OCR · GCSE
Your journey to excellence inCombined Science
By Revision Genie
I want to study…
Start learning
Start with the first Combined Science lesson.
Cells as the basic unit of life
1Cells as the basic unit of lifeRead next2Plant cells vs animal cells: key similarities and differencesRead next3Prokaryotic cells vs eukaryotic cellsRead next4Cell organelles and their functionsRead next5Using a light microscope safely and correctlyRead next6Preparing slides and using stains to improve contrastRead next7Calculating magnification and image sizeRead next8Comparing light and electron micrographs (what each can show)Read next9The role of DNA in cells (genetic material as a code)Read next10Proteins as biological molecules with specific functionsRead next11Enzymes as biological catalystsRead next12Lock-and-key model and enzyme specificityRead next13Factors affecting enzyme activity: temperature, pH, substrate concentrationRead next
What respiration is and why cells need it
1What respiration is and why cells need itRead next2Aerobic respiration: word equation and key ideasRead next3Anaerobic respiration in musclesRead next4Anaerobic respiration in microorganisms (fermentation basics)Read next5Comparing aerobic vs anaerobic respiration (energy release)Read next6Respiration as an enzyme-controlled processRead next7Using respiration ideas to explain exercise and recoveryRead next8Interpreting simple data about respiration rateRead next
Photosynthesis as a chemical reaction in plants
1Photosynthesis as a chemical reaction in plantsRead next2The word equation and what it meansRead next3Chloroplasts and chlorophyll: where photosynthesis happensRead next4How light intensity affects photosynthesisRead next5How carbon dioxide concentration affects photosynthesisRead next6How temperature affects photosynthesisRead next7Limiting factors and predicting the rate-limiting factorRead next8Using glucose made in photosynthesis (storage and transport)Read next9Linking photosynthesis and respiration in ecosystemsRead next
Diffusion: what it is and what affects the rate
1Diffusion: what it is and what affects the rateRead next2Osmosis: movement of water and partially permeable membranesRead next3Active transport: moving substances against a concentration gradientRead next4Comparing diffusion, osmosis and active transportRead next5From cells to tissues to organs to organ systemsRead next6Mitosis as cell division for growth and repairRead next7Stem cells: what they are and why they matterRead next8Exchange surfaces: what makes them efficientRead next9Plant transport tissues: xylem and phloem (what they carry)Read next10Transpiration basics and why plants lose waterRead next
Surface area to volume ratio and why it matters
1Surface area to volume ratio and why it mattersRead next2Diffusion distance and exchange efficiencyRead next3Why multicellular organisms need transport systemsRead next4The human circulatory system: overview and purposeRead next5Double circulatory system in mammalsRead next6The heart: chambers, valves and blood vesselsRead next7Arteries, veins and capillaries: structure and functionRead next8Blood components: plasma, red cells, white cells and plateletsRead next9Gas exchange in the lungs: structure and function of alveoliRead next10Interpreting circulatory/gas exchange data in exam-style questionsRead next
The nervous system: CNS, sensory receptors and effectors
1The nervous system: CNS, sensory receptors and effectorsRead next2Stimulus–response pathways and survival valueRead next3Reflex actions and reflex arcsRead next4Synapses (simple model) and neurotransmittersRead next5The endocrine system and hormone signallingRead next6Comparing nervous vs hormonal controlRead next7Homeostasis: maintaining stable internal conditionsRead next8Thermoregulation: sweating, shivering and blood flow changesRead next9Blood glucose control: insulin and glucagonRead next10Diabetes (type 1 and type 2 at GCSE level)Read next11Kidneys and osmoregulation (water balance)Read next12Negative feedback as a control mechanismRead next
What an ecosystem is (biotic and abiotic factors)
1What an ecosystem is (biotic and abiotic factors)Read next2Levels of organisation: organism to community to ecosystemRead next3Food chains and trophic levelsRead next4Food webs and interdependenceRead next5Competition and predator–prey relationshipsRead next6Pyramids of number, biomass and energyRead next7Decomposers and nutrient recyclingRead next8The carbon cycleRead next9The water cycleRead next10Biodiversity: what it means and why it mattersRead next11Human impacts on ecosystems (habitat loss, pollution)Read next
DNA, genes and chromosomes: the big picture
1DNA, genes and chromosomes: the big pictureRead next2Genetic terms: genotype, phenotype and allelesRead next3Dominant and recessive inheritanceRead next4Monohybrid crosses using Punnett squaresRead next5Inherited disorders (using clear examples)Read next6Sex determination (XX/XY) and inheritance patternsRead next7Variation: genetic vs environmentalRead next8Mutation as a source of new variationRead next9Natural selection: how it works, step by stepRead next10Evolution and adaptation (linking to survival and reproduction)Read next11Selective breeding: process, benefits and drawbacksRead next12Antibiotic resistance as an example of evolution in actionRead next
Monitoring ecosystems and environmental change
1Monitoring ecosystems and environmental changeRead next2Pollution and biodiversity: causes and consequencesRead next3Food security: why feeding humans is challengingRead next4Increasing food production: farming methods and trade-offsRead next5Fertilisers and eutrophication (cause → effect chains)Read next6Genetic modification in crops: potential benefits and concernsRead next7Health and disease: what the terms meanRead next8Communicable vs non-communicable diseasesRead next9Pathogens (virus, bacteria, protist, fungi) and how disease spreadsRead next10Plant diseases and human infections (named examples)Read next11Reducing spread: hygiene, isolation, plant control measuresRead next12White blood cells and platelets: how they protect the bodyRead next13Non-specific defences (skin, mucus, stomach acid)Read next14Vaccination: how vaccines work and why they’re usedRead next15Antibiotics, antivirals and antiseptics (what each is for)Read next16Developing new medicines: preclinical and clinical testingRead next17Lifestyle factors and disease risk (smoking, diet, exercise, alcohol)Read next
Solids, liquids and gases in the particle model
1Solids, liquids and gases in the particle modelRead next2Explaining density using particlesRead next3Explaining diffusion using particlesRead next4Gas pressure in terms of particle collisionsRead next5Changes of state and heating/cooling curvesRead next6Internal energy and temperature (what changes and why)Read next7Atomic structure: protons, neutrons and electronsRead next8Isotopes and relative atomic massRead next9Electronic structure (simple shell model)Read next10The Periodic Table: periods and groupsRead next11Metals vs non-metals: typical physical propertiesRead next12Using atomic structure to explain simple reactivity patternsRead next
Elements, compounds and mixtures: clear definitions
1Elements, compounds and mixtures: clear definitionsRead next2Pure substances and impuritiesRead next3Filtration, crystallisation and simple distillationRead next4Fractional distillation (separating liquids)Read next5Paper/TLC chromatography: how separation worksRead next6Reading chromatograms and calculating Rf valuesRead next7Choosing the best separation technique for a substanceRead next8Ionic bonding: electron transfer and ion formationRead next9Covalent bonding: sharing electrons and moleculesRead next10Metallic bonding: why metals conduct and are malleableRead next11Giant ionic structures vs simple molecular substancesRead next12Polymers: repeating units and basic propertiesRead next13Materials: ceramics, polymers, composites and alloys (uses)Read next
Writing word equations and balancing symbol equations
1Writing word equations and balancing symbol equationsRead next2Conservation of mass (reactants vs products)Read next3Exothermic and endothermic reactionsRead next4Reaction profiles (energy changes)Read next5Acids and alkalis: pH and neutralisationRead next6Making salts (including crystallisation of a soluble salt)Read next7Reactivity series of metals (patterns and uses)Read next8Displacement reactions (metal and halogen examples)Read next9Oxidation and reduction (electron/oxygen ideas at GCSE level)Read next10Electrolysis: what it is and why ions matterRead next11Electrolysis of molten ionic compounds (products at electrodes)Read next12Electrolysis of aqueous solutions (how products are chosen)Read next
Using the Periodic Table to predict chemical behaviour
1Using the Periodic Table to predict chemical behaviourRead next2Group 1 metals: reaction patterns (water and oxygen)Read next3Group 7 halogens: reaction patterns and displacementRead next4Noble gases: why they’re unreactiveRead next5Naming key compounds from formulas (basic GCSE set)Read next6Identifying ions with flame tests and simple precipitation testsRead next7Identifying gases (hydrogen, oxygen, carbon dioxide, chlorine)Read next8Using tests to identify unknown substances in exam questionsRead next9Using observations to infer reaction typeRead next
Collision theory: why reactions happen at different speeds
1Collision theory: why reactions happen at different speedsRead next2Measuring rate: gas volume, mass change, precipitationRead next3Factors affecting rate: temperature, concentration, surface areaRead next4Catalysts and enzymes (comparing role as catalysts)Read next5Interpreting rate graphs (tangent/gradient ideas)Read next6Reversible reactions and dynamic equilibriumRead next7Le Chatelier’s principle (temperature, pressure, concentration)Read next8Equilibrium in industrial processes (Haber process context)Read next9Yield, atom economy and sustainability linksRead next
Finite resources and sustainable chemistry choices
1Finite resources and sustainable chemistry choicesRead next2Life-cycle assessments: what they include and why they matterRead next3Recycling: benefits, limitations and real-world trade-offsRead next4Crude oil as a resource and why it’s usefulRead next5Fractional distillation of crude oil: fractions and usesRead next6Cracking hydrocarbons: conditions and productsRead next7Alkanes and the homologous series (patterns in formulas)Read next8Polymer production and environmental impactsRead next9Earth’s atmosphere: changes over time (GCSE narrative)Read next10Greenhouse effect vs climate change (separating ideas clearly)Read next11Human activity and atmospheric composition (evidence-based links)Read next12Potable water production and wastewater treatment (core stages)Read next
Particle model in physics (motion and spacing)
1Particle model in physics (motion and spacing)Read next2Density: measuring, calculating, and interpreting resultsRead next3Pressure in fluids (qualitative + simple calculations)Read next4Moments and turning effect in everyday contexts (if assessed in suite questions)Read next5Changes of state: melting, boiling, evaporation, condensationRead next6Latent heat and why temperature stays constant during change of stateRead next7Heating curves: reading and sketching from dataRead next8Gas pressure and temperature/volume trends (basic model)Read next
Distance, time and speed: core definitions
1Distance, time and speed: core definitionsRead next2Using distance–time graphsRead next3Velocity and acceleration (what they mean)Read next4Using velocity–time graphs (including distance from area)Read next5Calculating acceleration from data/graphsRead next6Newton’s first law: inertia and balanced forcesRead next7Newton’s second law: force, mass and accelerationRead next8Newton’s third law: action–reaction pairsRead next9Weight, mass and gravitational field strengthRead next10Friction, drag and terminal velocityRead next11Stopping distance: thinking and braking distance factorsRead next12Hooke’s law and spring extensionRead next13Work done by a force and energy transfer in motionRead next
Static charge: build-up, attraction and discharge
1Static charge: build-up, attraction and dischargeRead next2Current as rate of flow of chargeRead next3Potential difference and what it representsRead next4Series circuits: current, potential difference and resistance rulesRead next5Parallel circuits: current splitting and shared potential differenceRead next6Resistance and the I = V/R relationshipRead next7Measuring current and potential difference correctlyRead next8I–V characteristics for ohmic conductors and non-ohmic componentsRead next9Power in electrical devices (power, energy and time links)Read next10Mains electricity safety: live, neutral, earth, fusesRead next11Magnets and magnetic fields (field lines and poles)Read next12Electromagnets: making and strengthening themRead next13Using electromagnets in real devices (relays, motors context)Read next
Transverse vs longitudinal waves
1Transverse vs longitudinal wavesRead next2Describing waves: amplitude, wavelength, frequency, periodRead next3The wave equation and basic calculationsRead next4Reflection and refraction (ray ideas and wave speed changes)Read next5Sound waves: pitch, volume and oscilloscopes (core interpretation)Read next6Electromagnetic spectrum: order and key usesRead next7Hazards and safety with different EM wavesRead next8Radioactivity: what it is and why nuclei are unstableRead next9Alpha, beta and gamma: properties and penetrationRead next10Irradiation vs contaminationRead next11Half-life (interpreting graphs and simple calculations)Read next12Background radiation and riskRead next
Energy stores and pathways (transfers)
1Energy stores and pathways (transfers)Read next2Conservation of energy and Sankey diagramsRead next3Work done as energy transferredRead next4Kinetic and gravitational potential energy calculationsRead next5Elastic potential energy in springs (GCSE calculation focus)Read next6Power: what it means and how to calculate itRead next7Efficiency and why no process is 100% efficientRead next8Ways to improve efficiency in everyday systemsRead next9Energy resources: comparing reliability and environmental impactRead next
Physics on the move: forces and energy in transport
1Physics on the move: forces and energy in transportRead next2Reducing unwanted energy transfers in vehiclesRead next3Braking and safety features explained with forces/energy ideasRead next4Powering Earth: how electricity is generatedRead next5Non-renewable vs renewable resources: pros and consRead next6National and local issues: demand, reliability and costRead next7Transformers (core idea: stepping voltage up/down)Read next8Transmission efficiency and why high voltage is usedRead next9Storing energy from renewables (batteries, pumped storage context)Read next
Lab safety: hazards, risks and control measures
1Lab safety: hazards, risks and control measuresRead next2Writing a clear method that can be repeatedRead next3Identifying independent, dependent and control variablesRead next4Accuracy, precision, repeatability and reproducibilityRead next5Estimating uncertainty and spotting anomalous resultsRead next6Recording data in suitable tables (headings, units, resolution)Read next7Drawing graphs correctly (scales, labels, best-fit lines)Read next8Interpreting gradients and areas where relevantRead next9Sampling techniques and using means appropriatelyRead next10Required apparatus and techniquesRead next11Planning and evaluating practical investigations (improvements and limitations)Read next12Linking practical methods to exam questions (methods, variables, calculations, conclusions)Read next