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