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Microbes in Human Welfare

CBSE · Class 12 · Biology

Quick revision notes for Microbes in Human Welfare — CBSE Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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An infographic illustrating the different types of microbes (bacteria, fungi, viruses, protozoa, prions) with representative examples and their general characteristics or shapes.
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Key Topics to Revise

1

Microbes in Food Processing

  • Lactic Acid Bacteria (LAB) convert milk to curd by producing acids that coagulate milk proteins
  • Curd formation improves nutritional quality by increasing vitamin B12 content
  • LAB in stomach helps check disease-causing microbes
2

Industrial Production by Microbes

  • Fermentors are large vessels used for industrial-scale microbial production
  • Alcoholic beverages: wine, beer (without distillation), whisky, brandy, rum (with distillation)
  • Saccharomyces cerevisiae used for ethanol production in all alcoholic beverages
3

Sewage Treatment

  • Sewage contains large amounts of organic matter and pathogenic microbes
  • Primary treatment: Physical removal through filtration and sedimentation
  • Secondary treatment: Biological treatment using aerobic microbes in aeration tanks
4

Biogas Production

  • Biogas: Mixture of gases (predominantly methane) produced by microbial activity
  • Methanogens: Bacteria that produce methane from cellulosic material under anaerobic conditions
  • Methanobacterium: Common methanogenic bacteria found in sewage sludge and cattle rumen

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Full Notes

Key Concepts

Lactic Acid Bacteria (LAB) like LactobacillusMicrobes are used in large fermentorsAntibiotics are chemical substances produced byMunicipal sewage treatment occurs in twoMethanogens like Methanobacterium produce methane from

Frequently Asked Questions

What are the important topics in Microbes in Human Welfare for CBSE Class 12 Biology?
Microbes in Human Welfare covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Microbes in Human Welfare — CBSE Class 12 Biology?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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