The Living World Class 11: NCERT Notes for NEET 2027
Introduction:
"The Living World" is the first chapter of NCERT Class 11 Biology, and it sets the stage for all other chapters. It’s a theory-based chapter, but NEET often asks direct questions from scientific terms, taxonomic categories, and binomial nomenclature.
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Explore NEET Biology →1. What is ‘Living’?
Living beings show:
Growth – Increase in mass and number (exception: sand mountain grows)
Reproduction – Sexual or asexual (exception: mule, sterile worker bees)
Metabolism – Sum of all biochemical reactions
Consciousness – Awareness to stimuli (definitive property of living organisms)
💡 NEET TIP: Metabolism is the most universal feature of living organisms.
2. Taxonomy & Systematics
Taxonomy: Study of classification, identification, nomenclature
Systematics: Study of diversity + evolutionary relationships
Term by Carl Linnaeus
Taxonomic Aids:
Herbarium: Store of dried, pressed plants
Botanical Garden: Cultivation of live plants
Museum: Preserved specimens
Keys: Based on similarities/differences
Flora, Manuals, Monographs: Info about plants in a region
3. Taxonomic Hierarchy (Ranks)
🧠 Mnemonic:
“King Philip Came Over For Good Soup”
= Kingdom → Phylum → Class → Order → Family → Genus → Species
4. Binomial Nomenclature
Proposed by Carl Linnaeus
Two-word scientific naming:
Genus + Species
e.g., Homo sapiens, Mangifera indica
✅ Rules (ICBN):
Italicized (typed) or underlined (handwritten)
Genus: Capitalized, Species: lowercase
Name in Latin
5. NCERT Examples to Memorize
Organism Genus Species
Mango Mangifera indica
Man Homo sapiens
Housefly Musca domestica
Wheat Triticum aestivum
6. NEET Favorite Keywords
Species: Basic unit of classification
Taxon: Group at any level (e.g., class Mammalia)
Classification: Arrangement in groups
Identification: Finding correct group
Quick Facts for NEET:
ICBN – International Code for Botanical Nomenclature
ICZN – Zoological Nomenclature
Linnaeus – Father of Taxonomy
Biological concept of species – Mayr
