O-LEVEL / SEC · PURE BIOLOGY · SEAB K325 (2027) · 6093 (2026)

The whole of O-Level Biology, in one notebook.

All 14 SEAB syllabus topics, chapter by chapter. Every page is tied to the outcomes you are examined on, with labelled diagrams, memory tricks, the mistakes students actually make, and exam checks to prove you have it. The opening sections of every topic are free to read; unlock all 14 topics for $9 one-time (included with Premium).

Start with Topic 1 Jump to a topic

14syllabus topics

127learning outcomes

2×reviewed per chapter

Labelled diagram of the inside of the heart

Topic 5 · the heart

Labelled diagram of the human gas exchange system

Topic 6 · breathing

Topic 4 · a villus

Every diagram is labelled the way the mark scheme wants.

pick up where you left off

Four sections. Fourteen topics.

SYLLABUS 6093 (2026) / K325 (2027) TOPIC LIST

Tick outcomes inside each chapter and your progress shows here. It is saved on this device.

SECTION I · 13 OUTCOMES
Cells and the Chemistry of Life
1
Cell Structure and Organisation
0/4
2
Movement of Substances
0/3
3
Biological Molecules
0/6

SECTION II · 49 OUTCOMES
The Human Body: Maintaining Life
4
Nutrition in Humans
0/7
5
Transport in Humans
0/8
6
Respiration in Humans
0/7
7
Excretion in Humans
0/4
8
Homeostasis, Co-ordination and Response in Humans
0/14
9
Infectious Diseases in Humans
0/9

SECTION III · 23 OUTCOMES
Plants, Animals and Ecosystems
10
Nutrition and Transport in Flowering Plants
0/14
11
Organisms and their Environment
0/9

SECTION IV · 42 OUTCOMES
Continuity of Life
12
Molecular Genetics
0/8
13
Reproduction
0/21
14
Inheritance
0/13

real extracts from Topic 6

What is inside every chapter.

SGSK SHORTCUT

Lions Travel Barefoot, Bravely Alone

Larynx, Trachea, Bronchi, Bronchioles, Alveoli, in the order that air travels. The first B is the wider tubes, the second B the narrower ones.

COMMON MISTAKES

what loses the mark

Gaseous exchange takes place in the bronchi.

Gaseous exchange takes place in the alveoli; the trachea, bronchi and bronchioles only carry air to them.

The lungs are hollow bags full of air.

The lungs contain millions of alveoli, which gives them a large surface area.

Labelled diagram of an alveolus and its blood capillary

LABELLED DIAGRAMS

Tap any figure to enlarge it

EXAM CHECK · Q1

Which structure is the site of gaseous exchange?

A · Trachea

B · Bronchus

C · Bronchiole

D · Alveolus

BEYOND THE SYLLABUS · GOOD TO KNOW

The walls of the bronchioles have no cartilage, but they contain smooth muscle, which can narrow the airway, as happens during an asthma attack.

extra, never examined alone

How to use these notes

Read one topic

Each chapter opens with the SEAB outcomes it covers, so you always know why a page is there.

Pass the exam check

Answer the questions at the end of each section. Only tick an outcome once you can.

Come back and carry on

Your ticks are saved on your own device, and this page shows how far you have got.

Quick answers

Are these O-Level Biology notes free?

The opening sections of every topic are free to read online, no sign-in needed. Unlock all 14 topics for $9 one-time, with no subscription. It is included with Premium.

Is this the SEAB 6093 syllabus?

Yes. The notes cover all 14 topics of the SEAB O-Level Pure Biology syllabus, 6093 for 2026 and K325 for 2027, which use the same wording.

What is in each chapter?

Each chapter maps to the syllabus learning outcomes, with exam checks and the common mistakes students make.

Is my progress saved?

Your ticks are saved on your own device, and the topic list on this page shows how far you have got.

Notes version 1.0 · Last updated 30 Sept 2026