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Microbes in Human Welfare

Tamil Nadu Board · Class 12 · Zoology

Flashcards for Microbes in Human Welfare — Tamil Nadu Board Class 12 Zoology. Quick Q&A cards covering key concepts, definitions, and formulas.

45 questions25 flashcards5 concepts

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Card 1Microbes in Household Products

What are probiotics and how do they differ from pathogens?

Answer

Probiotics are live beneficial microorganisms that provide health benefits when consumed, primarily by improving gut flora. Unlike pathogens which cause disease, probiotics prevent the growth of harmf

Card 2Microbes in Household Products

Describe the process of curd formation from milk using lactic acid bacteria.

Answer

Curd formation is a fermentation process where lactic acid bacteria (LAB) like Lactobacillus species are added to fresh milk as a starter culture. At suitable temperature (≤40°C), these bacteria multi

Card 3Microbes in Household Products

What is the role of Streptococcus thermophilus and Lactobacillus bulgaricus in yogurt production?

Answer

These two microorganisms work together to produce yogurt through bacterial fermentation of milk. S. thermophilus and L. bulgaricus coagulate the milk protein and convert lactose into lactic acid. The

Card 4Microbes in Household Products

How does Propionibacterium shermanii contribute to the characteristic appearance of Swiss cheese?

Answer

Propionibacterium shermanii is a bacterium used as a starter culture in Swiss cheese production. During fermentation, this bacterium produces large amounts of carbon dioxide (CO2) gas as a metabolic b

Card 5Microbes in Household Products

What is the difference between the fermentation microbes used in idli/dosa versus bread making?

Answer

Idlis and dosas use Leuconostoc mesenteroides, a bacterium that ferments the dough and produces lactic acid, giving these foods their characteristic sour taste and fluffy texture. In contrast, bread m

Card 6Microbes in Household Products

What is Single Cell Protein (SCP) and why is it nutritionally important?

Answer

Single Cell Protein refers to edible unicellular microorganisms, most commonly Spirulina, that serve as protein-rich food sources. SCP is produced from pure or mixed cultures of algae, yeasts, fungi,

Card 7Microbes in Industrial Products

Define antibiotic and explain what 'antibiosis' means in the context of antibiotics.

Answer

An antibiotic is a chemical substance produced by microorganisms that can kill or retard the growth of other disease-causing microbes, even in low concentrations. The term 'antibiotic' literally means

Card 8Microbes in Industrial Products

Describe Alexander Fleming's discovery of penicillin and its significance.

Answer

In 1926, Alexander Fleming observed a green mold (later identified as Penicillium notatum) growing on one of his unwashed culture plates. Around this mold, Staphylococci bacteria could not grow, indic

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Frequently Asked Questions

What are the important topics in Microbes in Human Welfare for Tamil Nadu Board Class 12 Zoology?
Key topics in Microbes in Human Welfare include Microbes in Human Welfare — Chapter Overview, Mind map showing major categories of microbial applications in human welfare, including household products, industrial manufacturing, sewage treatment, energy generation, and environmental remediation, Flowchart distinguishing between probiotics (live beneficial organisms) and prebiotics (fibers that support them), showing how both contribute to gut health and disease prevention. These are the concepts Tamil Nadu Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Microbes in Human Welfare — Tamil Nadu Board Class 12 Zoology?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Microbes in Human Welfare?
There are 25 flashcards for Microbes in Human Welfare covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

Sources & Official References

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

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