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) Cytoplasm
B) Ribosome
C) Nucleus
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) Nucleus
B) Cell wall
C) Cytoplasm
D) Mitochondria
  • 5. When a plant cell is placed in a hypotonic solution, it becomes
A) Plasmolysed
B) Turgid
C) Dead
D) Flaccid
  • 6. When a red blood cell is placed in distilled water, it will
A) Burst
B) Shrink
C) Remain the same
D) Harden
  • 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) Fermentation
C) Pasteurization
D) Sterilization
  • 9. Vaccination helps to
A) Destroy viruses directly
B) Prevent diseases by building immunity
C) Kill all micro-organisms
D) Cure diseases instantly
  • 10. Culturing in biology means
A) Killing micro-organisms
B) Drying micro-organisms
C) Freezing micro-organisms
D) Growing micro-organisms under controlled conditions
  • 11. Which of the following is a solid culture medium?
A) Broth
B) Water
C) Agar
D) Oil
  • 12. A Petri dish is used to
A) Grow micro-organisms
B) Store micro-organisms
C) Observe micro-organisms
D) Kill micro-organisms
  • 13. The process of transferring micro-organisms from one medium to another is called
A) Incubation
B) Sterilization
C) Filtration
D) Inoculation
  • 14. The skeleton is made up of
A) Blood and tissues
B) Muscles only
C) Bones and cartilage
D) Bones only
  • 15. The vertebral column protects the
A) Heart
B) Brain
C) Lungs
D) Spinal cord
  • 16. Muscles are attached to bones by
A) Muscles
B) Tendons
C) Ligaments
D) Joints
  • 17. Which type of joint is found in the shoulder?
A) Ball and socket joint
B) Pivot joint
C) Fixed joint
D) Hinge joint
  • 18. The elbow joint is an example of
A) Ball and socket joint
B) Pivot joint
C) Fixed joint
D) Hinge joint
  • 19. The study of crop plants is part of
A) Zoology
B) Ecology
C) Genetics
D) Botany
  • 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) Virus
B) Bacteria
C) Fungus
D) Parasite
  • 22. Which of the following practices is based on biological knowledge?
A) Breeding and pest control
B) Building farmhouses
C) Irrigation
D) Use of pesticides
  • 23. The main substance broken down during respiration is
A) Vitamins
B) Protein
C) Fat
D) Glucose
  • 24. The gas taken in during aerobic respiration is
A) Nitrogen
B) Hydrogen
C) Oxygen
D) Carbon dioxide
  • 25. The energy released during respiration is stored in
A) Water
B) DNA
C) RNA
D) ATP
  • 26. The organelle where most respiration occurs is
A) Nucleus
B) Mitochondrion
C) Ribosome
D) Vacuole
  • 27. In humans, anaerobic respiration produces
A) Carbon dioxide
B) Lactic acid
C) Alcohol
D) Water
  • 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) Reproduction
B) Increase in size and complexity
C) Getting bigger
D) Movement from place to place
  • 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) Move randomly
B) Reproduce
C) Respond to stimuli
D) Grow rapidly
  • 32. A stimulus is
A) A type of cell
B) A tissue
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 baby increasing in weight
C) A seed germinating
D) A person sweating in heat
  • 34. Response in biology refers to
A) Reproduction
B) Growth of organisms
C) Reaction to a stimulus
D) Feeding
  • 35. In which solution will there be no net movement of water?
A) Isotonic
B) Hypotonic
C) Concentrated
D) Hypertonic
  • 36. The environment surrounding a cell affects
A) Only its shape
B) Its survival and function
C) Nothing
D) Only its size
  • 37. The shrinkage of a plant cell in a hypertonic solution is called
A) Turgidity
B) Dehydration
C) Plasmolysis
D) Diffusion
  • 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) Medium
B) Indicator
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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