Explore key GCSE Biology topics, from cells and organisation to inheritance, evolution and ecosystems. Choose a topic area below, then select the page you want to study or revise.
Cell Biology
Cells are the fundamental units of life. Explore their structures, functions, division and movement of substances.
Infection and Response
Discover how pathogens cause disease and how the body, medicines and vaccines help protect us.
Organisation
Explore how cells form tissues, organs and organ systems, including digestion, circulation, health and plant transport.
Bioenergetics
Explore how organisms transfer energy through photosynthesis and respiration.
Homeostasis and Response
Understand how the nervous and endocrine systems coordinate responses and maintain stable internal conditions.
Inheritance, Variation and Evolution
Explore DNA, reproduction, inheritance, variation and the processes that drive evolutionary change.
Ecology
Investigate interactions within ecosystems, biodiversity, environmental change and practical methods used by ecologists.