Form 3 Biology Questions and Answers

form 3 biology questions and answers

Form 3 Biology Questions and Answers

These questions are tested in Kenya secondary schools. You can use them to prepare for your next exam and also have fun while doing it.

1. How does the process of fertilization occur in humans?

Answer: In humans, fertilization occurs when a sperm cell meets and penetrates an egg cell in the fallopian tube, resulting in the fusion of their genetic material and the formation of a zygote. The zygote then travels down the fallopian tube and implants itself in the uterus, where it develops into a fetus.

2. What is the scientific name for the air sacs in the lungs?

Answer: Alveoli

3. What is the function of the spleen in the human body?

Answer: The spleen filters the blood, stores red blood cells, and helps to fight infections.

4. What is the process of cellular respiration?

Answer: Cellular respiration is the process by which cells convert glucose into energy in the form of ATP.

5. What are the three main types of muscle tissue?

Answer: Skeletal, smooth, and cardiac muscle.

6. What is the role of hormones in the endocrine system?

Answer: Hormones regulate various bodily functions and help to maintain homeostasis.

7. What is the process of osmosis?

Answer: Osmosis is the diffusion of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.

8. What is the function of the kidneys in the human body?

Answer: The kidneys filter waste products from the blood, regulate electrolyte levels, and help to regulate blood pressure.

9. What are the components of DNA?

Answer: DNA is composed of four nitrogenous bases (adenine, guanine, cytosine, and thymine), a sugar molecule, and a phosphate group.

10. What is the process of natural selection?

Answer: Natural selection is the process by which certain traits that are advantageous for survival and reproduction become more common in a population over time, while traits that are less advantageous become less common.

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11. What is the function of ribosomes in cells?

Answer: Ribosomes are the site of protein synthesis in cells.

12. What is the function of the larynx in the human body?

Answer: The larynx, also known as the voice box, is responsible for producing sound through the vibration of the vocal cords.

13. What is the process of mitosis?

Answer: Mitosis is the process of cell division in which a single cell divides into two identical daughter cells.

14. What is the role of the hypothalamus in the endocrine system?

Answer: The hypothalamus controls the release of hormones from the pituitary gland.

15. What is the function of the liver in the human body?

Answer: The liver is responsible for producing bile, which helps to digest fats, filtering toxins from the blood, and regulating metabolism.

16. What is the process of fermentation?

Answer: Fermentation is the process of converting sugars into energy without the use of oxygen.

17. What is the function of the cilia in the respiratory system?

Answer: Cilia are tiny hair-like structures that help to move mucus and debris out of the respiratory system.

18. What is the process of transpiration in plants?

Answer: Transpiration is the process of water movement through a plant and its evaporation from aerial parts, especially from the leaves but also from stems and flowers.

19. What is the function of the medulla oblongata in the human body?

Answer: The medulla oblongata is responsible for controlling unconscious functions such as heart rate, breathing, and digestion.

20. What is the process of digestion in the human body?

A: Digestion is the process by which food is broken down into smaller molecules that can be absorbed and used by the body for energy and growth.

21. What are the main components of the blood?

Answer: The main components of blood are red blood cells, white blood cells, platelets, and plasma.

22. What is the process of photosynthesis in plants?

Answer: Photosynthesis is the process by which plants convert light energy into chemical energy in the form of glucose.

23. What is the function of the diaphragm in the human body?

Answer: The diaphragm is responsible for controlling breathing by contracting and relaxing to change the volume of the thorax.

24. What is the role of the pituitary gland in the endocrine system?

Answer: The pituitary gland is responsible for regulating the release of hormones from other endocrine glands.

25. What is the function of the adrenal glands in the human body?

Answer: The adrenal glands are responsible for producing hormones that help to regulate stress responses and maintain homeostasis.

26. What is the process of nitrogen fixation?

Answer: Nitrogen fixation is the process by which atmospheric nitrogen is converted into a form that can be used by plants and animals, such as nitrates or ammonium.

27. What is the function of the trachea in the human body?

Answer: The trachea, also known as the windpipe, is responsible for carrying air to and from the lungs.

28. What is the process of DNA replication?

Answer: DNA replication is the process by which a cell makes a copy of its DNA before cell division.

29. What is the role of the thyroid gland in the endocrine system?

Answer: The thyroid gland is responsible for producing hormones that regulate metabolism and energy levels.

30. What is the function of the pancreas in the human body?

Answer: The pancreas is responsible for producing insulin, which helps to regulate blood sugar levels, and digestive enzymes.

31. What is the process of cellular division in prokaryotes?

Answer: Cellular division in prokaryotes is a process known as binary fission, in which the cell divides into two daughter cells.

32. What is the function of the pharynx in the human body?

Answer: The pharynx, also known as the throat, is responsible for moving food and air to the appropriate places in the body.

33. What is the process of water transport in plants?

Answer: Water transport in plants is the movement of water from the roots to the leaves and other parts of the plant.

34. What is the role of the parathyroid glands in the endocrine system?

Answer: The parathyroid glands are responsible for regulating the levels of calcium in the blood.

35. What is the function of the esophagus in the human body?

Answer: The esophagus is responsible for moving food from the mouth to the stomach.

36. What is the process of respiration in plants?

Answer: Respiration in plants is the process by which glucose is broken down to release energy.

37. What is the function of the testes in the human body?

Answer: The testes are responsible for producing sperm and the hormone testosterone.

38. What is the process of chemical digestion in the human body?

Answer: Chemical digestion is the process by which food is broken down into smaller molecules by digestive enzymes.

39. What is the role of the ovaries in the human body?

Answer: The ovaries are responsible for producing eggs and the hormone estrogen.

40. What is the process of diffusion in cells?

Answer: Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

41. What is the function of the prostate gland in the human body?

Answer: The prostate gland is responsible for producing fluid that helps to nourish and transport sperm.

42. What is the process of reproduction in flowering plants?

Answer: Reproduction in flowering plants is the process by which seeds are produced through the development of flowers.

43. What is the function of the aorta in the human body?

Answer: The aorta is the main blood vessel that carries oxygenated blood from the heart to the rest of the body.

44. What is the process of carbon cycle in the biosphere?

Answer: The carbon cycle is the process by which carbon is exchanged between living organisms, the atmosphere, oceans, and the Earth’s crust.

45. What is the function of the urinary bladder in the human body?

Answer: The urinary bladder is responsible for storing urine produced by the kidneys until it is eliminated from the body.

46. What is the process of photosynthesis in plants?

Answer: Photosynthesis is the process by which plants use energy from light to convert carbon dioxide and water into glucose and oxygen.

47. What is the function of the adrenal glands in the endocrine system?

Answer: The adrenal glands are responsible for producing hormones that regulate the body’s response to stress.

48. What is the process of osmoregulation in organisms?

Answer: Osmoregulation is the process by which organisms maintain a balance of water and dissolved substances in their cells.

49. What is the function of the pineal gland in the endocrine system?

Answer: The pineal gland is responsible for producing the hormone melatonin, which helps regulate sleep and wake cycles.

50. What is the process of transcription in the formation of proteins?

Answer: Transcription is the process by which genetic information in DNA is copied into RNA, which is then used to synthesize proteins.

51. What is the process of passive transport in cells?

Answer: Passive transport is the movement of substances across the cell membrane without the use of energy.

52. What is the function of the muscular system in movement?

Answer: The muscular system is responsible for the contraction and relaxation of muscles, which allows for movement.

53. What is the process of active transport in cells?

Answer: Active transport is the movement of substances across the cell membrane using energy.

54. What is the role of the nervous system in movement?

Answer: The nervous system is responsible for sending and receiving signals that control muscle contractions, allowing for movement.

55. What is the process of diffusion in cells?

Answer: Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

56. What is the role of bones in movement?

Answer: Bones provide a framework for the body and serve as points of attachment for muscles, allowing for movement.

57. What is the process of facilitated diffusion in cells?

Answer: Facilitated diffusion is a form of passive transport in which substances move across the cell membrane with the help of carrier proteins.

58. What is the role of joints in movement?

Answer: Joints allow bones to move in relation to one another, allowing for movement of the body.

59. What is the process of osmosis in cells?

Answer: Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.

60. What is the role of tendons in movement?

Answer: Tendons connect muscles to bones, allowing for the transfer of force from the muscle to the bone and facilitating movement.

61. What is the process of exocytosis in cells?

Answer: Exocytosis is the process by which substances are expelled from the cell by fusion of the cell membrane with vesicles containing the substances.

62. What is the role of ligaments in movement?

Answer: Ligaments connect bones to other bones, providing stability and allowing for limited movement.

63. What is the process of endocytosis in cells?

Answer: Endocytosis is the process by which substances are taken into the cell by invagination of the cell membrane.

64. What is the role of muscle tone in movement?

Answer: Muscle tone refers to the slight contraction of muscles at rest, which helps maintain posture and allows for quick movement.

65. What is the process of peristalsis in the digestive system?

Answer: Peristalsis is the wave-like contraction of muscles in the wall of the digestive tract, which moves food through the digestive system.

66. What is the role of reflexes in movement?

Answer: Reflexes are rapid, automatic movements in response to a stimulus, allowing for quick movements without conscious thought.

67. What is the process of kinesis in organisms?

Answer: Kinesis is the movement of an organism in response to a stimulus, such as light or touch.

68. What is the role of proprioception in movement?

A: Proprioception is the sense of body position and movement, which allows for conscious control of movements.

69. What is the process of chemoreception in organisms?

Answer: Chemoreception is the detection of chemical stimuli, such as odors or tastes, which can stimulate movement.

70. What is the role of gravity in movement?

Answer: Gravity is the force that pulls objects towards the center

71. What is the function of the kidneys in excretion?

Answer: The kidneys are responsible for filtering waste products from the blood and eliminating them from the body in the form of urine.

72. What is the process of urine formation in the kidneys?

Answer: Urine is formed in the kidneys through a series of processes including filtration, reabsorption, and secretion.

73. What is the role of the ureters in excretion?

Answer: The ureters are tubes that transport urine from the kidneys to the bladder.

74. What is the function of the bladder in excretion?

Answer: The bladder is a muscular sac that stores urine until it is eliminated from the body.

75. What is the role of the urethra in excretion?

Answer: The urethra is a tube that carries urine from the bladder to the outside of the body.

76. What is the process of osmoregulation in excretion?

Answer: Osmoregulation is the process by which the body regulates the balance of water and dissolved substances, which is important for proper excretion.

77. What is the role of the renal corpuscles in urine formation?

Answer: The renal corpuscles are the structures in the kidney that filter waste products from the blood.

78. What is the process of dialysis in the treatment of kidney failure?

Answer: Dialysis is a process that removes waste products from the blood of a person with kidney failure.

79. What is the role of the renal tubules in urine formation?

Answer: The renal tubules are the structures in the kidney that reabsorb substances and secrete waste products into the urine.

80. What is the function of the adrenal glands in excretion?

Answer: The adrenal glands produce hormones that regulate the body’s response to stress, which can affect excretion.

81. What is the role of the Nephron in urine formation?

Answer: The nephron is the functional unit of the kidney, responsible for filtering waste products from the blood and forming urine.

82. What is the process of glomerular filtration in the kidney?

Answer: Glomerular filtration is the first step in urine formation, in which waste products are filtered from the blood in the renal corpuscles.

83. What is the role of the loop of Henle in urine formation?

Answer: The loop of Henle is a portion of the renal tubules that plays a key role in regulating the concentration of waste products in the urine.

84. What is the process of reabsorption in the kidney?

Answer: Reabsorption is the process by which useful substances are taken back into the bloodstream from the urine in the renal tubules.

85. What is the role of the collecting ducts in urine formation?

Answer: The collecting ducts are the final portion of the renal tubules that transport urine to the calyces, from which it is passed to the bladder.

86. What is the process of secretion in the kidney?

Answer: Secretion is the process by which waste products are added to the urine in the renal tubules.

87. What is the role of the distal tubules and collecting ducts in regulation of electrolyte balance in the body?

Answer: The distal tubules and collecting ducts play a crucial role in regulating electrolyte balance by reabsorbing or secreting ions as necessary.

88. What is the process of diuresis in the kidney?

Answer: Diuresis is the increase in urine

89. How does sexual reproduction occur in flowering plants?

Answer: In flowering plants, sexual reproduction occurs through the process of pollination, in which pollen from the male reproductive structure (stamen) fertilizes the female reproductive structure (pistil) resulting in the formation of seeds.

90. What is the function of the ovaries in female reproduction?

Answer: The ovaries in female reproduction produce and release eggs (ova) into the fallopian tubes, where fertilization by sperm can occur.