Microbes in Human Welfare — Chapter Summary
Tamil Nadu Board · Class 12 · Zoology
Summary of Microbes in Human Welfare for Tamil Nadu Board Class 12 Zoology. Part of the Tamil Nadu Board Class 12 Zoology syllabus.
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Overview
Microbes are microscopic organisms including bacteria, fungi, protozoa, algae, viruses, viroids, and prions that are present everywhere in our environment - in soil, water, air, and within living organisms. While many microbes are associated with diseases, a significant number are highly beneficial
Key Concepts
Probiotics are live beneficial microorganisms (like
Probiotics are live beneficial microorganisms (like Lactobacillus acidophilus, L. lactis, and Streptococcus lactis) that provide health benefits when
Lactobacillus species convert milk protein (casein)
Lactobacillus species convert milk protein (casein) and lactose into lactic acid through fermentation. When a small amount of curd (containing million
Cheese is produced by coagulation
Cheese is produced by coagulation of milk protein casein using acid and the enzyme rennet. Starter bacteria like Lactococcus, Lactobacillus, or Strept
Bread dough is fermented by Saccharomyces
Bread dough is fermented by Saccharomyces cerevisiae (baker's yeast), which ferments glucose into ethanol and CO₂. The CO₂ causes leavening (rising) o
Edible unicellular microorganisms like Spirulina can
Edible unicellular microorganisms like Spirulina can be grown as protein-rich sources. Protein extracts from cultures of algae, yeasts, fungi, or bact
Learning Objectives
- Differentiate between probiotics and pathogens and understand their roles in human health
- Identify microbes used in household products like curd, yogurt, cheese, bread, and idli/dosa preparation
- Learn about antibiotic production from microorganisms and understand antibiotic resistance
- Understand fermented beverages production including wine, beer, whisky, and industrial alcohol
- Explore microbial production of organic acids, enzymes, and bioactive pharmaceutical compounds
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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