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.
Key Topics to Revise
Classification Basics and Species Concept
- Species: Organisms that can interbreed to produce fertile offspring (e.g., all humans belong to Homo sapiens)
- Classification hierarchy: Species → Genus → Family → Order → Class → Phylum → Kingdom
- Examples of interbreeding: Horse × Donkey = Mule (sterile), Tiger × Lion = Tigon (sterile)
Evolution from Two Kingdom to Five Kingdom System
- Old system (Linnaeus): Only Plantae and Animalia kingdoms
- Problems with old system: Bacteria have no chlorophyll but were called plants, Euglena has both plant and animal features
- Five Kingdom system solves these problems by creating separate kingdoms
Kingdom Monera - The Prokaryotes
- Includes all bacteria and blue-green bacteria (cyanobacteria)
- Single-celled organisms without organized nucleus
- No membrane-bound organelles like mitochondria or chloroplasts
Kingdom Protista - Single-celled Eukaryotes
- Single-celled organisms with organized nucleus (eukaryotic)
- Include both autotrophic (Chlamydomonas) and heterotrophic (Amoeba, Paramecium) forms
- Some can move (Amoeba with pseudopodia, Paramecium with cilia)
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