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Economic Importance of Bacteria and Fungi

ICSE · Class 9 · Biology

Quick revision notes for Economic Importance of Bacteria and Fungi — ICSE Class 9 Biology. Key concepts, formulas, and definitions for last-minute revision.

42 questions47 flashcards5 concepts

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A labeled diagram illustrating the four main morphological shapes of bacteria: Coccus (spherical), Bacillus (rod-shaped), Vibrio (comma-shaped), and Spirillum (spiral-shaped).
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Key Topics to Revise

1

Bacteria: General Features

  • Bacteria are unicellular prokaryotes without a true nucleus and no chlorophyll.
  • Bacterial cells are very small, about 2 micrometres long and 0.5 micrometre thick.
  • The bacterial cell wall is made of peptidoglycan, not cellulose.
2

Useful Role of Bacteria in Medicine

  • Bacteria are used in medicine to produce antibiotics, serums, vaccines, and toxoids.
  • An antibiotic is a chemical substance produced by a living organism or living micro-organism that can stop the growth of some disease-producing micro-organisms.
  • A good antibiotic should be broad spectrum, should not produce undesirable side-effects, and should not kill normal bacteria of the host.
3

Useful Role of Bacteria in Agriculture

  • Rhizobium lives in root nodules of leguminous plants and converts free nitrogen into soluble nitrates.
  • Free living bacteria like Azotobacter and Clostridium convert free nitrogen of the soil into ammonia.
  • The ammonia is converted into amino acids and nitrates, enriching the soil.
4

Useful Role of Bacteria in Industry and Food

  • Different flavours of tea are produced by certain bacteria through tea curing.
  • Leather tanning involves bacteria breaking down the soft perishable parts of hide, along with sunlight.
  • Bacteria are also used in curing hides and skins.

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Full Notes

Key Concepts

Bacteria are unicellular prokaryotes withoutAn antibiotic is a chemical substancePenicillin was discovered by Alexander FlemingSerum is blood plasma fromRhizobium lives in root nodules

Frequently Asked Questions

What are the important topics in Economic Importance of Bacteria and Fungi for ICSE Class 9 Biology?
Economic Importance of Bacteria and Fungi covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Economic Importance of Bacteria and Fungi — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 42 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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