs.

Questions

Are these the official NEET questions on Microbes in Human Welfare?

Yes. They are the questions NTA set in each paper, in its wording. The solutions are written by BrainIt.

Something here wrong or out of date? Email hello@brainit.pro and a person will read it.