GCSE Biology Edexcel 2027
Preparing for Edexcel GCSE Biology 2027? Biology is one of those subjects where understanding beats memorising. If you can explain processes clearly, use data confidently, and apply ideas to new situations, you’ll score highly even on unfamiliar questions. On this page you’ll find a clear overview of the Edexcel course content and what the exams will ask you to do.
Exam content
The Pearson Edexcel GCSE Biology 1BI0 specification for 2027 covers nine main topic areas:
Key concepts in biology provides many of the ideas and skills used throughout the rest of the course. You need to understand the structures and functions of animal, plant and bacterial cells, as well as how specialised cells such as sperm, egg and ciliated epithelial cells are adapted for their functions. Microscopy is also important, including magnification, scale and the use of different units.
You’ll study enzymes and how factors such as temperature, pH and substrate concentration affect their activity. You also need to understand how enzymes are involved in building up and breaking down carbohydrates, proteins and lipids. Standalone Biology includes food tests and using calorimetry to measure the energy contained in food.
The topic also covers diffusion, osmosis and active transport. Make sure you can explain how substances move into and out of cells and calculate percentage changes in mass during osmosis investigations. Topic 1 is particularly important because it is assessed on both Paper 1 and Paper 2.
Higher Tier only
- Carry out calculations involving numbers written in standard form.
Cells and control focuses on how organisms grow, develop and respond to their surroundings. You need to understand the stages of the cell cycle and mitosis, including how mitosis produces genetically identical diploid cells and why it is important for growth, repair and asexual reproduction.
You’ll also study cancer, cell differentiation and stem cells, including the potential benefits and risks of using stem cells in medicine. Growth can be monitored using percentile charts, so you should be comfortable interpreting this type of data.
The topic also covers the brain and nervous system, sensory and motor neurones, synapses and reflex arcs. In standalone Biology, you’ll also study the structure and function of the eye, common eye defects such as short-sightedness and long-sightedness, and how these can be corrected.
Higher Tier only
- Explain how CT and PET scanning can help scientists investigate brain function despite the difficulty of accessing brain tissue.
- Explain limitations in treating damage and disease of the brain and nervous system, including spinal injuries and brain tumours.
Genetics covers reproduction, DNA and how characteristics are inherited. You need to understand the advantages and disadvantages of sexual and asexual reproduction, how meiosis produces genetically different haploid gametes, and the structure of DNA, genes and the genome.
You’ll use genetic diagrams, Punnett squares, family pedigrees and probabilities to predict inheritance. Make sure you understand terms such as allele, dominant, recessive, homozygous, heterozygous, genotype and phenotype. The topic also includes sex determination, ABO blood groups, the work of Gregor Mendel and the causes of genetic and environmental variation.
You should also understand mutations and their possible effects, as well as the Human Genome Project and how knowledge of the human genome can be used in medicine.
Higher Tier only
- Explain how the sequence of DNA bases determines the sequence of amino acids and therefore the shape and function of a protein.
- Describe protein synthesis, including transcription and translation.
- Explain how genetic variants in non-coding DNA can affect how much protein is produced.
- Explain how genetic variants in coding DNA can alter protein structure and activity.
- Explain how sex-linked genetic disorders are inherited.
This topic covers evolution and the ways humans can influence inheritance. You need to understand Charles Darwin’s theory of evolution by natural selection and the work of Darwin and Alfred Wallace. Antibiotic resistance is an important example of natural selection happening in a population.
You’ll also study evidence for human evolution, including fossils such as Ardi and Lucy, Richard Leakey’s discoveries and changes in stone tools. Other evidence for evolution includes the pentadactyl limb and genetic evidence that contributed to the three-domain system of classification.
The topic also includes selective breeding, tissue culture and genetic engineering. You should be able to explain how these techniques are used and evaluate their advantages, disadvantages, practical implications and ethical issues in agriculture and medicine.
Higher Tier only
- Describe the main stages of genetic engineering, including the use of restriction enzymes, ligase, sticky ends and vectors.
This topic looks at communicable and non-communicable disease and how disease can be prevented and treated. You need to understand different types of pathogens, including viruses, bacteria, fungi and protists, and named diseases such as cholera, tuberculosis, malaria, HIV and Chalara ash dieback.
You’ll study how pathogens spread, how the human body protects itself and how the specific immune system responds to infection. Immunisation and antibiotics are important areas, including why antibiotics do not work against viruses. Standalone Biology also includes plant defences, plant disease and the detection of plant pathogens.
The development of medicines is another major part of the topic. You should understand preclinical and clinical testing, placebo-controlled and double-blind trials, and how evidence is evaluated. Non-communicable diseases are also covered, including lifestyle risk factors and different approaches to treating cardiovascular disease.
Higher Tier only
- Describe how monoclonal antibodies are produced using lymphocytes and hybridoma cells.
- Explain uses of monoclonal antibodies, including pregnancy tests, diagnosis and targeted treatment of diseases such as cancer.
Plant structures and their functions covers photosynthesis, transport and responses in plants. You need to understand photosynthesis as an endothermic reaction and explain how light intensity, carbon dioxide concentration and temperature can limit its rate.
You’ll study how root hair cells absorb water and mineral ions and how xylem and phloem are adapted for transport. Make sure you can explain transpiration, translocation and how environmental conditions such as light intensity, temperature and air movement affect water uptake and transpiration.
Standalone Biology also includes leaf adaptations, plant adaptations to extreme environments and plant hormones. You should understand how auxins control phototropism and gravitropism and how plants coordinate their growth and development.
Higher Tier only
- Explain how temperature, light intensity and carbon dioxide concentration interact as limiting factors in photosynthesis.
- Use the inverse square relationship between light intensity and distance from a light source.
- Describe commercial uses of auxins, gibberellins and ethene, including weedkillers, rooting powders, seedless fruit production and fruit ripening.
This topic focuses on hormonal control and how the body keeps its internal environment stable. You need to understand where hormones are produced, how they travel in the blood and how they act on target organs.
You’ll study the menstrual cycle, including the roles of oestrogen and progesterone, as well as hormonal and barrier methods of contraception. Homeostasis includes temperature regulation, blood glucose control and water balance. You also need to understand the role of insulin, the causes and control of type 1 and type 2 diabetes and the relationship between body mass and type 2 diabetes.
Standalone Biology goes further into the urinary system and kidneys, including the structure of the nephron, filtration, selective reabsorption, water reabsorption, kidney failure and the production of urea.
Higher Tier only
- Explain how adrenaline prepares the body for fight or flight.
- Explain how thyroxine controls metabolic rate through negative feedback.
- Explain how oestrogen, progesterone, FSH and LH interact during the menstrual cycle.
- Explain the use of hormones in assisted reproductive technology, including IVF and clomifene therapy.
- Explain the roles of vasoconstriction and vasodilation in thermoregulation.
- Explain how glucagon helps regulate blood glucose concentration.
- Explain how ADH changes the permeability of the collecting duct to regulate the water content of the blood.
Exchange and transport in animals looks at how organisms exchange substances with their environment and move them around the body. You need to understand why multicellular organisms require exchange surfaces and transport systems and be able to calculate surface area to volume ratios.
You’ll study how alveoli are adapted for gas exchange and the factors affecting diffusion, including surface area, concentration gradient and diffusion distance. Standalone Biology also includes using Fick’s law to calculate the rate of diffusion.
The topic covers blood, blood vessels and the structure of the heart and circulatory system. You’ll also study aerobic and anaerobic respiration and investigate respiration in living organisms. Make sure you can calculate heart rate, stroke volume and cardiac output and interpret data relating to exercise and respiration.
Higher Tier only
- Carry out calculations involving numbers written in standard form when required.
Ecosystems and material cycles covers relationships between organisms and their environment. You need to understand populations, communities and ecosystems, as well as how abiotic factors such as temperature, light and water and biotic factors such as competition and predation affect communities.
You’ll study interdependence, parasitism and mutualism and use fieldwork techniques such as quadrats and belt transects to investigate organisms. Food chains, trophic levels, biomass and the efficiency of energy transfer are also important, as are the effects of human activities on biodiversity.
The topic also covers food security and the cycling of materials through ecosystems. You need to understand the carbon cycle, water cycle and nitrogen cycle, the role of decomposers and microorganisms and factors affecting decomposition. Human impacts such as pollution, eutrophication, fish farming, invasive species and conservation can also be assessed.
Higher Tier only
- Evaluate the use of indicator species as evidence of pollution, including organisms associated with polluted and clean water and different levels of air pollution.
What to expect in the Edexcel GCSE Biology exam
Edexcel GCSE Biology is assessed with two written papers. Paper 1 assesses Topics 1–5, while Paper 2 assesses Topic 1 and Topics 6–9. Topic 1 can therefore appear on both papers. Each paper is 1 hour 45 minutes, worth 100 marks and accounts for 50% of the qualification. The papers include multiple choice, short answers, calculations, and extended open-response questions, and calculators can be used. Because both papers can include data and maths, it’s worth practising calculations alongside content revision, not as a last-minute add-on.
A big difference in how Edexcel feels is the way questions often build up. You might start with a straightforward 1-mark definition, then move into data interpretation, then finish with an extended response. The best strategy is to treat each part as its own mini task. Get the early marks quickly, then slow down for the higher-mark explanation, using clear steps and biology keywords that match the question.
Edexcel also rewards students who understand practical science. Even if you are not doing a “practical exam”, practical skills are assessed through written questions. When you see a method or results table, look immediately for variables and reliability. Ask yourself: what is being changed, what is being measured, and what must be kept the same? Then add improvement points like repeats, more precise measuring equipment, and controlling temperature. These are easy marks when you know the pattern.
Finally, practise extended responses with a simple structure. Start with a direct answer, then explain using a logical chain, and finish with a short conclusion that links back to the question. If a question asks for two or three points, number them. This stops you from accidentally writing one long paragraph where an examiner cannot clearly see separate marking points. In the exam, keep an eye on time, do not get stuck on one question, and always check units and rounding in calculation questions before moving on.
