clqbl

Continuity & Change SL

by
Continuity & Change | Biology SL 2025
BIOLOGY SL 2025

Continuity & Change

Evolution and Genetics
Explore how life maintains continuity through reproduction and inheritance while adapting through evolution and natural selection.

🧬 Choose Your Topic

Select a topic below to access comprehensive study materials

🧬

Genetic Information & Processes

Study DNA replication, protein synthesis, and cellular division processes in biological systems.

DNA Replication Protein Synthesis Cell & Nuclear Division
PDF
DNA Replication
PDF
Protein Synthesis
PDF
Cell & Nuclear Division
👨‍👩‍👧‍👦

Inheritance & Reproduction

Understand how traits are passed from generation to generation through reproduction and inheritance patterns.

Reproduction Inheritance
PDF
Reproduction
PDF
Inheritance
🌿

Evolution & Environmental Change

Explore how species evolve through natural selection and adapt to environmental challenges like climate change.

Natural Selection Climate Change
PDF
Natural Selection
PDF
Climate Change
⚖️

Stability & Regulation

Study how organisms maintain internal balance and stability while adapting to changing conditions.

Homeostasis Water Potential Stability & Change
PDF
Homeostasis
PDF
Water Potential
PDF
Stability & Change

📊 Biology SL 2025 Overview

Complete collection of Continuity & Change materials for Standard Level

10
PDF Resources
4
Topic Categories
SL
Standard Level
2025
Curriculum

💡 Key Concepts

Understanding how life maintains continuity while adapting to change

🔄

Genetic Continuity

How genetic information is faithfully replicated and passed to offspring

🧬

DNA & Protein Synthesis

The central dogma of molecular biology from DNA to proteins

🌱

Evolution by Natural Selection

How populations change over time through differential survival and reproduction

⚖️

Dynamic Equilibrium

How organisms maintain stability while adapting to environmental changes

Test

by
A2. Cells | IB Biology
THEME A

A2. Cells

The Building Blocks of Life
Explore the fundamental units of life – from the origins of cellular life to complex cellular structures and the unique characteristics of viruses.

🌱 A2.1 Origins of Cells

Study how life began on Earth and how the first cells evolved from simple organic molecules to complex cellular structures.

Jump to A2.1 Materials → HL

🔬 A2.2 Cell Structure

Examine the intricate organization of prokaryotic and eukaryotic cells, their organelles, and specialized structures.

Jump to A2.2 Materials → SL+HL

🦠 A2.3 Viruses

Investigate the unique characteristics of viruses, their replication cycles, and their relationship with host cells.

Jump to A2.3 Materials → HL
🌱

A2.1 Origins of Cells

PDF

A2.1 Origins of Cells (HL) – 20 marks

HL

📖 View the PDF above or open in a new tab for better reading

View PDF 1
🔬

A2.2 Cell Structure

PDF

A2.2 Cell Structure (SL) – 20 marks

SL

📖 View the PDF above or open in a new tab for better reading

View PDF 2
PDF

A2.2 Cell Structure (HL) – Biology Assessment

HL

📖 View the PDF above or open in a new tab for better reading

View PDF 3
🦠

A2.3 Viruses

PDF

A2.3 Viruses (HL) – 20 marks

HL

📖 View the PDF above or open in a new tab for better reading

View PDF 4

C2

by
A2. Cells | IB Biology
THEME A

A2. Cells

The Building Blocks of Life
Explore the fundamental units of life – from the origins of cellular life to complex cellular structures and the unique characteristics of viruses.

🔬 Choose Your Topic

Select a cell biology topic below to access comprehensive study materials

🌱

A2.1 Origins of Cells

Study how life began on Earth and how the first cells evolved from simple organic molecules to complex cellular structures.

Evolution of Life First Cells Endosymbiotic Theory Prokaryote to Eukaryote
Jump to A2.1 Materials →
HL
🔬

A2.2 Cell Structure

Examine the intricate organization of prokaryotic and eukaryotic cells, their organelles, and specialized structures.

Prokaryotes Eukaryotes Organelles Cell Membranes
Jump to A2.2 Materials →
SL+HL
🦠

A2.3 Viruses

Investigate the unique characteristics of viruses, their replication cycles, and their relationship with host cells.

Viral Structure Replication Cycles Host-Pathogen Interactions Non-cellular Life
Jump to A2.3 Materials →
HL

📊 A2. Cells Overview

Complete collection of cell biology materials

4
PDF Resources
3
Topic Areas
SL+HL
All Levels
2025
Curriculum
🌱

A2.1 Origins of Cells

PDF

A2.1 Origins of Cells (HL) – 20 marks

HL

📖 View the PDF above or open in a new tab for better reading

View PDF 1
🔬

A2.2 Cell Structure

PDF

A2.2 Cell Structure (SL) – 20 marks

SL

📖 View the PDF above or open in a new tab for better reading

View PDF 2
PDF

A2.2 Cell Structure (HL) – Biology Assessment

HL

📖 View the PDF above or open in a new tab for better reading

View PDF 3
🦠

A2.3 Viruses

PDF

A2.3 Viruses (HL) – 20 marks

HL

📖 View the PDF above or open in a new tab for better reading

View PDF 4

🔬 Cell Types & Organization

Understanding the diversity and complexity of cellular life

🦠

Prokaryotic Cells

✓ No nucleus
✓ Circular DNA
✓ Simple organelles
✓ Rapid reproduction
Examples: Bacteria, Archaea
🔬

Eukaryotic Cells

✓ Membrane-bound nucleus
✓ Linear DNA
✓ Complex organelles
✓ Compartmentalization
Examples: Animals, Plants, Fungi
🦠

Viruses

✗ Not technically cells
✓ Genetic material
✓ Protein coat
✗ Require host cells
Examples: Influenza, HIV, COVID-19

🌍 Evolution of Cellular Life

The journey from simple molecules to complex cellular organisms

⚗️

4.6 Billion Years Ago

Earth Formation

Early Earth with hostile conditions, volcanic activity, and no oxygen atmosphere

🧪

4.0 Billion Years Ago

Organic Molecules

Formation of amino acids, nucleotides, and other organic building blocks

🦠

3.8 Billion Years Ago

First Prokaryotes

Simple bacterial cells with basic metabolic processes

☀️

2.5 Billion Years Ago

Photosynthesis

Cyanobacteria begin producing oxygen, changing Earth’s atmosphere

🔬

1.8 Billion Years Ago

First Eukaryotes

Complex cells with nuclei and organelles through endosymbiosis

🌱

1.0 Billion Years Ago

Multicellular Life

First multicellular organisms leading to complex life forms

Unity & Diversity

by
Unity & Diversity | IB Biology
IB BIOLOGY

Unity & Diversity

Common Origins, Endless Variety
Discover how all life shares fundamental principles while expressing incredible diversity through evolution, cellular structures, and biological classification.

🌊 Choose Your Topic

Select a topic below to access comprehensive study materials

💧

Fundamental Life Processes

Study the basic building blocks and processes that unite all living organisms.

Water Nucleic Acids Origins of Cells Cell Structure
PDF
Water
PDF
Nucleic Acids
PDF
Origins of Cells
PDF
Cell Structure
🦋

Biological Diversity

Explore the incredible variety of life forms and how scientists organize and classify them.

Diversity of Organisms Classification Cladistics Viruses
PDF
Diversity of Organisms
PDF
Classification & Cladistics
PDF
Viruses
🌿

Evolution & Conservation

Understand how diversity arose through evolution and how we protect biodiversity today.

Evolution Speciation Conservation Biodiversity
PDF
Evolution & Speciation
PDF
Conservation of Biodiversity

📊 Unity & Diversity Overview

Complete collection of foundational biology materials

9
PDF Resources
3
Topic Categories
HL
Higher Level
2025
Curriculum

⚖️ Unity vs Diversity in Biology

Understanding how life maintains common principles while expressing endless variety

🔗 Unity – What Connects All Life

💧
Water as Universal Solvent

All life depends on water’s unique properties

🧬
DNA & RNA Information Storage

Universal genetic code across all organisms

🔬
Cellular Organization

All life is made of cells with membranes

⚡
Energy Metabolism

Similar biochemical pathways in all organisms

🌈 Diversity – What Makes Life Unique

🦠
Prokaryotes vs Eukaryotes

Different cellular organizations and complexity

🌱
Autotrophs vs Heterotrophs

Different strategies for obtaining energy

🧪
Specialization & Adaptation

Organisms adapt to specific environments

🔄
Evolutionary Divergence

Common ancestors lead to different lineages

🏛️ Biological Classification

How we organize life’s diversity from broad categories to specific species

Domain
Bacteria, Archaea, Eukarya
Kingdom
Animalia, Plantae, Fungi, etc.
Phylum
Chordata, Arthropoda, etc.
Class
Mammalia, Insecta, etc.
Order
Primates, Lepidoptera, etc.
Family
Hominidae, Felidae, etc.
Genus
Homo, Felis, etc.
Species
sapiens, catus, etc.

Interaction & Interdependence

by
Interaction & Interdependence | IB Biology
IB BIOLOGY

Interaction & Interdependence

Connected Systems
Explore how organisms interact with each other and their environment through metabolic processes, signalling systems, and ecological relationships.

🌿 Choose Your Topic

Select a topic below to access comprehensive study materials

⚡

Energy & Metabolism

Study the fundamental processes of energy conversion and metabolic pathways that sustain life.

Photosynthesis Cell Respiration Enzymes & Metabolism Energy Transfer
PDF
Photosynthesis
PDF
Cell Respiration
PDF
Enzymes & Metabolism
PDF
Transfer of Energy & Matter
📡

Communication & Signalling

Understand how organisms communicate through chemical and neural signalling systems.

Neural Signalling Chemical Signalling System Integration Defense Systems
PDF
Neural Signalling
PDF
Chemical Signalling
PDF
Integration of Body Systems
PDF
Defence Against Disease
🌍

Ecological Interactions

Explore how populations and communities interact within ecosystems and environmental networks.

Populations Communities Ecosystem Dynamics
PDF
Populations & Communities

📊 Interaction & Interdependence Overview

Complete collection of biological interaction materials

9
PDF Resources
3
Topic Categories
HL
Higher Level
2025
Curriculum

🔄 Key Biological Processes

Understanding how organisms interact through fundamental life processes

☀️

Energy Flow

From photosynthesis to respiration, energy moves through living systems

💬

Information Transfer

Chemical and electrical signals coordinate biological functions

🔗

System Integration

Multiple systems work together to maintain life and respond to change

🛡️

Defense Mechanisms

Organisms protect themselves through immune and behavioral responses

🌱

Population Dynamics

Species interact within communities and shape ecosystem structure

⚗️

Metabolic Networks

Enzymatic pathways connect to form complex biochemical networks

🌐 System Connections

How biological systems connect and depend on each other

1

Molecular Level

Enzymes catalyze metabolic reactions

→
2

Cellular Level

Cells communicate through signaling

→
3

Organism Level

Systems integrate for homeostasis

→
4

Ecosystem Level

Communities interact and exchange energy

Form & Function

by
Form & Function | IB Biology
IB BIOLOGY

Form & Function

Structure and Process
Explore how biological structures are perfectly adapted to their functions – from molecular transport to muscle movement and environmental adaptation.

🔬 Choose Your Topic

Select a topic below to access comprehensive study materials

🧬

Molecular & Cellular Structure

Study the fundamental building blocks of life – proteins, carbohydrates, lipids, and cellular organization.

Proteins Carbohydrates & Lipids Organelles Cell Specialisation
PDF
Proteins
PDF
Carbohydrates & Lipids
PDF
Organelles & Compartmentalisation
PDF
Cell Specialisation
🚀

Transport & Movement

Understand how substances move through biological systems and how organisms achieve motion.

Transport Systems Membrane Transport Muscle & Motility Gas Exchange
PDF
Transport
PDF
Membranes & Membrane Transport
PDF
Muscle & Motility
PDF
Gas Exchange
🌍

Environmental Interactions

Explore how organisms adapt to their environments and find their ecological niches.

Environmental Adaptation Ecological Niches
PDF
Adaptation to Environment
PDF
Ecological Niches

📊 Form & Function Overview

Complete collection of structural and functional biology materials

10
PDF Resources
3
Topic Categories
HL
Higher Level
2025
Curriculum

💡 Key Concepts

Understanding how structure relates to function in biological systems

🔗

Structure-Function Relationship

Every biological structure is perfectly adapted to perform its specific function

⚖️

Surface Area to Volume

Size and shape optimizations for efficient transport and exchange

🌊

Transport Mechanisms

Passive and active processes that move substances across membranes

🎯

Specialization

How cells and organisms become specialized for specific roles

Continuity & Change

by
Continuity & Change | IB Biology
IB BIOLOGY

Continuity & Change

Stability Through Adaptation
Explore how biological systems maintain stability while adapting to change through homeostasis, reproduction, evolution, and genetic mechanisms.

🔄 Choose Your Topic

Select a topic below to access comprehensive study materials

🧬

Genetic Continuity & Change

Study how genetic information is maintained and modified across generations through replication, expression, and mutation.

DNA Replication Gene Expression Protein Synthesis Mutations & Gene Editing
PDF
DNA Replication
PDF
Gene Expression
PDF
Protein Synthesis
PDF
Mutations & Gene Editing
🌱

Evolutionary Change

Understand how populations change over time through natural selection, inheritance, and reproductive strategies.

Natural Selection Inheritance Reproduction Cell Division
PDF
Natural Selection
PDF
Inheritance
PDF
Reproduction
PDF
Cell & Nuclear Division
⚖️

Stability & Homeostasis

Explore how organisms maintain internal stability while responding to environmental changes and challenges.

Homeostasis Stability & Change Water Potential Climate Change
PDF
Homeostasis
PDF
Stability & Change
PDF
Water Potential
PDF
Climate Change

📊 Continuity & Change Overview

Complete collection of stability and adaptation materials

12
PDF Resources
3
Topic Categories
HL
Higher Level
2025
Curriculum

🔄 The Balance of Life

Understanding how biological systems maintain stability while enabling change

🔒 Continuity – What Stays Stable

🧬
DNA Structure

Double helix maintains genetic information integrity

🏠
Homeostasis

Internal conditions maintained within narrow ranges

👨‍👩‍👧‍👦
Heredity

Traits passed reliably from parents to offspring

🔄
Cell Cycle Control

Precise regulation ensures proper cell division

🌊 Change – What Drives Adaptation

⚡
Mutations

DNA changes create genetic variation for selection

🎯
Natural Selection

Environmental pressures drive evolutionary change

🎭
Gene Expression

Cells change which genes are active in response to signals

🌡️
Environmental Response

Organisms adjust to changing external conditions

⏱️ Timescales of Biological Change

From seconds to millennia – how biological systems respond to change

⚡

Seconds to Minutes

Enzyme Activity – Immediate responses to cellular conditions

Nerve Impulses – Rapid communication and responses

🔬

Hours to Days

Gene Expression – Cells adjust protein production

Homeostatic Regulation – Maintaining internal balance

🌱

Weeks to Years

Development & Growth – Individual organism changes

Seasonal Adaptations – Cyclical environmental responses

🧬

Generations

Genetic Inheritance – Traits passed to offspring

Population Changes – Allele frequencies shift

🦕

Millennia & Beyond

Evolution – Speciation and major adaptations

Climate Change – Long-term environmental shifts

THEME B

B1. Molecules

Form and Function
Explore the fundamental biological molecules – from energy-storing carbohydrates and structural lipids to the versatile proteins that perform countless cellular functions.
🍬

B1.1 Carbohydrates and Lipids

SLIDES

B1.1 Carbohydrates and Lipids (SL) – Presentation Slides

SL

💡 Use arrow keys or click to navigate slides

View Slides 1
QUIZ

B1.1 Carbohydrates and Lipids (SL) – End of Topic Quiz (20 marks)

SL

📝 Complete the quiz above and submit your answers

Take Quiz 2
DOC

B1.1 Carbohydrates and Lipids (SL) – Workbook

SL

📖 Questions and answers workbook for Standard Level students

View Workbook 3
🧪

B1.2 Proteins

SLIDES

B1.2 Proteins (SL) – Presentation Slides

SL

💡 Use arrow keys or click to navigate slides

View Slides 4
QUIZ

B1.2 Proteins (SL) – End of Topic Quiz (20 marks)

SL

📝 Complete the quiz above and submit your answers

Take Quiz 5
SLIDES

B1.2 Proteins (HL) – Presentation Slides

HL

💡 Use arrow keys or click to navigate slides

View Slides 6
QUIZ

B1.2 Proteins (HL) – End of Topic Quiz (20 marks)

HL

📝 Complete the quiz above and submit your answers

Take Quiz 7
📚

Shared Materials (Standard + Higher Level)

DOC

B1.2 Proteins – Workbook (STANDARD + HIGHER LEVEL)

SL+HL

📖 Questions and answers workbook for both Standard and Higher Level students

View Workbook 8

A1

by
A1. Molecules | IB Biology
THEME A

A1. Molecules

Unity and Diversity
Explore the fundamental molecules that form the basis of all life – from the essential properties of water to the complex structures of nucleic acids.
💧

A1.1 Water

SLIDES

A1.1 Water (SL) – Presentation Slides

SL

💡 Use arrow keys or click to navigate slides

View Slides 1
QUIZ

A1.1 Water (SL) – End of Topic Quiz (20 marks)

SL

📝 Complete the quiz above and submit your answers

Take Quiz 2
SLIDES

A1.1 Water (HL) – Presentation Slides

HL

💡 Use arrow keys or click to navigate slides

View Slides 3
QUIZ

A1.1 Water (HL) – End of Topic Quiz (10 marks)

HL

📝 Complete the quiz above and submit your answers

Take Quiz 4
📚

Shared Materials (Standard + Higher Level)

DOC

A1.1 Water – Workbook (STANDARD + HIGHER LEVEL)

SL+HL

📖 Questions and answers workbook for both Standard and Higher Level students

View Workbook 5
🧬

A1.2 Nucleic Acids

SLIDES

A1.2 Nucleic Acids (SL) – Presentation Slides

SL

💡 Use arrow keys or click to navigate slides

View Slides 6
QUIZ

A1.2 Nucleic Acids (SL) – End of Topic Quiz (20 marks)

SL

📝 Complete the quiz above and submit your answers

Take Quiz 7
SLIDES

A1.2 Nucleic Acids (HL) – Presentation Slides

HL

💡 Use arrow keys or click to navigate slides

View Slides 8
QUIZ

A1.2 Nucleic Acids (HL) – End of Topic Quiz (20 marks)

HL

📝 Complete the assessment above and submit your answers

Take Quiz 9
📚

Shared Materials (Standard + Higher Level)

DOC

A1.2 Nucleic Acids – Workbook (STANDARD + HIGHER LEVEL)

SL+HL

📖 Questions and answers workbook for both Standard and Higher Level students

View Workbook 10

Powered by
►
Necessary cookies enable essential site features like secure log-ins and consent preference adjustments. They do not store personal data.
None
►
Functional cookies support features like content sharing on social media, collecting feedback, and enabling third-party tools.
None
►
Analytical cookies track visitor interactions, providing insights on metrics like visitor count, bounce rate, and traffic sources.
None
►
Advertisement cookies deliver personalized ads based on your previous visits and analyze the effectiveness of ad campaigns.
None
Powered by