Biology
Cambridge O Levels · Code: 5090
Cell Structure
Exploring cells, the fundamental units of life, and their specialised structures.
Nutrition & Enzymes
The breakdown and absorption of food, powered by biological catalysts called enzymes.
Ecology & Environment
Explores organism interactions, energy flow, nutrient cycles, and human environmental impact.
Human Body Systems
The structure and function of the circulatory, digestive, and respiratory systems.
Reproduction & Genetics
Cell division, inheritance, and the mechanisms of sexual and asexual reproduction.
Disease & Immunity
Explores how pathogens cause disease and how the body's immune system and medicine fight back.
Transport in Humans
Explores the human circulatory system, including the heart, blood vessels, and blood.
Scientific Enquiry and Practical Skills
Mastering the scientific method, from hypothesis to conclusion, for practical biology.
Cell Division & Genetics
Mitosis, meiosis, chromosomes, genes and inheritance patterns
Evolution & Biodiversity
Natural selection, adaptation, classification and species variation
Human Physiology — Circulation
The circulatory system, heart structure, blood components and transport
Plant Biology & Photosynthesis
Photosynthesis, plant cells, transport in plants, tropisms
Excretion and the Kidney
Understand how your body removes harmful metabolic waste through the incredible filtration system of your kidneys and the process of urine formation.
Coordination and Response
Master how your body's nervous and hormonal systems work together to react to the world, and how plants respond to their environment.
Excretion and the Kidney
Master how your body cleans its blood, forms urine, and maintains water balance, a vital topic for scoring high in your O Level Biology exam.
Coordination and Response
This topic explains how your body's nervous and hormonal systems work together to detect changes and react, from a quick reflex to controlling your blood sugar, and how plants respond to their environment.