PES SS1 Biology (Obj) 2nd Term Exam 2025/2026
  • 1. Which part of the cell controls its activities?
A) Nucleus
B) Mitochondria
C) Cell membrane
D) Cytoplasm
  • 2. The jelly-like substance inside the cell is called
A) Nucleus
B) Ribosome
C) Cytoplasm
D) Vacuole
  • 3. The cell membrane is responsible for
A) Producing energy
B) Controlling what enters and leaves the cell
C) Storing food
D) Making proteins
  • 4. Which structure is only found in plant cells?
A) Nucleus
B) Cytoplasm
C) Cell wall
D) Mitochondria
  • 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) Burst
B) Shrink
C) Harden
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) Distillation
B) Pasteurization
C) Fermentation
D) Sterilization
  • 9. Vaccination helps to
A) Kill all micro-organisms
B) Prevent diseases by building immunity
C) Cure diseases instantly
D) Destroy viruses directly
  • 10. Culturing in biology means
A) Killing micro-organisms
B) Growing micro-organisms under controlled conditions
C) Freezing micro-organisms
D) Drying micro-organisms
  • 11. Which of the following is a solid culture medium?
A) Agar
B) Broth
C) Water
D) Oil
  • 12. A Petri dish is used to
A) Observe micro-organisms
B) Grow micro-organisms
C) Store micro-organisms
D) Kill micro-organisms
  • 13. The process of transferring micro-organisms from one medium to another is called
A) Inoculation
B) Sterilization
C) Filtration
D) Incubation
  • 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) Lungs
B) Brain
C) Heart
D) Spinal cord
  • 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) Fixed joint
B) Ball and socket joint
C) Hinge joint
D) Pivot joint
  • 18. The elbow joint is an example of
A) Pivot joint
B) Fixed joint
C) Hinge joint
D) Ball and socket joint
  • 19. The study of crop plants is part of
A) Zoology
B) Botany
C) Ecology
D) Genetics
  • 20. Which of the following is a biological method of pest control?
A) Use of chemicals
B) Use of fire
C) Use of machines
D) Use of natural predators
  • 21. Which of the following is an example of a useful micro-organism in agriculture?
A) Bacteria
B) Fungus
C) Virus
D) Parasite
  • 22. Which of the following practices is based on biological knowledge?
A) Building farmhouses
B) Breeding and pest control
C) Use of pesticides
D) Irrigation
  • 23. The main substance broken down during respiration is
A) Glucose
B) Vitamins
C) Fat
D) Protein
  • 24. The gas taken in during aerobic respiration is
A) Hydrogen
B) Nitrogen
C) Oxygen
D) Carbon dioxide
  • 25. The energy released during respiration is stored in
A) Water
B) ATP
C) DNA
D) RNA
  • 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) Lactic acid
C) Alcohol
D) Carbon dioxide
  • 28. Which of the following releases the most energy?
A) Aerobic respiration
B) Diffusion
C) Fermentation
D) Anaerobic respiration
  • 29. Growth in living organisms is defined as
A) Movement from place to place
B) Increase in size and complexity
C) Reproduction
D) Getting bigger
  • 30. Growth is a result of
A) Cell division and enlargement
B) Cell death
C) Movement
D) Respiration
  • 31. Irritability is the ability of an organism to
A) Grow rapidly
B) Move randomly
C) Reproduce
D) Respond to stimuli
  • 32. A stimulus is
A) A nutrient
B) Any change in the environment
C) A tissue
D) A type of cell
  • 33. Which of the following is an example of irritability?
A) A baby increasing in weight
B) A plant growing taller
C) A seed germinating
D) A person sweating in heat
  • 34. Response in biology refers to
A) Growth of organisms
B) Reaction to a stimulus
C) Reproduction
D) Feeding
  • 35. In which solution will there be no net movement of water?
A) Isotonic
B) Hypertonic
C) Concentrated
D) Hypotonic
  • 36. The environment surrounding a cell affects
A) Only its shape
B) Nothing
C) Its survival and function
D) Only its size
  • 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) Freezing
C) Boiling
D) Drying
  • 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) Inoculation
B) Incubation
C) Sterilization
D) Fermentation
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