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100+ Free Wales GCSE Integrated Science Practice Questions

Prepare for the Made-for-Wales GCSE Integrated Science (Single Award) (WJEC) exam with instant access — no signup required.

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2026 Statistics

Key Facts: Wales GCSE Integrated Science Exam

45% / 45% / 10%

Unit 1 + Unit 2 + Unit 3 weightings

WJEC GCSE Integrated Science Single Award specification (teaching from 2026)

1h 30m × 2

Official written exam timings for Units 1 and 2

WJEC specification summary of assessment

72 + 72 + 28

Marks for Units 1, 2 and 3

WJEC specification

A*–G

Wales GCSE grading scale (Higher A*–D; Foundation C–G)

Qualifications Wales Made-for-Wales GCSE policy / WJEC specification

£46.80

2026/27 full single-award centre entry fee

WJEC Entry Fees 2026/27

3450QS

Qualification reference code

WJEC subject page

Sept 2026

First teaching (Wave 2 Made-for-Wales)

WJEC / Qualifications Wales

Not A-level feeder

Specification: not designed for progression to AS/A level Science

WJEC specification §1.3 Prior learning and progression

WJEC Made-for-Wales GCSE Integrated Science Single Award (3450QS): Unit 1 Living on Earth 45% + Unit 2 Science in a Changing World 45% + Unit 3 Scientific Enquiry 10%. Tiered written units; Unit 3 practical+written not tiered. First teaching Sept 2026; first award 2028. A*–G. Centre entry fee £46.80 (2026/27). Less content than double award; not designed for AS/A level Science progression. Free practice here is an MCQ study adaptation.

Sample Wales GCSE Integrated Science Practice Questions

Try these sample questions to test your Wales GCSE Integrated Science exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the main role of enzymes in digestion?
A.They provide energy for muscle contraction
B.They transport oxygen in the blood
C.They act as biological catalysts that speed up the breakdown of food molecules
D.They store genetic information in chromosomes
Explanation: Enzymes are biological catalysts that speed up chemical reactions, including the digestion of large food molecules into smaller soluble products. They are not primarily energy sources, oxygen carriers or genetic material.
2According to the lock-and-key model, why is an enzyme specific for a substrate?
A.The enzyme changes permanently after every reaction
B.The active site has a complementary shape to the substrate
C.The substrate destroys the enzyme after binding
D.All enzymes work on every type of food molecule
Explanation: In the lock-and-key model, the active site’s shape is complementary to a particular substrate, so only that substrate binds effectively. Enzymes are not permanently destroyed by normal catalysis and are substrate-specific.
3A learner investigates how temperature affects catalase activity by measuring oxygen volume produced from hydrogen peroxide. At 80 °C the volume is much lower than at 37 °C. What is the best explanation?
A.The enzyme was denatured so the active site shape changed
B.The substrate concentration increased at 80 °C
C.Oxygen gas cannot exist above 37 °C
D.All collisions stopped completely at 80 °C
Explanation: High temperatures can denature enzymes by permanently altering the active site shape so the substrate no longer fits well. Reaction rate falls even though molecules still collide.
4Which mineral is especially important for strong bones and teeth and is listed as essential for physical activity in the Made-for-Wales Integrated Science content?
A.Calcium
B.Sodium only as table salt flavouring
C.Iodine only for hair colour
D.Lead
Explanation: Calcium is essential for bone and tooth strength and is among minerals highlighted for physical activity (with potassium and magnesium). Lead is toxic, not a required dietary mineral for performance.
5Word equation for aerobic respiration in humans is best written as:
A.glucose → lactic acid + energy
B.carbon dioxide + water → glucose + oxygen
C.glucose + oxygen → carbon dioxide + water (+ energy/ATP)
D.protein + oxygen → urea only
Explanation: Aerobic respiration uses glucose and oxygen to produce carbon dioxide, water and energy (ATP). Lactic acid is associated with anaerobic respiration in humans; photosynthesis is the reverse-looking process in plants.
6Why is anaerobic respiration less efficient than aerobic respiration for producing ATP in humans?
A.It produces far less ATP per glucose and forms lactic acid
B.It uses more oxygen per glucose molecule
C.It only occurs in plant cells
D.It requires mitochondria and always produces water
Explanation: Anaerobic respiration in humans converts glucose to lactic acid and yields much less ATP per glucose than aerobic respiration. It does not use oxygen.
7Which blood component is mainly responsible for transporting oxygen?
A.Red blood cells
B.Platelets
C.Plasma proteins only
D.White blood cells
Explanation: Red blood cells contain haemoglobin that binds oxygen for transport. Platelets aid clotting; white cells fight infection; plasma carries dissolved substances.
8Arteries, veins and capillaries differ in function. Which statement is correct?
A.Arteries always carry deoxygenated blood and have valves throughout
B.Capillaries have thin walls for exchange of substances with tissues
C.Veins always carry blood at the highest pressure from the heart
D.Capillaries are thicker-walled than arteries to withstand pressure
Explanation: Capillaries have very thin walls (one cell thick) to allow exchange of gases, nutrients and wastes with tissues. Arteries carry blood away from the heart under higher pressure; veins return blood and often have valves.
9A runner’s speed–time graph is a straight line rising from 0 to 8 m/s in 4 s. What is the acceleration?
A.0.5 m/s²
B.2 m/s²
C.32 m/s²
D.4 m/s²
Explanation: Acceleration = change in velocity / time = (8 − 0) / 4 = 2 m/s². On a speed–time graph, gradient equals acceleration.
10Distance travelled on a speed–time graph is found from:
A.The maximum speed only
B.The intercept on the speed axis only
C.The area under the graph
D.The number of data points plotted
Explanation: Distance (or displacement magnitude for constant direction) equals the area under a speed–time graph. Gradient gives acceleration.

About the Wales GCSE Integrated Science Exam

Made-for-Wales GCSE Integrated Science (Single Award) is the WJEC qualification designed for the Curriculum for Wales (first teaching September 2026, Wave 2). It is regulated by Qualifications Wales and is not available to centres in England. It provides a broad, integrated understanding of biology, chemistry and physics concepts with less content than The Sciences Double Award, and is explicitly not designed for progression to AS or A level Science. Assessment is unitised: Unit 1 Living on Earth (written exam with pre-release, 45%), Unit 2 Science in a Changing World (written exam, 45%) and Unit 3 Scientific Enquiry (practical + written, 10%). Units 1–2 are tiered (Higher A*–D; Foundation C–G); Unit 3 is not tiered. Grades use the Wales A*–G scale. Assessments are available in English and Welsh. DISCLOSURE: Official papers mix structured, short, extended, data and practical-enquiry responses — this free bank is an English-language MCQ study adaptation for revision, not a past-paper clone.

Assessment

Unitised single-award GCSE. Unit 1 Living on Earth 45% (72 marks, 1h 30m, pre-release, tiered); Unit 2 Science in a Changing World 45% (72 marks, 1h 30m, tiered); Unit 3 Scientific Enquiry 10% (28 marks: practical 6 + written 22, not tiered). Higher tier A*–D; Foundation C–G for Units 1–2. Qual code 3450QS; Approval Number C00/5167/2. First teaching September 2026; Unit 1 from summer 2027; Units 2–3 and first award from 2028. Not designed for progression to AS/A level Science (unlike The Sciences Double Award).

Time Limit

Unit 1: 1 hour 30 minutes; Unit 2: 1 hour 30 minutes; Unit 3: practical 1 hour + written 1 hour

Passing Score

A*–G overall grade (Wales GCSE scale); Higher A*–D and Foundation C–G for tiered units

Exam Fee

£46.80 centre entry fee for the full single-award Made-for-Wales GCSE (WJEC 2026/27 fees). Paid by the school/centre — learners do not typically pay a separate public exam fee. (WJEC (regulated by Qualifications Wales))

Wales GCSE Integrated Science Exam Content Outline

45%

Unit 1: Living on Earth

Healthy body (enzymes, diet, respiration, cardiovascular system, motion, disease causes/defence/management); Earth's resources (energy conservation, photosynthesis, food webs, electricity generation/distribution/storage, separating materials, reactions and rates); transport (fuels, pollution, EVs, efficiency, stopping distances). Pre-release Resource Folder one month before exam

45%

Unit 2: Science in a Changing World

Human influence (biodiversity, farming impacts, LCA, plastics, climate change, carbon cycle, carbon footprints); humans in space (weight/mass, forces, DNA/mutations from radiation, solar system, space nutrition and materials, waves, satellites/telescopes); looking for clues (separation, chromatography/Rf, gas and ion tests, DNA profiling, biochemical tests, density)

10%

Unit 3: Scientific Enquiry

One of two WJEC-set enquiries: Task 1 group practical (observation, measurement, reliable data) 6 marks; Task 2 independent written task 22 marks assessing scientific enquiry skills SE1–SE8. Not tiered

How to Pass the Wales GCSE Integrated Science Exam

What You Need to Know

  • Passing score: A*–G overall grade (Wales GCSE scale); Higher A*–D and Foundation C–G for tiered units
  • Assessment: Unitised single-award GCSE. Unit 1 Living on Earth 45% (72 marks, 1h 30m, pre-release, tiered); Unit 2 Science in a Changing World 45% (72 marks, 1h 30m, tiered); Unit 3 Scientific Enquiry 10% (28 marks: practical 6 + written 22, not tiered). Higher tier A*–D; Foundation C–G for Units 1–2. Qual code 3450QS; Approval Number C00/5167/2. First teaching September 2026; Unit 1 from summer 2027; Units 2–3 and first award from 2028. Not designed for progression to AS/A level Science (unlike The Sciences Double Award).
  • Time limit: Unit 1: 1 hour 30 minutes; Unit 2: 1 hour 30 minutes; Unit 3: practical 1 hour + written 1 hour
  • Exam fee: £46.80 centre entry fee for the full single-award Made-for-Wales GCSE (WJEC 2026/27 fees). Paid by the school/centre — learners do not typically pay a separate public exam fee.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Wales GCSE Integrated Science Study Tips from Top Performers

1Learn integrated themes, not isolated subjects — health, resources, transport, climate, space and identification blend biology, chemistry and physics
2Practise interpreting tables, graphs, rates and energy calculations (speed, efficiency, kWh cost, density, Rf, carbon footprint)
3Embed scientific enquiry skills (variables, reliability, evaluation, conclusions) in every topic — they are assessed in all units and dominate Unit 3
4For Unit 1, when the pre-release Resource Folder arrives, annotate data and practice applying specification content to the context
5Rehearse practical techniques: enzyme investigations, sampling, flame/gas tests, chromatography, density measurements
6Know the progression message: this single award is not designed as the main route to AS/A level Science — plan post-16 options accordingly
7Use official WJEC specification, Guidance for Teaching and Sample Assessment Materials when published — match command words and mark schemes

Frequently Asked Questions

Is Made-for-Wales GCSE Integrated Science the same as England GCSE Combined Science?

No. This is a WJEC qualification regulated by Qualifications Wales for centres in Wales (not available to centres in England). It uses the A*–G grade scale and a three-unit structure with a dedicated Scientific Enquiry unit. England combined science GCSEs use AQA, OCR or Edexcel boards and the 9–1 scale.

How does Integrated Science Single Award differ from The Sciences Double Award?

Integrated Science is a single-award GCSE with less content than The Sciences Double Award. WJEC states it is designed for learners who benefit from a broader but lighter science GCSE and is not designed for progression to AS or A level Science qualifications. The Sciences Double Award is the pathway intended to support progression to post-16 science study.

How is the Made-for-Wales GCSE Integrated Science assessed?

Unit 1 Living on Earth is a tiered written exam of 1 hour 30 minutes (45%, 72 marks) with a pre-release Resource Folder. Unit 2 Science in a Changing World is a tiered written exam of 1 hour 30 minutes (45%, 72 marks). Unit 3 Scientific Enquiry is an external practical (1 hour, 6 marks) plus written task (1 hour, 22 marks) worth 10%, and is not tiered. Assessment objectives weight approximately AO1 25%, AO2 50%, AO3 25%.

Does this free practice test match the official exam format?

No. Official Units 1–2 are not pure multiple-choice and include structured responses and data work with pre-release material on Unit 1. Unit 3 is a practical-plus-written enquiry assessment. This bank is an English-language MCQ study adaptation to build topic knowledge, enquiry reasoning and data skills — use it alongside WJEC SAMs, practical work and the official pre-release workflow when available.

How much does the exam cost?

WJEC’s 2026/27 centre entry fee for a full single-award Made-for-Wales GCSE (including Integrated Science) is £46.80. This is paid by the school or centre. Learners in typical school provision do not pay a separate public candidate fee for entry.

What languages is the qualification available in?

Assessments are available in English and Welsh (Cymraeg), consistent with other Made-for-Wales GCSEs offered by WJEC.

When was first teaching and when is the first award?

First teaching is September 2026. Unit 1 is first available in summer 2027; Unit 2 is first available in summer 2028; Unit 3 is available in the spring term from 2028. The first award of the full qualification is 2028. Unit 3 should be taken in the final year of study.

What are the tiers of entry?

Units 1 and 2 are tiered: Higher Tier grades A*–D and Foundation Tier grades C–G. Learners may be entered at different tiers across units. Unit 3 Scientific Enquiry is not tiered.