Junior Cycle Science Notes
Free Junior Cycle Science revision notes for Common Level. Browse 38 topics and read online without an account.
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Explore the diversity of living things, cells and the microscope and the breathing system.
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Biological World
12 topicsB Diversity of Living ThingsDiversity of living things explores how organisms are classified, how natural selection drives evolution, and how species interact within habitats.B Breathing SystemThe breathing system takes in oxygen for cellular respiration and removes carbon dioxide and water vapour from the body.B Cells and the MicroscopeCells are the basic building blocks of all living things, studied in detail using a light microscope.B Circulatory SystemThe circulatory system consists of your heart, blood vessels, and blood, working continuously to deliver oxygen and nutrients while carrying away metabolic…B Digestive SystemThe digestive system breaks down large, insoluble food into small, soluble molecules that enter the bloodstream to nourish body cells.B Ecology & Habitat StudyEcology is the study of how living organisms interact with one another and their environment.B EvolutionEvolution describes how populations of living things gradually change over generations through natural selection.B Reproduction and GeneticsReproduction ensures species survival, while genetics explains how traits pass between generations.B Human HealthHuman health is a complete state of physical, mental, and social wellbeing influenced by genetics, environment, and daily choices.B Human ReproductionHuman sexual reproduction involves male and female sex cells joining to create a new individual that develops in the uterus until birth.B PhotosynthesisPhotosynthesis is the process green plants use to make glucose and oxygen from carbon dioxide and water, using light energy trapped by chlorophyll.B Plant Growth & ReproductionGreen plants make their own food by photosynthesis, respire constantly to release energy, and reproduce sexually or asexually.
Chemical World
11 topicsC Acids & BasesAcids and bases are chemical opposites that react together during neutralisation to form a salt and water.C Chemical ReactionsChemical reactions rearrange atoms into new substances with new properties while total mass is conserved.C Rates of Chemical ReactionsReaction rate measures how fast reactants turn into products during a chemical reaction.C Elements, Compounds & MixturesEverything around us is made of matter, which can be sorted into elements, compounds and mixtures depending on whether atoms are chemically joined.C Metals & Non-MetalsElements are grouped as metals or non-metals, and the two groups behave very differently.C Separating MixturesA mixture contains two or more substances mixed together but not chemically combined, so they can be separated using physical methods.C SolutionsA solution is a mixture formed when a solute dissolves completely and evenly into a solvent.C States of MatterMatter is anything that has mass and takes up space, existing as a solid, liquid, or gas.C Structure of the AtomAn atom is the basic building block of all matter, made of a dense central nucleus surrounded by orbiting electrons.C The Periodic TableThe Periodic Table organises all known chemical elements in order of increasing atomic number, placing elements with similar chemical properties into…C Ratio of Atoms in CompoundsChemical compounds contain different elements chemically joined in fixed numerical ratios of atoms, represented by chemical formulae.
Earth and Space
8 topicsE&S Climate ChangeClimate change is the long-term shift in global temperatures and weather patterns caused by an enhanced greenhouse effect.E&S Earth-Sun-Moon SystemThe Earth-Sun-Moon system explains predictable astronomical events including day and night, seasons, lunar phases, and eclipses.E&S Energy SourcesThis topic explores how different energy sources are classified and how our society can meet its energy needs sustainably.E&S The UniverseThis topic explores celestial bodies, the Earth–Sun–Moon system, planetary data, the Big Bang theory, and space exploration.E&S Space TravelSpace travel involves launching spacecraft beyond Earth's atmosphere for research, satellite technology, and exploration.E&S Cycling of MatterCycling of matter describes how water and carbon move between Earth's surface, living things, and the atmosphere.E&S Celestial ObjectsCelestial objects are the natural objects in space: stars, planets, moons, asteroids, comets, and galaxies.E&S SustainabilityEarth and space sustainability looks at how natural cycles and human actions shape our climate, alongside the risks and benefits of space missions.
Nature of Science
1 topicPhysical World
6 topicsP DensityDensity tells us how tightly packed the mass is inside a given volume of a material.P ElectricityElectricity is the flow of charge around a closed circuit to transfer energy and power devices.P EnergyEnergy is what makes things happen: it is the ability to do work, and it is measured in joules (J).P ForcesA force is a push or a pull that can change an object's speed, direction, or shape.P MeasurementMeasurement means finding the size of a physical quantity, such as length or mass, using the correct unit and the correct instrument.P TechnologyThis topic explores how electronic components control current in sensing circuits, how energy efficiency is calculated, and how technology affects society…
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