Edzy
AI TutorResourcesToolsCompareBuy
SearchDownload AppLogin
Edzy

Edzy for Classes 6-12

Edzy is a personal AI tutor for CBSE and State Board students, with curriculum-aligned guidance, practice, revision, and study plans that adapt to each learner.

  • Email: always@edzy.ai
  • Phone: +91 96256 68472
  • WhatsApp: +91 96256 68472
  • Address: Sector 63, Gurgaon, Haryana

Follow Edzy

Browse by Class

  • CBSE Class 6
  • CBSE Class 7
  • CBSE Class 8
  • CBSE Class 9
  • CBSE Class 10
  • CBSE Class 11
  • CBSE Class 12
Explore the CBSE resource hub

Explore Edzy

  • Study Resources
  • Free Study Tools
  • Best Apps for Board Exams
  • Edzy vs ChatGPT
  • About Us
  • Why We Built Edzy
  • Blog
  • CBSE AI Tutor

Support & Legal

  • Help & FAQs
  • Accessibility
  • Privacy Policy
  • Terms & Conditions
  • Refund Policy
  • Cookie Policy
  • Site Directory

© 2026 Edzy. All rights reserved.

Curriculum-aligned learning paths for students in Classes 6-12.

Chapter Hub

Microbes in Human Welfare

This chapter explores the significant roles of microbes in human welfare, highlighting their applications in household products, industrial processes, sewage treatment, biogas production, biocontrol agents, and biofertilizers.

Summary, practice, and revision
CBSE
Class 12
Biology
Biology

Microbes in Human Welfare

Chapter Summary

Playing 00:00 / 00:00

Download NCERT Chapter PDF for Microbes in Human Welfare – Latest Edition

Access Free NCERT PDFs & Study Material on Edzy – Official, Anytime, Anywhere

Live Challenge Mode

Ready to Duel?

Challenge friends on the same chapter, answer fast, and sharpen your concepts in a focused 1v1 battle.

NCERT-aligned questions
Perfect for friends and classmates

Why start now

Quick, competitive practice with instant momentum and zero setup.

More about chapter "Microbes in Human Welfare"

Chapter 8, 'Microbes in Human Welfare,' delves into the diverse functionalities of microbes and their essential contributions to human life. Microbes play vital roles in our daily lives, from aiding in food production, such as curd and bread, through fermentation processes, to their industrial applications in producing antibiotics and chemicals. The chapter discusses sewage treatment, emphasizing how microbial communities help purify wastewater, and explores biogas production as an alternative energy source. Furthermore, it highlights the importance of biocontrol agents in sustainable agriculture and the benefits of biofertilizers in enhancing soil fertility. Through these examples, the chapter illustrates the invaluable services microbes provide, affirming that not all microbes are harmful, but many are crucial for environmental and human health.
Learn Better On The App
One app for the full journey

The NCERT Companion

From planning to practice to revision, keep your full study workflow in one place.

Planning to practice
Everything connected

Faster access to practice, revision, and daily study flow.

Edzy mobile app preview

Microbes in Human Welfare - Class 12 Biology

Explore the critical roles of microbes in human welfare, including their applications in food production, industry, sewage treatment, biogas production, biocontrol, and biofertilizers in this informative chapter.

Microbes are integral to several household products, most notably in the fermentation of milk to produce curd. Lactic acid bacteria like Lactobacillus help coagulate milk proteins, enhancing the nutritional value by increasing vitamin B12. Other examples include fermented foods like idli and dosa, which rely on bacterial fermentation, and baker’s yeast (Saccharomyces cerevisiae) used in bread-making.
In industries, microbes such as yeasts and bacteria are essential for producing a variety of products, including alcohol, organic acids, and antibiotics. For instance, Saccharomyces cerevisiae is used for fermenting malted cereals to create ethanol. Additionally, antibiotics like penicillin, derived from fungi, play a crucial role in medicine by combating bacterial infections.
Sewage treatment involves two main stages: primary treatment, which focuses on removing solid particles through filtration and sedimentation, and secondary treatment, where aerobic microbes break down organic matter in aeration tanks, significantly reducing biochemical oxygen demand (BOD) before effluent is released into natural water bodies.
Biogas is a mixture of gases, primarily methane, produced by the anaerobic activity of microbes in the breakdown of organic material, such as cattle dung in biogas plants. These plants consist of tanks where bio-wastes are decomposed, and the gas produced can be captured and used for cooking and lighting.
Microbes serve as biocontrol agents by naturally regulating pest populations in agriculture. For example, Bacillus thuringiensis is a bacterium that produces toxins harmful to caterpillars but safe for other organisms, allowing organic farmers to reduce reliance on synthetic pesticides and promote ecosystem health.
Biofertilizers enhance soil fertility by introducing beneficial microorganisms that fix atmospheric nitrogen into forms plants can absorb. For instance, bacteria like Rhizobium form symbiotic relationships with legumes, enriching the soil, while mycorrhizal fungi help plants absorb phosphorus, promoting overall plant growth and health.
While many microbes have beneficial roles, some can be pathogenic and cause diseases in humans, animals, and plants. However, it is essential to recognize the dual nature of microbes, as numerous species are integral to health and environmental sustainability, outweighing the harmful effects of a few.
Antibiotics derived from microbes, such as penicillin, are vital in modern medicine as they inhibit or kill disease-causing bacteria. These compounds have revolutionized healthcare by effectively treating bacterial infections, significantly reducing morbidity and mortality rates associated with communicable diseases.
Microbes exhibit remarkable adaptability, allowing them to thrive in extreme conditions such as hot springs, acidic lakes, and deep-sea vents. These adaptations include unique metabolic pathways and structural characteristics that enable survival in environments where few other life forms can exist.
The chapter discusses several types of microbes including bacteria, fungi, protozoa, viruses, and prions. Each category plays distinct roles in ecological systems and biotechnology, contributing to processes such as fermentation, disease prevention, and nutrient cycling.
Microbial fermentation is crucial in producing alcoholic beverages like beer, wine, and spirits. Yeasts, especially Saccharomyces cerevisiae, convert sugars from grains and fruits into ethanol and carbon dioxide, resulting in the fermentation process that gives rise to these drinks.
Citric acid production is primarily achieved using the fungus Aspergillus niger through fermentation processes. In industrial settings, this microbe is cultivated in specially designed fermentors where it converts sugar-containing substrates into citric acid, widely used in food and beverage industries.
Sewage treatment plants (STPs) prevent environmental pollution by effectively treating wastewater before it is released into natural water bodies. By reducing the levels of harmful pathogens and organic matter through microbial activity, STPs help maintain the ecological balance in aquatic environments.
Several traditional foods rely on microbial fermentation, such as curd (produced from milk by lactic acid bacteria), dosa and idli (made with fermented rice and lentil dough), and alcoholic beverages like beer and wine that ferment using yeasts.
Methanogens are specialized bacteria that thrive in anaerobic conditions, such as in biogas plants. They convert organic waste into methane gas by decomposing cellulose and other materials, making them crucial for biogas production used as a renewable energy source.
Microbes play essential roles in nutrient cycling by decomposing organic matter, which releases nutrients back into the soil. This process supports plant growth and maintains soil fertility, highlighting the importance of microbes in ecosystem functioning.
Urbanization increases the volume of sewage generated, often outpacing the capacity of existing sewage treatment plants. This results in untreated sewage being discharged into rivers, leading to pollution and increased risks of waterborne diseases, necessitating the expansion of treatment facilities.
Prions are misfolded proteins that can induce other proteins to misfold, causing neurodegenerative diseases such as Creutzfeldt-Jakob disease. Unlike traditional pathogens, prions lack genetic material, which raises significant challenges in disease prevention and treatment.
Microbial activity can both spoil and preserve food. Beneficial microbes, such as those used in fermentation, help inhibit the growth of spoilage organisms, extending shelf life and improving flavors, while harmful microbes can lead to foodborne illnesses.
Yes, microbes can significantly reduce the reliance on chemical fertilizers. Biofertilizers, consisting of beneficial bacteria and fungi, naturally enhance soil fertility by fixing atmospheric nitrogen and improving nutrient uptake by plants, promoting sustainable agriculture.
Studying microbial diversity is crucial for understanding ecosystems, human health, and biotechnology applications. Diverse microbes contribute to various services, including nutrient cycling, disease resistance, and innovative biotechnological solutions, making their study essential for sustainability and health.

Chapters related to "Microbes in Human Welfare"

Reproductive Health

This chapter focuses on reproductive health, highlighting its significance and various related aspects. It emphasizes the importance of maintaining reproductive well-being for individuals and society.

Start chapter

Principles of Inheritance and Variation

This chapter explores the principles of inheritance and variation, focusing on how traits are passed from parents to offspring and the genetic mechanisms behind this process.

Start chapter

Molecular Basis of Inheritance

This chapter explains the molecular mechanisms behind inheritance, focusing on DNA and RNA structures, replication, transcription, and translation processes that underlie genetic expression.

Start chapter

Evolution

This chapter explores the concept of evolution, detailing the origins of life and the diversity of species on Earth. Understanding evolution is crucial for comprehending biological diversity and adaptation over time.

Start chapter

Human Health and Disease

This chapter discusses the various aspects of human health, common diseases, and their effects. Understanding these concepts is vital for promoting wellness and preventing illness.

Start chapter

Biotechnology : Principles and Processes

This chapter introduces key concepts in biotechnology, focusing on the principles and processes that enable genetic modifications in organisms, which are essential for advancements in health and food production.

Start chapter

Biotechnology and its Applications

This chapter explores biotechnology and its significant applications in agriculture and medicine, focusing on genetic modifications and their impact on human life.

Start chapter

Organisms and Populations

This chapter explores the dynamics of populations and their interactions within ecosystems, highlighting the processes that govern population growth and decline.

Start chapter

Ecosystem

This chapter explores the ecosystem's structure and functions, including energy flow and nutrient cycling, highlighting its significance in understanding environmental interactions.

Start chapter

Biodiversity and Conservation

This chapter covers the importance of biodiversity and the need for its conservation, highlighting its various forms and implications for ecosystems.

Start chapter

Microbes in Human Welfare Summary, Important Questions & Solutions | All Subjects

Question Bank

Worksheet

Revision Guide