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Biology

Microbes in Human Welfare

A Biology chapter of the NEET syllabus, and how to practise it for the computer-based exam.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Microbes in Human Welfare carried 3 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Microbes in Human Welfare, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

Which of the following is used as a clot buster?
  1. A.Streptokinase
  2. B.Penicillin
  3. C.Cyclosporin A
  4. D.Statins
Answer and explanation

Answer: A

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 2 · NEET 2026

What is the reason behind production of large holes in 'Swiss Cheese'?
  1. A.The production of large amount of CO2\mathrm{CO}_{2} by Propionibacterium sharmanii
  2. B.The production of large amount of CO2\mathrm{CO}_{2} by Clostridium butylicum
  3. C.The production of large amount of CO2\mathrm{CO}_{2} and H2H_2 by lactic acid bacteria called Lactobacillus
  4. D.The production of large amount of CO2\mathrm{CO}_{2} and H2H_2 by Trichoderma polysporum
Answer and explanation

Answer: A

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.

How to practise Microbes in Human Welfare

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free NEET mini mock with answers.

Nearby Biology chapters

Questions

How many questions did Microbes in Human Welfare have in NEET 2026?

Microbes in Human Welfare carried 3 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Microbes in Human Welfare PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Microbes in Human Welfare important for NEET 2027?

It is part of the Biology syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

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