Basic Education Certificate Examination · Integrated Science

Living Things and Life Processes

35 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 35 questions

  1. Which cellular organelle is responsible for generating aerobic chemical energy (ATP) in eukaryotic cells?
  2. Which of the following cellular structures is present in plant cells but strictly absent in animal cells?
  3. What is the primary green pigment in plant leaves that absorbs sunlight for photosynthesis?
  4. Which gas is released into the atmosphere as a major byproduct of the light reaction of photosynthesis?
  5. By which physical process do water molecules move across a selectively permeable membrane from higher to lower water potential?
  6. What is the basic functional filtering unit of the human kidney responsible for producing urine?
  7. Which blood vessels have thick, muscular, elastic walls and carry oxygenated blood away from the heart at high pressure?
  8. Which chamber of the human heart has the thickest muscular wall to pump blood to all parts of the systemic body?
  9. Which human digestive enzyme secreted in saliva breaks down complex starch into maltose sugars?
  10. What acid is naturally produced in the human stomach to kill ingested bacteria and activate protein-digesting enzymes?
  11. Which component of human blood is primarily responsible for forming clots to prevent excessive bleeding from wounds?
  12. Which stage in the complete metamorphosis life cycle of the housefly is the non-feeding resting pupal stage?
  13. Which insect vector is responsible for transmitting the Plasmodium protozoan parasite that causes malaria?
  14. What is the smallest subatomic particle in an atom that carries a unit negative electrical charge?
  15. The atomic number of an element is defined as the total number of which subatomic particles in the nucleus of its atom?
  16. Which of the following substances is a pure chemical compound rather than a physical mixture?
  17. What separation technique is most suitable for recovering pure common salt from a clear salt-water solution?
  18. What colour does blue litmus paper turn when dipped into an aqueous acidic solution such as dilute hydrochloric acid?
  19. A chemical solution with a pH value of 11.5 is classified as being:
  20. What type of chemical reaction takes place when an acid reacts with a base to form a salt and water only?
  21. Which non-metal is unique among all non-metallic elements for being a liquid at standard room temperature and pressure?
  22. Which property allows gold and copper to be hammered into very thin sheets without breaking?
  23. What term describes the ability of metals such as copper and aluminium to be drawn out into long, thin electrical wires?
  24. What gas is produced when a reactive metal like zinc reacts with dilute hydrochloric acid?
  25. What test is used to confirm the presence of carbon dioxide gas in a school laboratory experiment?
  26. What gas extinguishes a burning splint and is confirmed when it relights a glowing splint?
  27. Which of the following physical processes represents a chemical change rather than a physical change?
  28. What two environmental factors must be simultaneously present for the rusting of iron to occur?
  29. Which of the following methods provides protective corrosion prevention by coating iron with a thin layer of zinc?
  30. What is the biological term for the involuntary wave-like muscular contractions that push food along the human alimentary canal?
  31. Which organ in the human body secretes bile, a fluid that emulsifies fats during digestion?
  32. Which vitamin is essential for human blood clotting, where a deficiency causes prolonged hemorrhaging from minor cuts?
  33. A deficiency of Vitamin C in the human diet causes which nutritional disease characterized by bleeding gums and poor wound healing?
  34. Which nutritional disease in young children is caused primarily by severe protein deficiency, causing a swollen abdomen and edema?
  35. What iodine-containing hormone is produced by the thyroid gland to regulate cellular basal metabolic rate in humans?

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