GCSE-readyPearson Edexcel International GCSE Biology (4BI1)
69 free lessons that follow the International GCSE specification topic by topic. Each lesson has short notes, a worked example and a quick check with instant marking.
International GCSE · Pearson Edexcel 4BI1
Getting started
4 lessons · about 55 minutes
1 The nature and variety of living organisms
2 lessons · about 29 minutes
2(a) to (d) Cells, biological molecules and movement of substances
8 lessons · about 2 h
- Levels of organisation and cell structure 14 min
- Animal, plant and bacterial cells · video 15 min
- Stem cells · video 14 min
- Biological molecules and food tests 15 min
- Enzymes · video 16 min
- Investigating enzymes: temperature and pH 14 min
- Diffusion, osmosis and active transport · video 16 min
- Core practical: osmosis in potato 16 min
2(e) to (f) Nutrition and respiration
7 lessons · about 1 h 50 min
2(g) to (h) Gas exchange and transport
10 lessons · about 2 h 30 min
- Gas exchange in leaves 15 min
- Exchange surfaces and the lungs · video 15 min
- Breathing, the thorax and smoking 16 min
- Why we need transport systems: xylem and phloem 13 min
- Transport and water in plants · video 15 min
- Transpiration and the potometer 16 min
- Blood and the immune response 15 min
- Vaccination, memory cells and clotting 14 min
- The heart and blood · video 17 min
- Heart rate, heart disease and circulation 16 min
2(i) to (j) Excretion, co-ordination and response
8 lessons · about 1 h 55 min
- Excretion in plants and humans 12 min
- The kidney and ultrafiltration 16 min
- Reabsorption, ADH and urine 15 min
- Homeostasis and temperature control 14 min
- Plant hormones · video 14 min
- The nervous system and reflexes · video 16 min
- The eye: focusing and the pupil reflex 15 min
- Nerves, hormones and their effects 15 min
3(a) Reproduction
4 lessons · about 62 minutes
3(b) Inheritance
11 lessons · about 2 h 45 min
- Genes, chromosomes and alleles 13 min
- DNA and the genome · video 15 min
- RNA and protein synthesis 16 min
- Inheritance and Punnett squares · video 18 min
- Codominance and blood groups 13 min
- Family pedigrees and probability 15 min
- Mitosis and the cell cycle · video 15 min
- Meiosis and reproduction · video 15 min
- Variation and mutation · video 14 min
- Mutations and their effects 14 min
- Evolution by natural selection · video 16 min
4 Ecology and the environment
9 lessons · about 2 h 15 min
- Ecosystems and interdependence · video 15 min
- Sampling with quadrats and transects · video 15 min
- Biodiversity and human impact · video 15 min
- Food chains, webs and pyramids 15 min
- The carbon and water cycles · video 15 min
- Nitrogen cycle, decomposition and food security · video 16 min
- Air pollution and the greenhouse effect 15 min
- Sewage and eutrophication 14 min
- The effects of deforestation 13 min