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Five Kingdom Classification

ICSE · Class 9 · Biology

Quick revision notes for Five Kingdom Classification — ICSE Class 9 Biology. Key concepts, formulas, and definitions for last-minute revision.

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An infographic summarizing the universal rules of binomial nomenclature, including Latin origin, italicization/underlining, capitalization of genus, lowercase for species, and author citation, with ex
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Key Topics to Revise

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1. Levels of Classification

  • The taxonomic hierarchy from highest to lowest is: Kingdom → Phylum → Class → Order → Family → Genus → Species.
  • Species is the lowest category and kingdom is the largest division of living beings.
  • All individuals of a species can normally interbreed among themselves.
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2. Species and Scientific Naming

  • Species means an organism of a particular kind whose members can interbreed among themselves to produce fertile young ones.
  • All house cats belong to one species: Felis domesticus.
  • All mankind belongs to one species: Homo sapiens.
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3. Drawbacks of the Old Two-Kingdom Classification

  • The old classification divided living organisms into Plantae and Animalia.
  • Bacteria and fungi are not plants because they have no chlorophyll and do not carry out photosynthesis.
  • Some unicellular organisms such as Euglena cannot be called only plant or only animal.
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4. The Five Kingdoms

  • The five kingdoms are Monera, Protista, Fungi, Plantae and Animalia.
  • Monera organisms are unicellular and prokaryotic.
  • Monera have no organized nucleus and no membrane-bound organelles.

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Full Notes

Key Concepts

Species is the lowest basic categoryThe category levels of diversityLinnaeus divided living organisms into PlantaeMonera includes unicellular prokaryotic organismsProtista includes unicellular eukaryotic organisms

Frequently Asked Questions

What are the important topics in Five Kingdom Classification for ICSE Class 9 Biology?
Five Kingdom Classification 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 Five Kingdom Classification — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 41 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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