Tuesday, April 1, 2025
Biology quiz multiple choice questions (MCQS) With answers
Sunday, March 30, 2025
Biology Pkmcqs solved with answer
Biology PKMCQs solved with answers. Covering key topics for NTS, FPSC, PPSC, and ETEA, these solved MCQs help you strengthen your biology knowledge.
Biology Pkmcqs solved with answer:
51. The part of the eye that controls the amount of light entering is:
a) Retina
b) Cornea
c) Pupil ✅
d) Lens
52. Which part of the human ear is responsible for balance?
a) Cochlea
b) Eustachian tube
c) Semicircular canals ✅
d) Tympanic membrane
53. The fluid that lubricates joints is called:
a) Plasma
b) Cerebrospinal fluid
c) Synovial fluid ✅
d) Bile
54. The process of breaking down food into simpler molecules is called:
a) Digestion ✅
b) Respiration
c) Excretion
d) Photosynthesis
55. The largest organ inside the human body is:
a) Heart
b) Brain
c) Liver ✅
d) Stomach
56. Which type of RNA carries amino acids to the ribosome?
a) mRNA
b) tRNA ✅
c) rRNA
d) hnRNA
57. The blood vessel that carries oxygenated blood from the lungs to the heart is:
a) Pulmonary vein ✅
b) Pulmonary artery
c) Aorta
d) Vena cava
58. The organ responsible for filtering waste from the blood is:
a) Liver
b) Kidney ✅
c) Pancreas
d) Spleen
59. The process by which a cell engulfs solid particles is called:
a) Diffusion
b) Osmosis
c) Phagocytosis ✅
d) Pinocytosis
60. The genetic material found in viruses is:
a) DNA
b) RNA
c) Either DNA or RNA ✅
d) Both DNA and RNA
61. The main function of the lymphatic system is:
a) Oxygen transport
b) Digestion
c) Immunity ✅
d) Hormone regulation
62. Which of the following is a type of connective tissue?
a) Muscle
b) Bone ✅
c) Skin
d) Epithelium
63. The process of cell division that produces gametes is called:
a) Mitosis
b) Binary fission
c) Meiosis ✅
d) Budding
64. The main function of hemoglobin is to:
a) Digest food
b) Transport oxygen ✅
c) Clot blood
d) Produce energy
65. Which organ system includes the brain and spinal cord?
a) Circulatory system
b) Nervous system ✅
c) Digestive system
d) Respiratory system
66. The tube that connects the kidney to the bladder is:
a) Urethra
b) Ureter ✅
c) Esophagus
d) Fallopian tube
67. Which vitamin is essential for blood clotting?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin K ✅
68. The deficiency of iodine causes:
a) Rickets
b) Scurvy
c) Goiter ✅
d) Anemia
69. The muscle that separates the chest from the abdomen is:
a) Pectoral muscle
b) Diaphragm ✅
c) Abdominal muscle
d) Intercostal muscle
70. The major site of protein synthesis in a cell is:
a) Nucleus
b) Mitochondria
c) Ribosomes ✅
d) Lysosomes
71. The function of the large intestine is:
a) Nutrient absorption
b) Water absorption ✅
c) Protein digestion
d) Enzyme production
72. The bones of the spine are called:
a) Ribs
b) Vertebrae ✅
c) Femurs
d) Clavicles
73. The enzyme in saliva that digests starch is:
a) Amylase ✅
b) Lipase
c) Pepsin
d) Trypsin
74. The part of the brain that controls voluntary movements is:
a) Cerebellum
b) Medulla oblongata
c) Cerebrum ✅
d) Pons
75. Which type of joint is found in the knee?
a) Ball and socket
b) Hinge ✅
c) Pivot
d) Gliding
76. The storage form of glucose in the human body is:
a) Starch
b) Glycogen ✅
c) Cellulose
d) Lipid
77. The organ that produces insulin is:
a) Liver
b) Kidney
c) Pancreas ✅
d) Spleen
78. The longest muscle in the human body is:
a) Biceps
b) Sartorius ✅
c) Triceps
d) Deltoid
79. The tube that carries sperm from the testes is:
a) Ureter
b) Vas deferens ✅
c) Urethra
d) Fallopian tube
80. The main function of chloroplasts is:
a) Respiration
b) Photosynthesis ✅
c) Protein synthesis
d) Digestion
81. The part of the brain that controls heart rate and breathing is:
a) Cerebrum
b) Cerebellum
c) Medulla oblongata ✅
d) Pons
82. The process by which plants convert nitrogen gas into usable forms is called:
a) Photosynthesis
b) Nitrogen fixation ✅
c) Transpiration
d) Respiration
83. Which macromolecule is the main component of cell membranes?
a) Proteins
b) Carbohydrates
c) Phospholipids ✅
d) Nucleic acids
84. The part of the plant responsible for water absorption is:
a) Stem
b) Root ✅
c) Leaf
d) Flower
85. What is the function of hemoglobin?
a) Digestion
b) Oxygen transport ✅
c) Blood clotting
d) Hormone production
86. The enzyme that breaks down proteins is:
a) Amylase
b) Lipase
c) Pepsin ✅
d) Maltase
87. The fluid that cushions and protects the brain is:
a) Synovial fluid
b) Lymph
c) Cerebrospinal fluid ✅
d) Plasma
88. The storage form of energy in animals is:
a) Starch
b) Glycogen ✅
c) Cellulose
d) Glucose
89. What is the main function of white blood cells?
a) Transport oxygen
b) Fight infections ✅
c) Carry nutrients
d) Store energy
90. The process by which green plants make their own food is called:
a) Respiration
b) Transpiration
c) Photosynthesis ✅
d) Fermentation
91. The largest part of the human brain is:
a) Cerebellum
b) Cerebrum ✅
c) Medulla oblongata
d) Pons
92. The fluid that lubricates joints is:
a) Plasma
b) Bile
c) Synovial fluid ✅
d) Cerebrospinal fluid
93. Which vitamin is essential for vision?
a) Vitamin A ✅
b) Vitamin B
c) Vitamin C
d) Vitamin D
94. The process of excreting sweat from sweat glands is called:
a) Transpiration
b) Perspiration ✅
c) Respiration
d) Secretion
95. The major function of the large intestine is:
a) Nutrient absorption
b) Water absorption ✅
c) Digestion of proteins
d) Secretion of bile
96. The protein that makes up hair and nails is:
a) Collagen
b) Keratin ✅
c) Hemoglobin
d) Elastin
97. The organ that produces bile is:
a) Liver ✅
b) Pancreas
c) Gallbladder
d) Small intestine
98. Which structure in the lungs is responsible for gas exchange?
a) Trachea
b) Bronchi
c) Alveoli ✅
d) Diaphragm
99. The smallest living unit in an organism is:
a) Atom
b) Molecule
c) Cell ✅
d) Tissue
100. The part of the flower that produces pollen is:
a) Ovary
b) Stigma
c) Anther ✅
d) Petal
Biology Pkmcqs with answer
Biology PKMCQs with answers covering key topics for NTS, FPSC, PPSC, and ETEA, these solved MCQs will help you strengthen your biology concepts. Start practicing today!
Biology Pkmcqs with answer:
1. The basic unit of life is:
a) Atom
b) Molecule
c) Cell ✅
d) Tissue
2. Which organelle is known as the powerhouse of the cell?
a) Nucleus
b) Chloroplast
c) Mitochondria ✅
d) Ribosome
3. DNA stands for:
a) Deoxyribonucleic acid ✅
b) Dextrose nitrogen acid
c) Deoxyribose amino acid
d) Double nitrogen acid
4. The process of converting light energy into chemical energy in plants is called:
a) Respiration
b) Transpiration
c) Photosynthesis ✅
d) Fermentation
5. The largest organ in the human body is:
a) Heart
b) Brain
c) Liver
d) Skin ✅
6. The pigment responsible for photosynthesis is:
a) Hemoglobin
b) Melanin
c) Chlorophyll ✅
d) Carotene
7. The study of heredity and genes is called:
a) Anatomy
b) Genetics ✅
c) Ecology
d) Botany
8. Which vitamin is produced in the skin when exposed to sunlight?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D ✅
9. The longest bone in the human body is:
a) Humerus
b) Radius
c) Tibia
d) Femur ✅
10. Which part of the cell contains genetic material?
a) Mitochondria
b) Ribosome
c) Nucleus ✅
d) Golgi body
11. The fluid part of blood is called:
a) Plasma ✅
b) Platelets
c) White blood cells
d) Red blood cells
12. The smallest unit of inheritance is:
a) Gene ✅
b) Chromosome
c) DNA
d) RNA
13. Which organ filters blood and produces urine?
a) Liver
b) Kidney ✅
c) Heart
d) Pancreas
14. The function of ribosomes is:
a) Energy production
b) Protein synthesis ✅
c) Digestion
d) Cell division
15. The process by which cells divide to produce identical daughter cells is called:
a) Meiosis
b) Mitosis ✅
c) Binary fission
d) Budding
16. The functional unit of the kidney is:
a) Nephron ✅
b) Glomerulus
c) Ureter
d) Alveoli
17. Which enzyme digests starch?
a) Lipase
b) Amylase ✅
c) Pepsin
d) Trypsin
18. The primary function of red blood cells is:
a) Fight infection
b) Carry oxygen ✅
c) Transport nutrients
d) Form blood clots
19. Which gas is released during respiration?
a) Oxygen
b) Carbon dioxide ✅
c) Nitrogen
d) Hydrogen
20. The hormone that regulates blood sugar levels is:
a) Insulin ✅
b) Adrenaline
c) Estrogen
d) Thyroxine
21. The largest part of the human brain is:
a) Cerebrum ✅
b) Cerebellum
c) Medulla
d) Pons
22. The waste product of photosynthesis is:
a) Carbon dioxide
b) Oxygen ✅
c) Nitrogen
d) Water
23. The smallest bone in the human body is:
a) Femur
b) Tibia
c) Stapes ✅
d) Humerus
24. The fluid that cushions the brain is:
a) Plasma
b) Synovial fluid
c) Cerebrospinal fluid ✅
d) Lymph
25. The part of the brain that controls emotions is:
a) Cerebrum ✅
b) Cerebellum
c) Medulla
d) Hypothalamus
26. The structure in the lungs responsible for gas exchange is:
a) Trachea
b) Bronchi
c) Alveoli ✅
d) Diaphragm
27. The process by which green plants make their own food is called:
a) Transpiration
b) Respiration
c) Photosynthesis ✅
d) Osmosis
28. Which blood type is a universal donor?
a) A
b) B
c) AB
d) O-negative ✅
29. The largest artery in the body is:
a) Pulmonary artery
b) Carotid artery
c) Aorta ✅
d) Coronary artery
30. The tube that carries food from the mouth to the stomach is:
a) Trachea
b) Urethra
c) Esophagus ✅
d) Duodenum
31. Which organ produces bile?
a) Liver ✅
b) Pancreas
c) Gallbladder
d) Stomach
32. Which blood cells fight infections?
a) Red blood cells
b) White blood cells ✅
c) Platelets
d) Plasma
33. The structural and functional unit of the nervous system is:
a) Neuron ✅
b) Axon
c) Myelin
d) Synapse
34. The pigment responsible for skin color is:
a) Hemoglobin
b) Melanin ✅
c) Chlorophyll
d) Carotene
35. The enzyme that breaks down fats is:
a) Amylase
b) Lipase ✅
c) Pepsin
d) Trypsin
36. The functional unit of the nervous system is:
a) Neuron ✅
b) Axon
c) Myelin
d) Synapse
37. The part of the brain that regulates body temperature is:
a) Hypothalamus ✅
b) Cerebellum
c) Medulla
d) Cerebrum
38. The protein that makes up hair and nails is:
a) Collagen
b) Hemoglobin
c) Keratin ✅
d) Elastin
39. The muscle that helps in breathing is:
a) Intercostal muscle
b) Abdominal muscle
c) Diaphragm ✅
d) Deltoid
40. The part of the flower that produces pollen is:
a) Ovary
b) Stigma
c) Anther ✅
d) Petal
41. The smallest unit of a chemical element is:
a) Molecule
b) Atom ✅
c) Cell
d) Proton
42. The part of the human brain responsible for coordination and balance is:
a) Cerebrum
b) Medulla
c) Cerebellum ✅
d) Hypothalamus
43. The outermost layer of the skin is called:
a) Dermis
b) Epidermis ✅
c) Hypodermis
d) Endoderm
44. The main function of platelets is:
a) Oxygen transport
b) Blood clotting ✅
c) Digestion
d) Immunity
45. Which hormone is responsible for the fight-or-flight response?
a) Insulin
b) Adrenaline ✅
c) Thyroxine
d) Estrogen
46. The enzyme that converts lactose into glucose and galactose is:
a) Amylase
b) Lactase ✅
c) Pepsin
d) Lipase
47. The powerhouse of the plant cell is:
a) Nucleus
b) Chloroplast
c) Mitochondria ✅
d) Ribosome
48. The deficiency of vitamin C causes:
a) Rickets
b) Scurvy ✅
c) Night blindness
d) Beriberi
49. The part of the digestive system responsible for nutrient absorption is:
a) Stomach
b) Large intestine
c) Small intestine ✅
d) Esophagus
50. The process by which plants lose water through stomata is called:
a) Photosynthesis
b) Transpiration ✅
c) Respiration
d) Excretion