IB Biology HL
Key Concepts

In the IB Biology HL (Higher Level) Key Concepts section, you will find summary videos that will help you review the most important concepts and skills necessary for success. They are ideal for a quick refresher before tackling questions in the Revision Village Questionbank or Practice Exams sections of the website.

You can now access audio versions of Key Concepts on the Revision Village Podcast

Theme A

Unity and Diversity

Theme A

Unity and Diversity

Water

15 mins

Nucleic Acids

13 mins

Cell Structure and Function

11 mins

Viruses

14 mins

Diversity of Organisms

25 mins

Evolution and Speciation

14 mins

Theme A

Unity and Diversity

Water

15 mins

Nucleic Acids

13 mins

Cell Structure and Function

11 mins

Viruses

14 mins

Diversity of Organisms

25 mins

Evolution and Speciation

14 mins

Theme B

Form and Function

Theme B

Form and Function

Carbohydrates and Lipids

12 mins

Structure and Function of Proteins

18 mins

Membrane Structure

10 mins

Membrane Transport

9 mins

Membranes: Structure & Transport - HL

12 mins

Organelles and Compartmentalisation

11 mins

Cell Specialisation

15 mins

Organelle Function and the Ultracentrifuge

2 mins

The Respiratory System

10 mins

The Cardiovascular System

22 mins

Plant Transport

17 mins

Muscle and Motility II

10 mins

Muscle and Motility I

7 mins

Adaptations to environment

18 mins

Ecological Niches

16 mins

Theme B

Form and Function

Carbohydrates and Lipids

12 mins

Structure and Function of Proteins

18 mins

Membrane Structure

10 mins

Membrane Transport

9 mins

Membranes: Structure & Transport - HL

12 mins

Organelles and Compartmentalisation

11 mins

Cell Specialisation

15 mins

Organelle Function and the Ultracentrifuge

2 mins

The Respiratory System

10 mins

The Cardiovascular System

22 mins

Plant Transport

17 mins

Muscle and Motility II

10 mins

Muscle and Motility I

7 mins

Adaptations to environment

18 mins

Ecological Niches

16 mins

Theme C

Interaction and Interdependence

Theme C

Interaction and Interdependence

Enzymes

11 mins

Cellular Respiration

12 mins

Cellular Respiration [HL]

12 mins

Photosynthesis

14 mins

Photosynthesis HL

14 mins

The Electron Transport Chain and Chemiosmosis

8 mins

Carbon Dioxide Enrichment Experiments

3 mins

Neural Signaling - Impulse

10 mins

Neural Signaling - Synapse

7 mins

Defense Against Disease - Part 1

6 mins

Defense Against Disease - Part 2

9 mins

Populations & Communities - Part 1 - Concepts

12 mins

Populations and Communities - Quantitative Ecology - Part 2

13 mins

Energy in Ecosystems

8 mins

Carbon Cycle

11 mins

Theme C

Interaction and Interdependence

Enzymes

11 mins

Cellular Respiration

12 mins

Cellular Respiration [HL]

12 mins

Photosynthesis

14 mins

Photosynthesis HL

14 mins

The Electron Transport Chain and Chemiosmosis

8 mins

Carbon Dioxide Enrichment Experiments

3 mins

Neural Signaling - Impulse

10 mins

Neural Signaling - Synapse

7 mins

Defense Against Disease - Part 1

6 mins

Defense Against Disease - Part 2

9 mins

Populations & Communities - Part 1 - Concepts

12 mins

Populations and Communities - Quantitative Ecology - Part 2

13 mins

Energy in Ecosystems

8 mins

Carbon Cycle

11 mins

Theme D

Continuity and Change

Theme D

Continuity and Change

DNA Replication

9 mins

Protein Synthesis

9 mins

Codons, Degeneracy, and Sickle Cell

10 mins

Mitosis, Cytokinesis & The Cell Cycle

18 mins

Cell Cycle - Mutagens & Cancer

9 mins

Gene Expression

19 mins

Water Potential

11 mins

Homeostasis, Hormones and the Menstrual Cycle

10 mins

Animal Reproduction

12 mins

Pregnancy Testing by hCG Detection

2 mins

Reproduction in Flowering Plants

10 mins

Inheritance

16 mins

Mendelian Genetics

7 mins

Homeostasis

11 mins

Thermoregulation

2 mins

Osmoregulation and Excretion

16 mins

Natural Selection

13 mins

Climate Change

15 mins

Theme D

Continuity and Change

DNA Replication

9 mins

Protein Synthesis

9 mins

Codons, Degeneracy, and Sickle Cell

10 mins

Mitosis, Cytokinesis & The Cell Cycle

18 mins

Cell Cycle - Mutagens & Cancer

9 mins

Gene Expression

19 mins

Water Potential

11 mins

Homeostasis, Hormones and the Menstrual Cycle

10 mins

Animal Reproduction

12 mins

Pregnancy Testing by hCG Detection

2 mins

Reproduction in Flowering Plants

10 mins

Inheritance

16 mins

Mendelian Genetics

7 mins

Homeostasis

11 mins

Thermoregulation

2 mins

Osmoregulation and Excretion

16 mins

Natural Selection

13 mins

Climate Change

15 mins

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More IB Biology HL Resources

Questionbank

All the questions you could need! Sorted by topic and arranged by difficulty, with mark schemes and video solutions for every question.

Data-based Questions

Original data-based questions to develop skills in analysing trends, evaluating data, and applying biological concepts in preparation for Paper 2.

Practice Exam

Practice exams refine your revision - use quizzes for key concepts, the Revision Ladder for challenge, and full mock exams to simulate the real exam.

Key Concepts

Helpful refreshers summarizing exactly what you need to know about the most important concepts covered in the course.

Past Papers

Full worked solutions to all past paper questions, taught by experienced IB instructors.

Internal Assessment (IA)

In the IB Biology HL Internal Assessment Bootcamp, you will find resources designed around the most important concepts, techniques, and skills required for success in your IA, created by experienced teachers and examiners.

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Flashcards

Use multiple-choice questions and study crucial terminology on desktop or mobile app to improve your marks!

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Frequently Asked Questions

What are the Biology HL Key Concepts?

The IB Biology Higher Leve Key Concepts section is one of the five main features available on Revision Village for Biology HL students, alongside the Questionbank, Data-based Questions, Practice Exams, and Past Papers. The Key Concepts section offers a carefully curated set of Biology HL exam revision videos designed to help students review specific concepts, such as “The Cardiovascular System”, that they may have missed or misunderstood in class. Each video is typically 10 to 15 minutes long, providing a concise and efficient way to reinforce key topics before applying knowledge through exam-style questions in the Questionbank, Data-based Questions, or Practice Exams sections of the Revision Village website.

How should I best use the Biology HL Key Concepts?

A great way to improve in IB Higher Level Biology is through consistent practice with exam-style questions. However, it’s easy to forget key concepts along the way. To reinforce understanding, students are encouraged to use the Biology HL Key Concept videos alongside their practice. Stuck on a specific question? Head to the Key Concepts section and watch a revision video that covers the relevant theory. Then, return to the original question and try solving it again with a fresh perspective.

Do the Biology HL Key Concept videos replace my textbook?

This is not the aim of the Biology Higher Level Key Concept section on Revision Village. These videos are short and concise and aim to ‘recap’ the theory, as opposed to teaching and explaining the theory, which is the purpose of textbooks. The goal of the Biology HL Key Concept section on Revision Village is to support students in their revision by offering a quick and effective way to review frequently tested topics in IB Biology Higher Level examinations.

Who are the teachers in the Biology HL Key Concept videos?

The Biology Higher Level Key Concept videos on Revision Village are taught by experienced IB Biology teachers and examiners, who are passionate about teaching IB Biology HL concepts in a simple, intuitive and engaging manner. The team is dedicated to helping each and every student achieve their best possible IB Biology grade.

IB Biology HLKey Concepts

Unity and Diversity

Unity and Diversity

Unity and Diversity

Form and Function

Form and Function

Form and Function

Interaction and Interdependence

Interaction and Interdependence

Interaction and Interdependence

Continuity and Change

Continuity and Change

Continuity and Change

#1 IB Math Resource

34% Grade Increase

80% of IB Students

More IB Biology HL Resources

Questionbank

Data-based Questions

Practice Exam

Key Concepts

Past Papers

Internal Assessment (IA)

Flashcards

What are the Biology HL Key Concepts?

How should I best use the Biology HL Key Concepts?

Do the Biology HL Key Concept videos replace my textbook?

Who are the teachers in the Biology HL Key Concept videos?

IB Biology HL
Key Concepts