PES SS1 Biology (Obj) 2nd Term Exam 2025/2026
  • 1. Which part of the cell controls its activities?
A) Nucleus
B) Cell membrane
C) Cytoplasm
D) Mitochondria
  • 2. The jelly-like substance inside the cell is called
A) Vacuole
B) Ribosome
C) Nucleus
D) Cytoplasm
  • 3. The cell membrane is responsible for
A) Storing food
B) Controlling what enters and leaves the cell
C) Producing energy
D) Making proteins
  • 4. Which structure is only found in plant cells?
A) Nucleus
B) Mitochondria
C) Cell wall
D) Cytoplasm
  • 5. When a plant cell is placed in a hypotonic solution, it becomes
A) Turgid
B) Plasmolysed
C) Dead
D) Flaccid
  • 6. When a red blood cell is placed in distilled water, it will
A) Burst
B) Harden
C) Shrink
D) Remain the same
  • 7. Which of the following is used to kill micro-organisms on inanimate objects?
A) Vaccine
B) Disinfectant
C) Antibiotics
D) Antiseptics
  • 8. The process of heating milk to kill harmful bacteria is called
A) Fermentation
B) Sterilization
C) Pasteurization
D) Distillation
  • 9. Vaccination helps to
A) Destroy viruses directly
B) Prevent diseases by building immunity
C) Cure diseases instantly
D) Kill all micro-organisms
  • 10. Culturing in biology means
A) Growing micro-organisms under controlled conditions
B) Killing micro-organisms
C) Freezing micro-organisms
D) Drying micro-organisms
  • 11. Which of the following is a solid culture medium?
A) Broth
B) Oil
C) Water
D) Agar
  • 12. A Petri dish is used to
A) Store micro-organisms
B) Grow micro-organisms
C) Observe micro-organisms
D) Kill micro-organisms
  • 13. The process of transferring micro-organisms from one medium to another is called
A) Sterilization
B) Inoculation
C) Filtration
D) Incubation
  • 14. The skeleton is made up of
A) Bones and cartilage
B) Blood and tissues
C) Muscles only
D) Bones only
  • 15. The vertebral column protects the
A) Brain
B) Lungs
C) Spinal cord
D) Heart
  • 16. Muscles are attached to bones by
A) Ligaments
B) Joints
C) Muscles
D) Tendons
  • 17. Which type of joint is found in the shoulder?
A) Hinge joint
B) Pivot joint
C) Ball and socket joint
D) Fixed joint
  • 18. The elbow joint is an example of
A) Pivot joint
B) Hinge joint
C) Fixed joint
D) Ball and socket joint
  • 19. The study of crop plants is part of
A) Genetics
B) Zoology
C) Botany
D) Ecology
  • 20. Which of the following is a biological method of pest control?
A) Use of natural predators
B) Use of machines
C) Use of chemicals
D) Use of fire
  • 21. Which of the following is an example of a useful micro-organism in agriculture?
A) Parasite
B) Bacteria
C) Virus
D) Fungus
  • 22. Which of the following practices is based on biological knowledge?
A) Irrigation
B) Building farmhouses
C) Use of pesticides
D) Breeding and pest control
  • 23. The main substance broken down during respiration is
A) Vitamins
B) Glucose
C) Fat
D) Protein
  • 24. The gas taken in during aerobic respiration is
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Hydrogen
  • 25. The energy released during respiration is stored in
A) ATP
B) DNA
C) Water
D) RNA
  • 26. The organelle where most respiration occurs is
A) Vacuole
B) Mitochondrion
C) Ribosome
D) Nucleus
  • 27. In humans, anaerobic respiration produces
A) Water
B) Carbon dioxide
C) Lactic acid
D) Alcohol
  • 28. Which of the following releases the most energy?
A) Anaerobic respiration
B) Diffusion
C) Aerobic respiration
D) Fermentation
  • 29. Growth in living organisms is defined as
A) Reproduction
B) Getting bigger
C) Movement from place to place
D) Increase in size and complexity
  • 30. Growth is a result of
A) Movement
B) Cell death
C) Cell division and enlargement
D) Respiration
  • 31. Irritability is the ability of an organism to
A) Respond to stimuli
B) Move randomly
C) Reproduce
D) Grow rapidly
  • 32. A stimulus is
A) A tissue
B) A nutrient
C) Any change in the environment
D) A type of cell
  • 33. Which of the following is an example of irritability?
A) A baby increasing in weight
B) A seed germinating
C) A person sweating in heat
D) A plant growing taller
  • 34. Response in biology refers to
A) Growth of organisms
B) Feeding
C) Reaction to a stimulus
D) Reproduction
  • 35. In which solution will there be no net movement of water?
A) Hypotonic
B) Isotonic
C) Hypertonic
D) Concentrated
  • 36. The environment surrounding a cell affects
A) Its survival and function
B) Only its shape
C) Only its size
D) Nothing
  • 37. The shrinkage of a plant cell in a hypertonic solution is called
A) Dehydration
B) Diffusion
C) Plasmolysis
D) Turgidity
  • 38. Which method uses high temperature to destroy micro-organisms?
A) Filtration
B) Boiling
C) Freezing
D) Drying
  • 39. A substance used to grow micro-organisms is called
A) Indicator
B) Catalyst
C) Reagent
D) Medium
  • 40. The period during which micro-organisms grow in a controlled environment is called
A) Incubation
B) Fermentation
C) Sterilization
D) Inoculation
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