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All curriculum guides/Irish Leaving Certificate/Biology

IE·Subject guide

Biology

Leaving Certificate Biology (NCCA specification), Higher and Ordinary Level, with the SEC examination.

Editorially reviewed26 July 2026·Leaving Certificate
Complete topic map ↓Official sources ↗︎
Biology·Leaving Certificate
Topic nodes
18
Levels and pathways
2
Regions
1
Public references
2
Contents+
  1. 01Overview
  2. 02Complete topic map
  3. 03Where this subject applies
  4. 04Official sources
  5. 05In-depth guides

Contents

  1. 01Overview
  2. 02Complete topic map
  3. 03Where this subject applies
  4. 04Official sources
  5. 05In-depth guides

Overview

Biology

Leaving Certificate Biology (NCCA specification), Higher and Ordinary Level, with the SEC examination.

Subject guide
Leaving Certificate
Topics mapped
18

Complete topic map

Complete topic map

Every topic recorded for this subject in the curriculum is reproduced below in its full hierarchy. The descriptions reflect the mapped scope without implying additional exam rules.

  1. 01

    The Scientific Method and the Characteristics of Life

    Introduces how biologists work through experiment, observation and theory, and the defining features common to all living organisms.

  2. 02

    Food and Nutrition (Biomolecules)

    Covers the chemical building blocks of life — carbohydrates, lipids, proteins, vitamins, minerals and water — and their roles in living things.

  3. 03

    Ecology and the Study of an Ecosystem

    Examines how organisms interact with each other and their environment, including nutrient cycles, energy flow, populations, pollution and a practical investigation of a local habitat.

  4. 04

    Cell Structure and Cell Diversity

    Explores the ultrastructure of plant and animal cells, organelles, the cell as a unit of life, and how cells differentiate into tissues and organs.

  5. 05

    Enzymes and Energy Carriers

    Looks at the structure, action and control of enzymes as biological catalysts and the role of ATP in cellular energy transfer.

  6. 06

    Photosynthesis and Respiration

    Studies how cells capture and release energy, comparing the light and dark stages of photosynthesis with aerobic and anaerobic respiration.

  7. 07

    Movement Through Cell Membranes

    Explains diffusion, osmosis and active transport as the means by which substances pass into and out of cells.

  8. 08

    Cell Continuity and Cell Division

    Covers the cell cycle, mitosis and meiosis, and their importance in growth, repair and the production of gametes.

  9. 09

    DNA, Genetics and Heredity

    Investigates the structure and replication of DNA, protein synthesis, the laws of inheritance and the working of monohybrid genetic crosses.

  10. 10

    Variation, Evolution and Genetic Engineering

    Examines sources of genetic variation, the theory of evolution by natural selection, and applications and ethics of modern genetic engineering.

  11. 11

    Diversity of Organisms (Five Kingdoms)

    Surveys the classification of living things and detailed study of bacteria (Monera), a protist, a fungus and the structure of viruses.

  12. 12

    Structure and Transport in the Flowering Plant

    Examines plant tissues, organs and the transport of water, minerals and food through the vascular system of flowering plants.

  13. 13

    Human Nutrition and the Digestive System

    Covers a balanced human diet and the structure and functioning of the alimentary canal in processing and absorbing food.

  14. 14

    Circulation and the Human Defence System

    Studies the heart, blood vessels and composition of blood, together with the body's defences against disease, including immunity and the lymphatic system.

  15. 15

    Breathing, Excretion and Homeostasis

    Looks at gas exchange and the breathing system, removal of metabolic waste by the kidney and skin, and the maintenance of a stable internal environment.

  16. 16

    Coordination: Nervous, Sensory and Endocrine Systems

    Examines how the body detects and responds to stimuli through the nervous system, sense organs and chemical control by hormones.

  17. 17

    Support, Movement and the Musculoskeletal System

    Covers the human skeleton, joints, muscles and the principles of support and locomotion, including plant responses to stimuli.

  18. 18

    Reproduction in Plants and Humans

    Studies sexual reproduction in the flowering plant and the structure, functioning and development of the human reproductive systems.

Where this subject applies

Where this subject applies

These pathways and regions are explicitly connected to the subject in the curriculum.

Levels and pathways

  1. 01

    Higher Level

    Higher Level — the more demanding level, with broader and deeper content and the H1–H8 grade scale.

  2. 02

    Ordinary Level

    Ordinary Level — the foundational level covering the core of the syllabus, graded O1–O8.

Official sources

Official sources

The public sources below are referenced directly by this subject or by one of its topics.

This editorial selection points to the relevant official bodies. Always confirm current requirements, dates and exceptional arrangements with your school and the responsible authority.

2
Public references

S·01National Council for Curriculum and Assessment (NCCA)Leaving Certificate subject specifications & syllabusesOpen source↗︎S·02State Examinations Commission (SEC)State Examinations Commission — Leaving Certificate examination & marking schemesOpen source↗︎

In-depth guides

In-depth guides

G·01How to read your Leaving Certificate specificationYour subject specification and the SEC exam papers are the documents your exam is written from. How to find the right ones, read them the way an examiner does, and turn them into a checklist.2 min read→G·02Your Leaving Cert study plan: an 8-week methodA realistic eight-week Leaving Cert study plan: an honest audit, subjects in rotation with active recall, orals and projects planned in, full papers to finish.8 min read→G·03How does the Leaving Certificate work? Papers, levels and gradingNCCA specifications and SEC exams, Higher and Ordinary Level, H1–H8 and O1–O8 grades, orals, projects and marking schemes: how the Leaving Cert fits together.7 min read→

Open curriculum guide →

IE · EuraStudy Guides

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