Welcome to Biology!
Biology is the science of life and living things.
Look around you right now. How many living things can you see?
- Plants in pots
- Insects flying
- Birds on trees
- Your pets
- You!
All of these are living organisms.
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1. The Living World
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Part of NCERT 11 Biology
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Last updated Dec 12, 2025. Clone to remix or explore the blocks below.
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prerequisite
Quick Ready Check
Let's see what you already know
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Before You Start: Do You Know These?
I can name 5 different plants I see around me
I can name 5 different animals I know
I know that different organisms have different features
I understand that scientists organize information into groups
I have heard the term 'species' before
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overview
Why Study 'The Living World'?
Understanding life's diversity and how we make sense of it
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vocabulary
Vocabulary: The Living World
12 key terms you need to know
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concept
Naming Living Things
From local names to universal scientific names
The Problem with Local Names
In India alone, mango has different names:
- Hindi: Aam
- Tamil: Maangai
- Bengali: Aam
- Malayalam: Maanga
- Kannada: Mavina hannu
Now imagine scientists from different countries trying to discuss this fruit!
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images
Anatomy of a Scientific Name
Visual guide to binomial nomenclature
Click to zoom
Notice the pattern: First word capitalized, second word lowercase, both in italics
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concept
Classification & Taxonomy
Understanding the science of organizing life
What is Classification?
You already classify things every day!
- Your wardrobe: shirts, pants, shoes
- Your phone: contacts, photos, apps
- Your mind: friends, family, teachers
Classification = Grouping things based on similarities
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quiz
Check: Naming & Basics
Test your understanding of nomenclature and basic concepts
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In the name Homo sapiens, which word represents the genus?
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concept
The Taxonomic Hierarchy
From species to kingdom - understanding the ranks
Understanding the Hierarchy
A hierarchy is a system of ranking things from lowest to highest.
Example: In school
- Student → Class → Grade → School → Education Board
In military:
- Soldier → Sergeant → Captain → General
Each level is broader than the one below it.
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images
The Classification Ladder
Visual representation of taxonomic ranks
Click to zoom
Bottom = Most specific (species). Top = Most general (kingdom). Going up means fewer shared characteristics.
Click to zoom
See how each level groups humans with more and more organisms
Click to zoom
Plants use 'Division' instead of 'Phylum', but the principle is the same
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terms
Know Your Ranks
Master the seven taxonomic categories
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practice
Active Recall Practice
Test your memory of key terms and concepts
Fill in the blanks with appropriate terms. Use NO MORE THAN TWO WORDS for each blank.
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The system of giving scientific names to organisms is called0/1. This two-word naming system is known as0/2and was introduced by0/2. In a scientific name like Mangifera indica, the first word represents the0/1and the second word is the specific0/1. The process of grouping organisms based on similarities is called0/1. The science that deals with identification, nomenclature, and classification is called0/1. The seven major ranks in classification, from most specific to most general, are: Species, Genus, Family, Order, Class, Phylum (or Division for plants), and0/1.
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assessment
Assessment: Taxonomy
Comprehensive test covering all concepts from class XI NCERT Biology: The Living World
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Which taxonomic category has the maximum number of common characteristics among its members?