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100+ Free LC Ag Science Practice Questions

Leaving Certificate Agricultural Science practice questions are available now; exam metadata is being verified.

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2026 Statistics

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 test your LC Ag Science exam readiness. 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 Practice Questions

Verified exam format metadata for Leaving Certificate Agricultural Science is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.