# Microbes in Human Welfare CBSE Class 12 PYQ Chapter Wise

> Microbes in Human Welfare CBSE Class 12 PYQs: all 20 questions from 50 official papers (2016–2026), by concept. Asked in 10 of 10 years.

Source: https://previousyearquestions.app/cbse-class-12/chapters/bio-microbes/

Explore: <a href="/cbse-class-12/chapters/">All CBSE Class 12 chapters</a> · <a href="/cbse-class-12/chapters/biology/">CBSE Class 12 Biology PYQs</a> · <a href="/cbse-class-12/">CBSE Class 12 hub</a> · <a href="/cbse-class-12/syllabus-pattern/">Syllabus & pattern</a> · <a href="/cbse-class-12/2026/">Class 12 2026</a>

## Answer first

Microbes in Human Welfare PYQs (previous year questions) for CBSE Class 12: Microbes in Human Welfare (Biology) had **20 questions** across the 50 official CBSE Class 12 papers we tagged (2016–2026), and appeared in 10 of them. Asked in 10 of 10 years. The concepts asked in the most papers: Sewage Treatment, Biocontrol Agents, Microbes in Household Products.

## Year-wise question count

<ChapterQuestions exam="cbse-class-12" chapter="bio-microbes" part="trend" />

## Most-asked concepts

Sorted by the number of papers a concept appeared in.

<ChapterQuestions exam="cbse-class-12" chapter="bio-microbes" part="concepts" />

## How to practise Microbes in Human Welfare PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year's Microbes in Human Welfare questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

## Questions by year

Each line gives the question number and paper, type, concept, our one-line summary, with a link to the official PDF.

<ChapterQuestions exam="cbse-class-12" chapter="bio-microbes" part="questions" />

## Other Biology chapters

- [Reproduction in Organisms PYQs](/cbse-class-12/chapters/bio-reproduction-organisms/)
- [Sexual Reproduction in Flowering Plants PYQs](/cbse-class-12/chapters/bio-plant-reproduction/)
- [Human Reproduction PYQs](/cbse-class-12/chapters/bio-human-reproduction/)
- [Reproductive Health PYQs](/cbse-class-12/chapters/bio-reproductive-health/)
- [Principles of Inheritance and Variation PYQs](/cbse-class-12/chapters/bio-inheritance/)
- [Molecular Basis of Inheritance PYQs](/cbse-class-12/chapters/bio-molecular-inheritance/)
- [Evolution PYQs](/cbse-class-12/chapters/bio-evolution/)
- [Human Health and Disease PYQs](/cbse-class-12/chapters/bio-human-health/)
- [Strategies for Enhancement in Food Production PYQs](/cbse-class-12/chapters/bio-food-production/)
- [Biotechnology: Principles and Processes PYQs](/cbse-class-12/chapters/bio-biotech-principles/)
- [Biotechnology and its Applications PYQs](/cbse-class-12/chapters/bio-biotech-applications/)
- [Organisms and Populations PYQs](/cbse-class-12/chapters/bio-organisms-populations/)
- [Ecosystem PYQs](/cbse-class-12/chapters/bio-ecosystem/)
- [Biodiversity and Conservation PYQs](/cbse-class-12/chapters/bio-biodiversity/)
- [Environmental Issues PYQs](/cbse-class-12/chapters/bio-environmental-issues/)

## FAQ

### How many Microbes in Human Welfare questions come in CBSE Class 12?
In the official papers we tagged: 1 in 2026, 1 in 2025, 1 in 2024, 2 in 2023, 4 in 2022, 2 in 2020, 3 in 2019, 2 in 2018, 2 in 2017 and 2 in 2016. That is 20 questions in all, about 7% of Biology.

### Which Microbes in Human Welfare topics repeat in CBSE Class 12?
Asked in the most papers: Sewage Treatment, Biocontrol Agents, Microbes in Household Products. The concept table lists every one with its count.

### Are these official CBSE Class 12 questions?
Yes. Every question is from an official CBSE Class 12 paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.