JC Science study guide
JC Science · Work through your exam, one topic at a time.
Junior Cycle Science is the Irish lower-secondary science specification, typically studied over three years and assessed through a written examination plus Classroom-Based Assessments. It suits students around ages 12–15 who are building a foundation in scientific literacy rather than preparing for a professional licence; teachers and parents often search for it too when supporting revision. The JC Science study guide has 10 sections and about 3,447 words.
01Nature of Science: investigation, data and evaluation
Nature of Science (NOS) is the unifying strand of Junior Cycle Science: it is examined through every other strand, so questions about variables, measurement, graphs and conclusions can appear in a biology, chemistry or physics context. Expect to design a fair test, identify variables, handle data with units, and judge whether a conclusion is supported.
355 words, about 2 min02Cells, nutrition, digestion, respiration, circulation and excretion
This domain links cell structure to how the body obtains and uses energy. Expect labelling of cells, food tests, enzyme action, the digestive system, the heart and blood vessels, respiration equations and the kidney.
345 words, about 2 min03Genetics, reproduction, inheritance and evolution
Genetics explains how characteristics pass from parents to offspring; evolution explains how populations change over time. The exam asks you to use DNA, chromosomes and alleles, complete a genetic cross, and explain natural selection with evidence.
344 words, about 2 min04Ecology, ecosystems, biodiversity and human impact
Ecology studies how organisms interact with each other and their environment. The exam tests levels of organisation, food webs, energy flow, nutrient cycling, biodiversity and the effects of human activity.
338 words, about 2 min05Matter, atoms, elements, compounds, mixtures and separation
Chemistry begins with what matter is made of and how mixtures can be separated. The exam asks for particle ideas, the periodic table, the compound/mixture distinction, and a justified choice of separation technique.
352 words, about 2 min06Chemical reactions, acids and bases, rates and energy changes
This domain covers equations, neutralisation, collision theory and energy changes. Expect to balance equations, use the pH scale, name salts, and explain how rate changes without confusing it with yield.
345 words, about 2 min07Forces, motion, energy, work and power
This domain links forces to motion and energy to work and power. The exam asks for calculations with correct units, graph interpretation, and descriptions of energy using stores and transfers rather than 'using up'.
355 words, about 2 min08Electricity, magnetism, light, sound and waves
This domain covers circuits, magnets, ray diagrams and wave behaviour. Expect Ohm's law calculations, series/parallel comparisons, refraction and the wave equation.
355 words, about 2 min09Earth and space: rocks, weather, climate, solar system and universe
Earth and space covers rocks and the rock cycle, weathering, weather versus climate, and Earth's place in the solar system and universe. The exam rewards explanation rather than naming alone.
353 words, about 2 min10Science in society: applications, ethics, sustainability and STEM careers
Science in society asks you to evaluate claims, weigh evidence and consider consequences. The exam rewards balanced judgements about applications, ethics and sustainability rather than lists of facts.
305 words, about 2 min