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Microbes in Human Welfare

CBSE · Class 12 · Biology

Complete topic list for Microbes in Human Welfare in CBSE Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.

50 questions108 flashcards5 concepts

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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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4 Topics · CBSE Class 12 Biology

Topics in Microbes in Human Welfare

1

Microbes in Household Products

  • Lactobacillus and other lactic acid bacteria (LAB) grow in milk and convert it into curd.
  • LAB produce acids that coagulate and partially digest milk proteins during curd formation.
  • A small amount of curd added to fresh milk as a starter contains millions of LAB and helps rapid curd formation at suitable temperature.
2

Microbes in Industrial Products

  • Industrial-scale microbial production is done in large vessels called fermentors.
  • Yeast, especially Saccharomyces cerevisiae, is used for commercial production of ethanol.
  • Wine and beer are produced without distillation.
3

Microbes in Sewage Treatment

  • Sewage is municipal waste-water containing large amounts of organic matter and pathogenic microbes.
  • Sewage cannot be discharged directly into rivers and streams.
  • Sewage treatment is carried out in two stages: primary treatment and secondary treatment.
4

Microbes in Production of Biogas

  • Biogas is a mixture of gases containing predominantly methane, produced by microbial activity and used as fuel.
  • Certain bacteria grow anaerobically on cellulosic material and produce methane, carbon dioxide, and hydrogen.
  • These bacteria are called methanogens.

Key Concepts

Central concept: Uses of microbes in household products, industry, sewage treatment, biogas production, biocontrol, and biofertilisers

Microbes in household productsMicrobes in industrial productsMicrobes in sewage treatmentMicrobes in biogas productionMicrobes as biocontrol agentsMicrobes as biofertilisers

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?
Understand the core concepts first, then work through the 50 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall 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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