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Science Exam 2025 Revision

Immunity & Disease 1. What is a pathogen? A. A harmless organism living in the body B. Any organism or agent that causes disease C. A type of antibody in the blood D. A white blood cell Answer: B 2. Which of the following is not a type of pathogen? A. Virus B. Bacteria C. Fungi D. Vitamin Answer: D 3. What is an antigen? A. A molecule on a pathogen that triggers an immune response B. A protein released by white blood cells C. A vaccine injected into the body D. A type of antibiotic Answer: A 4. Where are antibodies found? A. In pathogens B. On the skin surface C. In the blood and lymph D. In the lungs Answer: C 5. Antibiotics are used to treat: A. Viral infections B. Bacterial infections C. Fungal infections only D. All diseases Answer: B 6. Which is a sign of infection? A. Low body temperature B. Redness and swelling C. No change in body function D. Decreased heart rate Answer: B 7. What is the microbiome? A. A group of pathogens B. Helpful microorganisms living in and on the body C. Lab-grown bacteria D. A type of immunity Answer: B 8. Which of the following is a parasite? A. Influenza virus B. Tapeworm C. E. coli D. Yeast Answer: B 9. A vector is: A. A person who gives medication B. An organism that spreads disease C. A type of bacteria D. A white blood cell Answer: B 10. Quarantine is used to: A. Increase transmission B. Prevent transmission C. Kill pathogens inside the body D. Strengthen immunity Answer: B Transmission & Body Defenses 11. Which is NOT a mode of disease transmission? A. Direct contact B. Airborne C. Radiation D. Vector-borne Answer: C 12. The first line of defense includes: A. Skin and mucous membranes B. Antibodies C. Vaccination D. White blood cells Answer: A 13. The second line of defense includes: A. Tears and saliva B. Fever and inflammation C. Memory cells D. Vaccines Answer: B 14. The third line of defense is: A. Non-specific immunity B. Specific immune response C. The skin D. Reflexes Answer: B 15. Natural active immunity occurs when: A. You get sick and recover B. You receive a vaccine C. You receive antibodies from your mother D. You are given an antibody injection Answer: A 16. Artificial passive immunity involves: A. Vaccines B. Breastfeeding C. Injection of antibodies D. Natural exposure to pathogens Answer: C Energy & Waves 17. A transverse wave moves: A. Parallel to the direction of energy B. Perpendicular to the direction of energy C. In circles D. Randomly Answer: B 18. Which is a longitudinal wave? A. Water wave B. Light C. Sound D. Radio wave Answer: C 19. Which is a property of sound waves? A. They travel fastest in gases B. They require a medium C. They are transverse D. They are part of the EM spectrum Answer: B 20. Which has the longest wavelength in the EM spectrum? A. X-rays B. Gamma rays C. Radio waves D. UV Answer: C 21. Reflection occurs when: A. A wave bends B. A wave changes speed C. A wave bounces off a surface D. A wave disappears Answer: C 22. Refraction is: A. Bending of light as it enters a new medium B. Light bouncing off a surface C. Production of new light D. Light absorbed by objects Answer: A 23. Dispersion is: A. Light spreading into colours B. Light bouncing C. Light travelling at constant speed D. Light being destroyed Answer: A 24. Conduction transfers heat through: A. Air movement B. Direct contact C. Empty space D. Radiation Answer: B 25. Which heat transfer occurs in fluids (liquids and gases)? A. Conduction B. Convection C. Reflection D. Radiation Answer: B Ecosystems 26. What is an ecosystem? A. Only plants B. All living things and their environment C. A group of the same species D. A food chain Answer: B 27. Population means: A. All organisms living in an ecosystem B. All organisms of one species in an area C. Non-living factors D. Decomposers only Answer: B 28. Producers are organisms that: A. Eat other organisms B. Break down dead matter C. Make their own food D. Consume only plants Answer: C 29. Which is a decomposer? A. Rabbit B. Wolf C. Bacteria D. Grass Answer: C 30. Random sampling is used when: A. The environment is uniform B. A specific pattern is needed C. Only one organism exists D. Samples must follow a straight line Answer: A

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