Pearson Edexcel International GCSE (9-1) · Biology (4BI1)
IGCSE Biology revision videos
Short, calm videos covering every point of the Edexcel International GCSE Biology specification, grouped into the five sections below. The complete course is here — pick a section to start revising.
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1. The Nature & Variety of Living Organisms
Characteristics shared by all living organisms, the main groups of living things, and the pathogens that cause disease.
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2. Structure & Functions in Living Organisms
Cells, biological molecules, enzymes, transport, nutrition, respiration, gas exchange, circulation, excretion and coordination.
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3. Reproduction & Inheritance
Reproduction in plants and humans, then DNA, cell division, genetic inheritance, variation and natural selection.
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4. Ecology & the Environment
Energy and nutrients flowing through ecosystems, the carbon and nitrogen cycles, and the human impact on the environment.
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5. Use of Biological Resources
Producing food with crops, microorganisms and fish, plus selective breeding, genetic modification and cloning.
Biology revision app
Practise Biology and get it marked
275 guided topics across Biology, Chemistry and Physics, with questions marked as you answer them, section checkpoints and timed practice papers. Fifteen topics are free to try, with no card needed.