Biology · chapter PYQs

Microbes in Human Welfare, on the exam screen.

5 questions from NEET 2026, Re-NEET 2026, NEET 2020, 5 minutes, marked +4 / −1. See them with solutions.

Microbes in Human Welfare · PYQs

Candidate: You

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Q1/5

Question 1 · NEET 2026 · Q158 · +4 / −1

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.

Answer and explanation

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).

Question 2 · NEET 2026 · Q171 · +4 / −1
What is the reason behind production of large holes in 'Swiss Cheese'?
Answer and explanation
Answer: (1)
The large holes (eyes) characteristic of Swiss cheese are produced by large amounts of $\mathrm{CO}_{2}$ 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 $\mathrm{CO}_{2}$ from Propionibacterium sharmanii.
Question 3 · Re-NEET 2026 · Q136 · +4 / −1
Which of the following is used as a clot buster?
Answer and explanation
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.
Question 4 · NEET 2020 · Q43 · +4 / −1
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
Answer and explanation
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.
Question 5 · NEET 2020 · Q55 · +4 / −1
Which of the following is put into Anaerobic sludge digester for further sewage treatment?
Answer and explanation
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.

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