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Exam Review

Key Facts: CSEC Integrated Science Exam

60 items

Paper 01 multiple-choice items

CXC CSEC Integrated Science Syllabus

75 minutes

Paper 01 duration

CXC CSEC Integrated Science Syllabus

3 sections

Core syllabus sections

CXC 23/G/SYLL 23

20%

School-Based Assessment weighting

CXC CSEC Integrated Science Syllabus

BBD $49.00

CXC base subject fee

CXC Scale of Fees

CSEC Integrated Science combines Paper 01 (60 MCQs, 30%), Paper 02 (six compulsory written questions, 50%), and Paper 031 SBA or Paper 032 alternative practical (20%). OpenExamPrep provides independent English-language MCQ study for life processes, energy and our planet. This is not an official translation, a complete format simulation, or a substitute for written-response and practical laboratory work.

Sample CSEC Integrated Science Practice Questions

Try these sample questions to review concepts for the CSEC Integrated Science exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 82+ question experience with AI tutoring.

1Which set of cellular organelles is present in typical photosynthetic plant cells but absent in typical animal cells?
A.Cell wall, large permanent vacuole, and chloroplasts
B.Cell membrane, mitochondria, and ribosomes
C.Nucleus, cytoplasm, and endoplasmic reticulum
D.Centrioles, lysosomes, and small temporary vacuoles
Explanation: Photosynthetic plant cells possess a cellulose cell wall for structural support, a large central permanent vacuole for cell turgor, and chloroplasts containing chlorophyll for photosynthesis. Animal cells lack a cell wall and chloroplasts, and usually possess only small, temporary vacuoles.
2A concentrated crystal of potassium manganate(VII) is dropped into a beaker of still water. Over several hours, the purple color spreads evenly throughout the liquid without stirring. Which process causes this observation?
A.Osmosis of water molecules across a selectively permeable barrier
B.Diffusion of solute particles down a concentration gradient
C.Active transport driven by chemical energy from dissolved oxygen
D.Evaporation of surface water molecules into the surrounding air
Explanation: Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration down a concentration gradient as a result of their random thermal kinetic motion. In the beaker, potassium manganate(VII) particles naturally disperse until evenly distributed.
3Fresh potato cylinders are immersed in a concentrated 20% sucrose solution for two hours. What change in mass and firmness will the potato cylinders exhibit, and why?
A.Gain mass and become turgid because water enters the cells by osmosis
B.Lose mass and become flaccid because water leaves the cells by osmosis
C.Maintain constant mass because sucrose molecules diffuse freely into the cells
D.Gain mass because sucrose is actively pumped into the potato tissue
Explanation: A 20% sucrose solution has a lower water potential (hypertonic) than the potato cell sap. Water moves out of the potato cells by osmosis down the water potential gradient across the selectively permeable cell membranes, causing the cells to lose water, shrink, and become flaccid, resulting in a net loss of mass.
4Why are antibiotics effective in treating bacterial infections like strep throat but completely ineffective against viral diseases such as influenza and dengue?
A.Antibiotics target bacterial cell walls and metabolic machinery absent in non-cellular viruses.
B.Antibiotics kill microbes only while they are outside human cells.
C.Antibiotics neutralize bacterial toxins rather than acting on the bacteria themselves.
D.Antibiotics stimulate antibodies against bacteria but cannot stimulate antibodies against viruses.
Explanation: Antibiotics target specific biochemical structures and pathways unique to bacteria, such as peptidoglycan cell wall synthesis, 70S bacterial ribosomes, or bacterial DNA replication. Viruses lack bacterial cell walls, ribosomes, and independent metabolic pathways, relying entirely on the host cell's machinery, so antibiotics have no target.
5Which feature is a defining biological characteristic of asexual reproduction in organisms?
A.Offspring develop from a single parent without the fusion of gametes.
B.Offspring inherit distinct combinations of maternal and paternal chromosomes via meiosis.
C.Offspring exhibit extensive genetic variation that facilitates rapid natural selection.
D.Offspring require two haploid gametes that unite during fertilization.
Explanation: Asexual reproduction involves one parent and no fusion of gametes. Many forms, such as budding and vegetative propagation, produce genetically identical offspring. Parthenogenesis is also asexual because an unfertilized egg develops without gamete fusion.
6Which combination of structural features is typically found in flowers adapted for wind pollination rather than insect pollination?
A.Large feathery stigmas, dangling stamens, and light, smooth pollen grains
B.Large brightly colored petals, sweet nectar glands, and heavy spiky pollen
C.Strong sweet floral scents, sticky stigmas enclosed inside the petals, and bright nectar guides
D.Fused tubular corollas, upright stamens, and sticky viscous pollen masses
Explanation: Wind-pollinated flowers have pendulous stamens that hang outside the flower to release light, smooth pollen into passing air currents, and large feathery stigmas with high surface area to trap airborne pollen grains. They lack bright petals, scents, and nectar because they do not attract animal pollinators.
7What is the primary physiological role of progesterone during the second half (luteal phase) of the human menstrual cycle?
A.Stimulating the pituitary gland to release a surge of luteinizing hormone (LH)
B.Maintaining and vascularizing the thickened uterine lining for possible embryo implantation
C.Triggering the breakdown and shedding of the endometrium during menstruation
D.Promoting the rapid maturation of primary ovarian follicles in the ovary
Explanation: Following ovulation, the corpus luteum secretes progesterone. Progesterone maintains the vascularized, glandular endometrium of the uterus, preparing it to nourish and support an implanted embryo. If pregnancy does not occur, progesterone levels fall, causing menstruation.
8Which method of contraception provides the dual benefit of preventing pregnancy and reducing the transmission of Sexually Transmitted Infections (STIs) such as HIV and gonorrhea?
A.Latex male or female condoms
B.Oral hormonal contraceptive pills
C.Intrauterine devices (IUDs)
D.Surgical tubal ligation
Explanation: Condoms form a physical barrier that reduces the exchange of bodily fluids during intercourse, helping prevent pregnancy and infections such as HIV and gonorrhea. They provide less protection against infections spread through skin not covered by the condom, such as syphilis. Hormonal and surgical contraceptive methods do not provide STI protection.
9What are the essential raw materials required by green plants for photosynthesis, and what primary gas is released as a by-product?
A.Raw materials: carbon dioxide and water; released gas: oxygen
B.Raw materials: oxygen and glucose; released gas: carbon dioxide
C.Raw materials: nitrogen and water; released gas: methane
D.Raw materials: carbon dioxide and soil minerals; released gas: hydrogen
Explanation: During photosynthesis, green plant cells containing chlorophyll absorb light energy to convert carbon dioxide (absorbed from the atmosphere via stomata) and water (absorbed from soil via roots) into glucose and oxygen: 6CO2 + 6H2O -> C6H12O6 + 6O2. Oxygen is released into the air.
10A student tests a fruit juice sample for reducing sugars by adding Benedict's solution and heating the test tube in a boiling water bath. Which color progression indicates a strongly positive result?
A.Initial clear blue changes to green, then yellow, and forms a brick-red precipitate
B.Initial clear blue changes to a deep blue-black color
C.Initial pale blue turns to a distinct violet-purple hue
D.Initial clear solution forms an opaque white emulsion
Explanation: Benedict's solution contains copper(II) sulfate (blue). When heated with reducing sugars (such as glucose or maltose), the copper(II) ions are reduced to copper(I) oxide, forming a precipitate that progresses from green to yellow, orange, and finally a dense brick-red depending on sugar concentration.

About the CSEC Integrated Science Exam

For the 2026 examination, CXC syllabus CXC 23/G/SYLL 23 organizes Integrated Science into Organisms and Life Processes (Section A), Energy (Section B), and Our Planet (Section C). Paper 01 tests knowledge, comprehension and use of knowledge across these areas. This independent English-language MCQ bank provides 82 original study questions with explanations for correct and incorrect options. The complete CSEC assessment also requires written responses and practical work.

Exam sponsor: Caribbean Examinations Council (CXC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Paper 01: 60 MCQs (75 minutes, 30%). Paper 02: six compulsory questions (150 minutes, 50%); Question 1 is practical/investigative and worth 25 marks, with Questions 2–6 worth 15 marks each. Paper 031 SBA laboratory/fieldwork notebook or Paper 032 alternative practical (130 minutes, three compulsory questions) contributes 20%.

Time Limit

Paper 01: 75 minutes; Paper 02: 2 hours 30 minutes; Paper 032 alternative practical: 2 hours 10 minutes

Passing Score

Grades I to III (out of Grades I–VI) are recognized as passing grades at General Proficiency.

Exam / Certification Fees

BBD $49.00 subject fee plus BBD $48.50 candidate entry fee (local ministry and administrative fees vary by territory).

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.

No fixed Paper 01 section allocation published

Organisms and Life Processes (Section A)

Cells, reproduction and growth in plants and animals, transport, excretion, sense organs and coordination, and health and sanitation.

No fixed Paper 01 section allocation published

Energy (Section B)

Energy conservation, nutrition and other energy-related life processes, fossil fuels and alternatives, electricity and lighting, temperature control and ventilation.

No fixed Paper 01 section allocation published

Our Planet (Section C)

The universe and solar system, terrestrial environments, water, forces, metals and non-metals, household chemicals, and pollutants.

Preparing for the CSEC Integrated Science Exam

What You Need to Know

  • Passing score: Grades I to III (out of Grades I–VI) are recognized as passing grades at General Proficiency.
  • Assessment: Paper 01: 60 MCQs (75 minutes, 30%). Paper 02: six compulsory questions (150 minutes, 50%); Question 1 is practical/investigative and worth 25 marks, with Questions 2–6 worth 15 marks each. Paper 031 SBA laboratory/fieldwork notebook or Paper 032 alternative practical (130 minutes, three compulsory questions) contributes 20%.
  • Time limit: Paper 01: 75 minutes; Paper 02: 2 hours 30 minutes; Paper 032 alternative practical: 2 hours 10 minutes
  • Exam / certification fees: BBD $49.00 subject fee plus BBD $48.50 candidate entry fee (local ministry and administrative fees vary by territory). Official sources

Using Our Practice Resources

  • Work through all 82 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CSEC Integrated Science: Suggested Study Strategy

1Review the specific functions and differences between plant and animal cell organelles, with particular attention to cell walls, chloroplasts, and large central vacuoles.
2Practice scientific calculations with correct units, including work done (W = F × d), electrical power (P = V × I), energy consumption in kilowatt-hours (kWh), and mechanical advantage (MA = Load / Effort).
3Master the pathways of blood flow through the four chambers of the heart, the functions of major vessels (aorta, vena cava, pulmonary artery and veins), and the roles of blood components.
4Understand the conditions required for iron corrosion (water and oxygen) and the scientific mechanisms behind rust prevention methods like galvanizing and sacrificial protection.
5Memorize the formation conditions of tropical storms and hurricanes in the Atlantic basin, including sea surface temperatures above 26.5°C and the Coriolis effect.

Frequently Asked Questions

What is the format of CSEC Integrated Science Paper 01?

Paper 01 consists of 60 multiple-choice items in 75 minutes and contributes 30% of the total mark. It draws from all areas of the syllabus, with 45 items testing Knowledge and Comprehension and 15 testing Use of Knowledge. The syllabus applicable in 2026 does not specify a fixed number of items per section.

What is the difference between Paper 02 and Paper 03?

Paper 02 has six compulsory questions in 150 minutes and contributes 50%: a 25-mark practical/investigative question and five 15-mark questions. Paper 031 is the laboratory and fieldwork SBA notebook (20%). Private candidates may take Paper 031 or the Paper 032 alternative practical, which has three compulsory questions in 130 minutes and contributes the same 20%.

How are CSEC Integrated Science grades awarded?

CXC reports CSEC examination results using a 6-point grading scheme from Grade I (highest) to Grade VI. Grades I, II, and III at General Proficiency are recognized across the Caribbean and internationally as qualifying passes for secondary school certification, technical programs, and post-secondary studies.

What scientific disciplines are integrated within this subject?

CSEC Integrated Science blends core principles from biology, chemistry, physics, earth and space science, and environmental science, emphasizing their practical application to everyday living, community health, technology, and industry within Caribbean contexts.

How does OpenExamPrep's practice bank support exam preparation?

This independent bank provides 82 original English-language MCQs on life processes, energy, everyday mechanics and Earth systems. Each item explains the correct answer and distractors. Use it alongside written-response practice and laboratory investigations; it is not an official translation or a simulation of the complete assessment.