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