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