Biological Classification – NCERT Quick Revision with Examples for NEET 2025

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Biological Classification – NCERT Quick Revision with Examples for NEET 2026

Biological Classification – NCERT Quick Revision with Examples for NEET 2026

“Biological Classification” is a foundational chapter that appears frequently in NEET Biology. Understanding the 5 Kingdom System, its features, and NCERT-based examples is crucial. Let’s revise the topic with important tables and mnemonics.

1. Need for Biological Classification

  • Over 1.7 million species discovered.
  • Classification helps in systematic study, identifying relationships, and easier naming.

2. Types of Classification Systems

  • Two Kingdom System – Proposed by Linnaeus (Plantae & Animalia). Lacked separation of prokaryotes, fungi, etc.
  • Five Kingdom System – Proposed by R.H. Whittaker (1969). Based on:
    • Cell type (prokaryotic/eukaryotic)
    • Body organization (unicellular/multicellular)
    • Mode of nutrition
    • Reproduction
    • Phylogenetic relationships

3. The Five Kingdoms – Overview Table

KingdomCell TypeNutritionExamples
MoneraProkaryoticAutotrophic/HeterotrophicBacteria, Cyanobacteria
ProtistaEukaryoticMixotrophicAmoeba, Paramecium
FungiEukaryoticSaprophyticYeast, Rhizopus
PlantaeEukaryoticAutotrophicFern, Mango
AnimaliaEukaryoticHeterotrophicMan, Dog, Hydra

4. Kingdom Monera (Bacteria)

  • Types of Bacteria: Cocci, Bacilli, Spirilla, Vibrio
  • Nutrition: Autotrophs (e.g. Cyanobacteria), Heterotrophs (Saprophytic, Parasitic)
  • Special Concepts:
    • Mycoplasma – No cell wall
    • Archaebacteria – Extreme habitats (Halophiles, Thermoacidophiles, Methanogens)

5. Kingdom Protista

All are unicellular eukaryotes. Include:

  • Chrysophytes – Diatoms (silica cell walls)
  • Dinoflagellates – Red tide (e.g. Gonyaulax)
  • Euglenoids – Euglena (mixotrophs)
  • Protozoans – Amoeba, Paramecium

Mnemonic: “Crazy Dinosaurs Eat Pies” = Chrysophytes, Dinoflagellates, Euglenoids, Protozoans

6. Kingdom Fungi

Nutrition: Heterotrophic (saprophytic/parasitic/symbiotic)

Save this post for quick NEET revision!

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