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Microbial Culture

CBSE · Class 12 · Biotechnology

Quick revision notes for Microbial Culture — CBSE Class 12 Biotechnology. Key concepts, formulas, and definitions for last-minute revision.

63 questions84 flashcards5 concepts

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A comparison diagram showing Louis Pasteur's swan-neck flask experiment, illustrating how life does not arise spontaneously from non-living matter.
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Key Topics to Revise

1

Historical Perspective

  • Antonie van Leeuwenhoek developed the microscope in the 1670s to 1680s and observed microscopic organisms, which he called animalcules.
  • Lazzaro Spallanzani found no microscopic life in boiled broth, which challenged spontaneous generation.
  • Louis Pasteur used swan-neck flask experiments and disproved spontaneous generation.
2

Nutritional Requirements and Types of Media

  • Microorganisms need carbon, oxygen, hydrogen, nitrogen, sulfur, phosphorus, potassium, calcium, magnesium, iron, water, and growth factors for growth and multiplication.
  • Carbon, oxygen, hydrogen, nitrogen, sulfur, phosphorus, potassium, calcium, magnesium, and iron are macronutrients and are needed in relatively large amounts.
  • Heterotrophs obtain carbon from organic molecules.
3

Sterilisation Methods

  • Sterilisation means removing or killing all living microorganisms, including bacterial spores.
  • Sterilisation can be achieved by physical methods and chemical methods.
  • Physical methods include heat, radiation, and filtration.
4

Pure Culture Techniques

  • A pure culture consists of entirely one strain of organism.
  • Pure culture is important for studying a specific microbe.
  • Solid media are especially useful for isolating bacteria and for long-term storage.

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Full Notes

Key Concepts

Antonie van Leeuwenhoek developed the microscopeCulture media are materials usedDefined media or synthetic media haveLiquid media or broth contain noSelective media favour the growth

Frequently Asked Questions

What are the important topics in Microbial Culture for CBSE Class 12 Biotechnology?
Microbial Culture 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 Microbial Culture — CBSE Class 12 Biotechnology?
Understand the core concepts first, then work through the 63 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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