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Exam Review

Key Facts: LC Ag Science Exam

4 strands

The specification has Scientific practices, Soils, Crops and Animals

NCCA Leaving Certificate Agricultural Science specification

75% + 25%

Written examination is 75% (300 marks); IIS coursework is 25% (100 marks)

NCCA specification / State Examinations Commission

2.5 hours

The written Agricultural Science paper lasts two and a half hours

NCCA Leaving Certificate Agricultural Science specification

8 themes

Eight cross-cutting themes include sustainability, genetics, nutrition and health and safety

NCCA Leaving Certificate Agricultural Science specification

IIS brief

The Individual Investigative Study is based on an annual thematic brief from the SEC

State Examinations Commission coursework guidance

H1-H8

Higher Level grades range from H1 (90-100%) to H8 (below 30%)

State Examinations Commission grading scale

2019 spec

The current specification was introduced in September 2019 and first examined in 2021

NCCA / SEC Agricultural Science materials

100

Free original single-best-answer practice questions here

OpenExamPrep

Leaving Certificate Agricultural Science is the Irish senior-cycle ag-science subject set by the NCCA and examined by the SEC. Assessment is a 2.5-hour written paper (75%, 300 marks) plus an Individual Investigative Study (25%, 100 marks). Content spans four strands—scientific practices, soils, crops and animals—plus cross-cutting themes such as genetics, sustainability and farm safety. This 100-question bank provides original single-best-answer concept practice across those areas for revision, not as an official paper simulation.

Sample LC Ag Science Practice Questions

Try these sample questions to review concepts for the LC Ag Science exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a scientific investigation, what is a hypothesis?
A.A final conclusion proved by one trial
B.A testable prediction based on observations or prior knowledge
C.A random guess that cannot be tested
D.A list of safety rules for the laboratory
Explanation: A hypothesis is a testable statement or prediction grounded in observation or existing knowledge. Experiments are designed to support or refute it using controlled evidence.
2In a controlled experiment comparing two fertiliser rates on grass growth, what is the independent variable?
A.Grass dry matter yield
B.The fertiliser application rate applied by the investigator
C.Soil temperature measured during the trial
D.The number of earthworms counted in each plot
Explanation: The independent variable is what the investigator deliberately changes. Here that is fertiliser rate. Yield and other measured responses are dependent variables.
3What does accuracy mean in scientific measurement?
A.How close repeated measurements are to each other
B.How close a measurement is to the true or accepted value
C.How expensive the measuring instrument is
D.How many decimal places are written down
Explanation: Accuracy is closeness to the true or accepted value. Precision is how close repeated measurements are to one another, which is different from accuracy.
4Why are control treatments used in agricultural experiments?
A.To make every plot receive the same fertiliser rate
B.To provide a baseline for comparison with the treatments being tested
C.To eliminate the need for replication
D.To ensure the hypothesis is always accepted
Explanation: A control provides a reference condition (often no treatment or standard practice) so treatment effects can be compared fairly. Controls do not remove the need for replication.
5Which statement best distinguishes correlation from causation?
A.If two variables change together, one must cause the other
B.Two variables can change together without one necessarily causing the other
C.Correlation only occurs in laboratory experiments
D.Causation can never be investigated scientifically
Explanation: Correlation means variables co-vary; causation means one produces change in the other. Confounding factors can create correlations without direct causal links.
6What is a key purpose of the Leaving Certificate Agricultural Science Individual Investigative Study (IIS)?
A.To replace the entire written examination
B.To investigate a topic of agricultural significance in depth, based on an annual SEC thematic brief
C.To complete only textbook reading with no data collection
D.To sit an extra multiple-choice paper in school
Explanation: The IIS is coursework based on a thematic brief set by the State Examinations Commission. Students investigate in the context of a specific agricultural enterprise and submit a scientific report (25% of the grade).
7Which practice best improves the reliability of experimental results?
A.Using only one plot and one measurement
B.Replicating treatments and repeating measurements under similar conditions
C.Changing several uncontrolled variables at once
D.Ignoring outliers without recording them
Explanation: Replication and repeated measurements reduce the impact of chance variation and make results more reliable. Changing many factors at once confounds interpretation.
8Which health and safety action is most appropriate before using farm machinery in a student investigation?
A.Ignore guards if the task is short
B.Identify hazards, use appropriate controls and follow safe operating procedures
C.Operate machinery without training if an adult is nearby
D.Disable safety switches to save time
Explanation: The specification emphasises identifying agricultural hazards and applying controls and precautions. Safe procedures and competence are essential around machinery.
9A student finds that silage pH readings from one probe are consistently 0.4 units higher than a calibrated laboratory meter. This mainly indicates a problem with:
A.Precision only
B.Systematic error / bias in the probe readings
C.Perfect accuracy of the probe
D.Random sampling of different silage pits
Explanation: A consistent offset from a true or reference value is systematic error (bias). Precision could still be high if the wrong values are tightly clustered.
10Which feature should a strong IIS report include?
A.A research question, method, results, evaluation of reliability and conclusions linked to the brief
B.Only photographs with no method description
C.Copied text from a website with no investigation
D.A hypothesis that is never tested
Explanation: The IIS expects scientific communication: research question, methodology, data processing, evaluation of evidence and conclusions relating to the SEC thematic brief and enterprise context.

About the LC Ag Science Exam

Leaving Certificate Agricultural Science is an Irish senior-cycle science subject administered by the State Examinations Commission and studied over two years under the NCCA specification (introduced September 2019). It is the study of the science and technology underlying modern agriculture, with emphasis on sustainable use of land, plants and animals. The course has four strands: Scientific practices (overarching investigation skills, safety and how science contributes to agriculture); Soils (formation, classification, physical/chemical/biological properties and management); Crops (plant physiology, classification, establishment, management and harvesting of grass and other crops); and Animals (physiology, classification, production systems, husbandry and health for cattle, sheep and other farm animals). Eight cross-cutting themes permeate the strands: health and safety, technology, breeding and genetics, food production, nutrition, policy and economics, sustainability and environment. Assessment is 75% written examination (2.5 hours; short, structured and synoptic questions) and 25% Individual Investigative Study coursework based on an annual SEC thematic brief. Results use the H1-H8 / O1-O8 grade scales for CAO points.

Exam sponsor: State Examinations Commission (SEC), Ireland. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Two components under the NCCA Agricultural Science specification: (1) written examination at Higher or Ordinary Level lasting two and a half hours, worth 75% (300 marks), with short questions (including some multiple choice and short answers), structured questions and synoptic questions; (2) coursework Individual Investigative Study worth 25% (100 marks) based on an annual thematic brief issued by the SEC. Students also complete a portfolio of specified practical activities. Higher Level assesses all learning outcomes including those in bold; Ordinary Level assesses learning outcomes in normal type.

Time Limit

The written paper lasts two and a half hours and is typically sat during the June Leaving Certificate examinations; the IIS is completed over the two-year course and submitted by the SEC deadline in Year 2.

Passing Score

No fixed pass mark. Results are reported on the H1-H8 scale at Higher Level (H1 = 90-100% down to H8 = below 30%) and O1-O8 at Ordinary Level.

Exam / Certification Fees

Candidates in recognised schools do not pay a separate sitting fee; external and repeat candidates pay an examination fee set annually by the State Examinations Commission.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

15%

Scientific practices and the IIS

Practice covers hypothesis and prediction, variables and controls, accuracy versus precision, validity and reliability, presenting data, health and safety on farm and in investigations, and core concepts for planning an Individual Investigative Study linked to a thematic brief.

25%

Soils (Strand 2)

Practice covers soil formation factors, Irish soil types and profiles, texture and structure, drainage and compaction, pH and liming, cation exchange and flocculation, organic matter, earthworms, rhizosphere, nitrogen and carbon cycles, soil sampling and sustainable fertility management.

30%

Crops (Strand 3)

Practice covers plant physiology (photosynthesis, respiration, transpiration), grass and crop identification, annual/biennial/perennial lifecycles, seed and establishment, dry matter, silage and forage conservation, crop protection and rotation, nutrients and sustainable crop production.

30%

Animals, genetics and production (Strand 4)

Practice covers ruminant versus monogastric digestion, reproduction, performance and progeny testing, genomic selection, nutrition and rationing, dairy and beef systems, sheep production, welfare and disease control, slurry management and environmental impacts of livestock.

Preparing for the LC Ag Science Exam

What You Need to Know

  • Passing score: No fixed pass mark. Results are reported on the H1-H8 scale at Higher Level (H1 = 90-100% down to H8 = below 30%) and O1-O8 at Ordinary Level.
  • Assessment: Two components under the NCCA Agricultural Science specification: (1) written examination at Higher or Ordinary Level lasting two and a half hours, worth 75% (300 marks), with short questions (including some multiple choice and short answers), structured questions and synoptic questions; (2) coursework Individual Investigative Study worth 25% (100 marks) based on an annual thematic brief issued by the SEC. Students also complete a portfolio of specified practical activities. Higher Level assesses all learning outcomes including those in bold; Ordinary Level assesses learning outcomes in normal type.
  • Time limit: The written paper lasts two and a half hours and is typically sat during the June Leaving Certificate examinations; the IIS is completed over the two-year course and submitted by the SEC deadline in Year 2.
  • Exam / certification fees: Candidates in recognised schools do not pay a separate sitting fee; external and repeat candidates pay an examination fee set annually by the State Examinations Commission. Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

LC Ag Science: Suggested Study Strategy

1Learn the four strands and the eight cross-cutting themes so you can link soils, crops and animals to sustainability, genetics, nutrition and health and safety in synoptic answers.
2Master soil fundamentals early: texture, structure, pH, organic matter, compaction, nitrogen cycle and liming—these reappear in crop and animal management questions.
3For grass and forage, know dry matter, silage fermentation principles, reseeding versus permanent pasture and how weather and soil affect establishment.
4Compare ruminant and monogastric digestion clearly and link nutrition to production stage (calf, dry cow, finishing, lactation).
5Practise genetics language: performance testing, progeny testing, genomic selection, hybrid vigour and the difference between selection and genetic engineering.
6Treat the IIS as a full scientific investigation: clear research question, method, controls, data quality, evaluation of reliability and link to the SEC thematic brief.
7Use past SEC papers and marking schemes from examinations.ie for written-answer technique, and use concept questions like these to check factual recall.

Frequently Asked Questions

How is Leaving Certificate Agricultural Science examined?

There are two components: a written examination worth 75% (300 marks) lasting two and a half hours, and an Individual Investigative Study coursework report worth 25% (100 marks). The written paper includes short questions, structured questions and synoptic questions at Higher or Ordinary Level.

What is the Individual Investigative Study (IIS)?

The IIS is coursework based on a thematic brief set annually by the State Examinations Commission. Students investigate a topic of agricultural significance in the context of a specific enterprise, gather and process data, evaluate evidence and submit a scientific report worth 100 marks (25%).

What are the four strands of the Agricultural Science specification?

Strand 1 Scientific practices, Strand 2 Soils, Strand 3 Crops and Strand 4 Animals. Scientific practices underpins the other three strands, and eight cross-cutting themes (including sustainability, genetics, nutrition and health and safety) run through all strands.

Is Leaving Cert Ag Science multiple choice?

Only partly. The official written paper includes some multiple-choice items within short questions, but also short-answer, structured and synoptic written questions. This free bank is original single-best-answer concept practice for study, not a full SEC paper simulation.

How are grades reported?

Higher Level uses H1-H8 and Ordinary Level uses O1-O8. Grades 1-7 cover 10% bands from 90-100% down to 30-39%, with grade 8 for marks below 30%.

Are these official State Examinations Commission questions?

No. These are original OpenExamPrep single-best-answer concept questions modelled on the NCCA specification strands. The SEC publishes official past papers, marking schemes and IIS briefs separately; you should also practise full written papers and complete your own investigative study.