Free Practice Questions for PNG Grade 10 Science

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Sample PNG Grade 10 Science Practice Questions

Try these sample questions to review concepts for the PNG Grade 10 Science exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which organelle is primarily responsible for generating adenosine triphosphate (ATP) through aerobic cellular respiration in eukaryotic cells?

A.Mitochondrion

B.Ribosome

C.Chloroplast

D.Golgi apparatus

Explanation: Mitochondria are often referred to as the powerhouses of the cell because they carry out cellular respiration, breaking down glucose in the presence of oxygen to synthesize ATP. Ribosomes are responsible for protein synthesis, chloroplasts conduct photosynthesis in plant cells, and the Golgi apparatus packages and modifies proteins for secretion or transport.

2Which cellular structure is present in plant cells but absent in typical animal cells?

A.Mitochondrion

B.Cellulose cell wall

C.Plasma membrane

D.Ribosome

Explanation: Plant cells possess an extracellular structural layer called the cell wall composed primarily of cellulose, which maintains turgor pressure and structural rigidity. Both plant and animal cells contain mitochondria, plasma membranes, and ribosomes.

3What is the primary function of the selectively permeable plasma membrane in living cells?

A.Synthesizing starch molecules from carbon dioxide and sunlight

B.Replicating and storing nuclear DNA molecules

C.Regulating the passage of ions and molecules into and out of the cell

D.Breaking down cellular debris through acidic hydrolytic enzymes

Explanation: The plasma membrane is selectively permeable, allowing necessary nutrients such as water, glucose, and oxygen to enter while waste products exit and harmful substances are excluded. This dynamic barrier maintains cellular homeostasis. DNA replication occurs in the nucleus, starch synthesis occurs in chloroplasts, and enzymatic waste breakdown is handled by lysosomes.

4What are the chemical reactants required by green plants to perform photosynthesis?

A.Carbon dioxide and water

B.Glucose and oxygen

C.Carbon monoxide and nitrogen

D.Maltose and hydrogen

Explanation: Photosynthesis requires carbon dioxide absorbed from the atmosphere through leaf stomata and water taken up by root systems from the soil. In the presence of sunlight and chlorophyll, these inorganic reactants are converted into glucose and oxygen gas.

5How do the overall chemical equations of aerobic cellular respiration and photosynthesis relate to each other?

A.Both processes consume glucose and oxygen to release carbon dioxide and water.

B.Both processes release oxygen, but only respiration stores light energy in glucose.

C.Photosynthesis uses glucose and oxygen to produce the carbon dioxide needed for respiration.

D.The chemical products of photosynthesis serve as the primary reactants for aerobic respiration.

Explanation: Photosynthesis and aerobic cellular respiration form a complementary biochemical cycle. Photosynthesis converts carbon dioxide and water into glucose and oxygen using light energy, whereas cellular respiration consumes glucose and oxygen to release carbon dioxide, water, and ATP.

6During intense physical activity when skeletal muscle cells experience oxygen debt, which anaerobic pathway occurs and what byproduct accumulates?

A.Alcoholic fermentation producing ethanol and carbon dioxide

B.Lactic acid fermentation producing lactate

C.Photolysis producing hydrogen peroxide

D.Oxidative phosphorylation producing excess citric acid

Explanation: Reduction of pyruvate to lactate regenerates NAD+ so that glycolysis can continue supplying ATP during intense exercise. Lactate can subsequently be used as fuel or converted to glucose; it is not the cause of delayed muscle soreness, and exercise fatigue has several contributing mechanisms.

7Through which microscopic epidermal pores on plant leaves does gas exchange primarily take place?

A.Xylem tracheids

B.Phloem sieve plates

C.Stomata controlled by guard cells

D.Lenticels on mature root tips

Explanation: Stomata are microscopic pores located primarily on the lower epidermis of leaves, each bordered by a pair of specialized guard cells. Guard cells swell or shrink to regulate the uptake of carbon dioxide for photosynthesis and the transpirational loss of water vapor.

8Which blood vessels have thick muscular and elastic walls that carry blood under high pressure away from the heart?

A.Capillaries

B.Veins

C.Arteries

D.Venules

Explanation: Arteries carry blood away from the ventricles of the heart under high systolic pressure. Their thick walls contain smooth muscle and elastic fibers that expand and recoil to maintain a steady flow of blood throughout systemic and pulmonary circulation.

9Which chamber of the human heart possesses the thickest muscular wall to pump oxygenated blood through the aorta into systemic circulation?

A.Right atrium

B.Right ventricle

C.Left atrium

D.Left ventricle

Explanation: The left ventricle pumps blood through the aorta to the systemic circulation. Its thicker muscular wall generates the higher pressure needed for that circuit, compared with the lower-pressure pulmonary circuit served by the right ventricle.

10Which component of human blood contains the iron-bearing protein hemoglobin and is primarily responsible for oxygen transport?

A.Red blood cells (erythrocytes)

B.White blood cells (leukocytes)

C.Platelets (thrombocytes)

D.Blood plasma

Explanation: Erythrocytes (red blood cells) are biconcave, anucleated discs loaded with millions of hemoglobin molecules. Hemoglobin binds oxygen reversibly in the alveolar capillaries of the lungs to form oxyhemoglobin, transporting it to metabolically active tissues.

About the PNG Grade 10 Science Exam

Independent English-language MCQ practice for PNG Grade 10 Science. Biological, chemical, physical, and earth-and-space science concepts with numerical applications. The official curriculum also develops scientific inquiry; this bank has selected conceptual coverage rather than a complete practical programme. This is independent English-language MCQ study practice. It is not an official translation, format simulation, or substitute for writing, speaking, practical, or performance assessment. Passages, resource-booklet extracts, datasets, and policy scenarios written for these exercises are illustrative unless a named primary source is identified. They are not the actual 2026 paper or resource booklet.

Exam sponsor: Department of Education, Measurement Services Division (MSD). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written Science national examination. The 2026 item mix, duration, and question count were not verified. Scientific inquiry includes investigations and practical work. The official 2025 MSD calendar explicitly required compulsory Science practical marks. Complete the practical and internal assessment required by your school, and confirm the 2026 arrangements. A separate 2026 national practical or oral paper was not verified.

Time Limit

2026 per-paper duration not verified; confirm current instructions

Passing Score

No universal 2026 pass mark verified; confirm current certification and selection requirements

Exam / Certification Fees

Official fee not verified; confirm with your school or MSD

Exam sponsor website

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

Official sources

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.

25 study questions; official weight not verified

Biological Science

Selected independent practice in biological science. These are editorial study groupings, not official blueprint allocations.

25 study questions; official weight not verified

Chemical Science

Selected independent practice in chemical science. These are editorial study groupings, not official blueprint allocations.

25 study questions; official weight not verified

Physical Science

Selected independent practice in physical science. These are editorial study groupings, not official blueprint allocations.

25 study questions; official weight not verified

Earth And Space Science

Selected independent practice in earth and space science. These are editorial study groupings, not official blueprint allocations.

Preparing for the PNG Grade 10 Science Exam

What You Need to Know

Passing score: No universal 2026 pass mark verified; confirm current certification and selection requirements
Assessment: Written Science national examination. The 2026 item mix, duration, and question count were not verified. Scientific inquiry includes investigations and practical work. The official 2025 MSD calendar explicitly required compulsory Science practical marks. Complete the practical and internal assessment required by your school, and confirm the 2026 arrangements. A separate 2026 national practical or oral paper was not verified.
Time limit: 2026 per-paper duration not verified; confirm current instructions
Exam / certification fees: Official fee not verified; confirm with your school or MSD Official sources

Using Our Practice Resources

Work through all 100 available questions
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PNG Grade 10 Science: Suggested Study Strategy

1Use equations with units and explain each calculation.

2Practise interpreting results and planning fair investigations with your teacher.

3Distinguish simplified classroom models from universal scientific laws.

Frequently Asked Questions

When is the 2026 assessment scheduled?

The Department’s 2026 calendar lists 5–9 October 2026 for this assessment or its grade-level examination window. Follow your school’s subject timetable.

What is the official assessment format?

Written Science national examination. The 2026 item mix, duration, and question count were not verified.

What language and eligibility information was verified?

Official curriculum resources are published in English, but a current examination-specific response-language policy was not verified. Confirm permitted response languages with your school or MSD. This practice bank uses English. This is a Grade 10 school assessment administered through nominated candidates and registered subject choices, rather than an unrestricted public certification test. Confirm nomination, schoolwork, and any FODE pathway requirements with the school or provider.

What other assessment work is required?

Scientific inquiry includes investigations and practical work. The official 2025 MSD calendar explicitly required compulsory Science practical marks. Complete the practical and internal assessment required by your school, and confirm the 2026 arrangements. A separate 2026 national practical or oral paper was not verified.

What are the fee, duration, question count, and pass mark?

A current official per-paper fee, duration, item count, and universal pass mark were not verified as of 7 October 2026. Confirm them with your school or MSD; tuition-subsidy policy alone does not establish a zero examination fee.

How should this English-language MCQ bank be used?

This is independent English-language MCQ study practice. It is not an official translation, format simulation, or substitute for writing, speaking, practical, or performance assessment. Passages, resource-booklet extracts, datasets, and policy scenarios written for these exercises are illustrative unless a named primary source is identified. They are not the actual 2026 paper or resource booklet.