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PES SS1 Biology (Obj) 2nd Term Exam 2025/2026
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  • 1. Which part of the cell controls its activities?
A) Cytoplasm
B) Cell membrane
C) Mitochondria
D) Nucleus
  • 2. The jelly-like substance inside the cell is called
A) Nucleus
B) Cytoplasm
C) Ribosome
D) Vacuole
  • 3. The cell membrane is responsible for
A) Making proteins
B) Storing food
C) Producing energy
D) Controlling what enters and leaves the cell
  • 4. Which structure is only found in plant cells?
A) Cell wall
B) Nucleus
C) Cytoplasm
D) Mitochondria
  • 5. When a plant cell is placed in a hypotonic solution, it becomes
A) Flaccid
B) Turgid
C) Dead
D) Plasmolysed
  • 6. When a red blood cell is placed in distilled water, it will
A) Harden
B) Shrink
C) Burst
D) Remain the same
  • 7. Which of the following is used to kill micro-organisms on inanimate objects?
A) Vaccine
B) Antiseptics
C) Antibiotics
D) Disinfectant
  • 8. The process of heating milk to kill harmful bacteria is called
A) Pasteurization
B) Distillation
C) Sterilization
D) Fermentation
  • 9. Vaccination helps to
A) Kill all micro-organisms
B) Destroy viruses directly
C) Prevent diseases by building immunity
D) Cure diseases instantly
  • 10. Culturing in biology means
A) Killing micro-organisms
B) Freezing micro-organisms
C) Growing micro-organisms under controlled conditions
D) Drying micro-organisms
  • 11. Which of the following is a solid culture medium?
A) Water
B) Agar
C) Oil
D) Broth
  • 12. A Petri dish is used to
A) Grow micro-organisms
B) Kill micro-organisms
C) Store micro-organisms
D) Observe micro-organisms
  • 13. The process of transferring micro-organisms from one medium to another is called
A) Incubation
B) Filtration
C) Inoculation
D) Sterilization
  • 14. The skeleton is made up of
A) Blood and tissues
B) Bones and cartilage
C) Bones only
D) Muscles only
  • 15. The vertebral column protects the
A) Heart
B) Spinal cord
C) Brain
D) Lungs
  • 16. Muscles are attached to bones by
A) Joints
B) Muscles
C) Ligaments
D) Tendons
  • 17. Which type of joint is found in the shoulder?
A) Hinge joint
B) Pivot joint
C) Fixed joint
D) Ball and socket joint
  • 18. The elbow joint is an example of
A) Hinge joint
B) Ball and socket joint
C) Fixed joint
D) Pivot joint
  • 19. The study of crop plants is part of
A) Zoology
B) Genetics
C) Ecology
D) Botany
  • 20. Which of the following is a biological method of pest control?
A) Use of fire
B) Use of machines
C) Use of chemicals
D) Use of natural predators
  • 21. Which of the following is an example of a useful micro-organism in agriculture?
A) Bacteria
B) Virus
C) Fungus
D) Parasite
  • 22. Which of the following practices is based on biological knowledge?
A) Irrigation
B) Use of pesticides
C) Building farmhouses
D) Breeding and pest control
  • 23. The main substance broken down during respiration is
A) Protein
B) Fat
C) Vitamins
D) Glucose
  • 24. The gas taken in during aerobic respiration is
A) Carbon dioxide
B) Hydrogen
C) Oxygen
D) Nitrogen
  • 25. The energy released during respiration is stored in
A) Water
B) ATP
C) RNA
D) DNA
  • 26. The organelle where most respiration occurs is
A) Ribosome
B) Nucleus
C) Mitochondrion
D) Vacuole
  • 27. In humans, anaerobic respiration produces
A) Water
B) Alcohol
C) Carbon dioxide
D) Lactic acid
  • 28. Which of the following releases the most energy?
A) Diffusion
B) Anaerobic respiration
C) Fermentation
D) Aerobic respiration
  • 29. Growth in living organisms is defined as
A) Movement from place to place
B) Reproduction
C) Increase in size and complexity
D) Getting bigger
  • 30. Growth is a result of
A) Respiration
B) Movement
C) Cell division and enlargement
D) Cell death
  • 31. Irritability is the ability of an organism to
A) Move randomly
B) Respond to stimuli
C) Reproduce
D) Grow rapidly
  • 32. A stimulus is
A) A nutrient
B) Any change in the environment
C) A type of cell
D) A tissue
  • 33. Which of the following is an example of irritability?
A) A seed germinating
B) A plant growing taller
C) A baby increasing in weight
D) A person sweating in heat
  • 34. Response in biology refers to
A) Growth of organisms
B) Reaction to a stimulus
C) Feeding
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) Nothing
B) Its survival and function
C) Only its shape
D) Only its size
  • 37. The shrinkage of a plant cell in a hypertonic solution is called
A) Dehydration
B) Diffusion
C) Turgidity
D) Plasmolysis
  • 38. Which method uses high temperature to destroy micro-organisms?
A) Freezing
B) Drying
C) Boiling
D) Filtration
  • 39. A substance used to grow micro-organisms is called
A) Medium
B) Indicator
C) Catalyst
D) Reagent
  • 40. The period during which micro-organisms grow in a controlled environment is called
A) Sterilization
B) Incubation
C) Inoculation
D) Fermentation
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