https://sindhstudyhub.com/chemistry-jst-important-mcqs-2026/ : Top Biology MCQs for JST 2026 | Important Science Questions for High Marks
BIOLOGY MCQs (51–80) – STS Pattern
51. Chromosomes are made up of:
A) DNA only
B) Proteins only
C) DNA & Proteins
D) RNA
Correct Answer: C) DNA & Proteins
52. Longest bone in human body:
A) Humerus
B) Tibia
C) Femur (Thigh bone)
D) Radius
Correct Answer: C) Femur
53. Universal recipient blood group:
A) AB
B) O
C) A
D) B
Correct Answer: A) AB
54. Universal donor blood group:
A) AB
B) O
C) A
D) B
Correct Answer: B) O
55. Insufficient blood supply in humans is called:
A) Anemia
B) Hemostasis
C) Leukemia
D) Scurvy
Correct Answer: A) Anemia
56. What is added in milk to make curd:
A) Vinegar
B) Salt
C) Bacteria
D) Sugar
Correct Answer: C) Bacteria
57. Converting cooking oil into ghee is called:
A) Oxidation
B) Hydrogenation
C) Saponification
D) Distillation
Correct Answer: B) Hydrogenation
58. Biological clock is regulated by:
A) Thyroid
B) Pineal Gland
C) Pituitary
D) Adrenal glands
Correct Answer: B) Pineal Gland
59. Gland responsible for growth:
A) Thyroid
B) Pituitary
C) Adrenal
D) Pancreas
Correct Answer: B) Pituitary
60. Thyroid gland is also called:
A) Adam’s Apple
B) Larynx
C) Endocrine gland
D) None of the above
Correct Answer: D) None of the above
(Note: Your list had incorrect answer; Thyroid is not Adam’s Apple. Adam’s Apple = Laryngeal prominence)
61. Glands situated over kidneys:
A) Thyroid
B) Adrenal glands
C) Pituitary
D) Sweat glands
Correct Answer: B) Adrenal glands
62. Glands that control blood pressure:
A) Adrenal glands
B) Lachrymal glands
C) Thyroid
D) Pituitary
Correct Answer: A) Adrenal glands
(Corrected; original list had wrong entry)
63. Glands that secrete tears:
A) Lacrimal glands
B) Liver
C) Sebaceous glands
D) Pituitary
Correct Answer: A) Lacrimal glands
64. Largest gland in human body:
A) Liver
B) Larynx
C) Thyroid
D) Pancreas
Correct Answer: A) Liver
65. Thyroid gland is situated:
A) Above Adrenal
B) Below Adam’s Apple
C) Near pancreas
D) In brain
Correct Answer: B) Below Adam’s Apple
66. Emergency hormones are called:
A) Adrenaline
B) Thyroxine
C) Insulin
D) Glucagon
Correct Answer: A) Adrenaline
67. Pancreas secretes:
A) Hormones only
B) Enzymes only
C) Hormones & Enzymes (Insulin & Glucagon)
D) Bile
Correct Answer: C) Hormones & Enzymes
68. If pancreas stops functioning, it may lead to:
A) Diabetes
B) Goitre
C) Anemia
D) Bronchitis
Correct Answer: A) Diabetes
69. pH value of human blood:
A) 6.8
B) 7.0
C) 7.5
D) 8.0
Correct Answer: C) 7.5
70. Blood coagulation means:
A) Blood clotting
B) Blood pressure
C) Oxygen transport
D) Platelet formation
Correct Answer: A) Blood clotting
71. Responsible for blood coagulation:
A) Red blood cells
B) Hemoglobin
C) Fibrinogen
D) Plasma
Correct Answer: C) Fibrinogen
72. Maximum number of ribs are in:
A) Human
B) Snake
C) Dog
D) Cat
Correct Answer: B) Snake
73. Vitamin that helps in blood clotting:
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin K
Correct Answer: D) Vitamin K
74. Deficiency of Vitamin E leads to:
A) Night blindness
B) Infertility
C) Rickets
D) Scurvy
Correct Answer: B) Infertility
75. Influenza is caused by:
A) Bacteria
B) Virus
C) Fungi
D) Protozoa
Correct Answer: B) Virus
76. Sore throat is caused by:
A) Virus
B) Bacteria
C) Fungi
D) Protozoa
Correct Answer: B) Bacteria
77. Viral disease of liver:
A) Hepatitis
B) Jaundice
C) Cholera
D) Tuberculosis
Correct Answer: A) Hepatitis
78. Overproduction of WBC causes:
A) Leukemia (Cancer)
B) Anemia
C) Diabetes
D) Arthritis
Correct Answer: A) Leukemia
79. Cells were first discovered by:
A) Darwin
B) Mendel
C) Hooke (1665)
D) Pasteur
Correct Answer: C) Hooke (1665)
80. Lymphocyte cells are formed in human:
A) Liver
B) Kidney
C) Spleen
D) Heart
Correct Answer: C) Spleen81. Blood, bones, and cartilage are made up of:
A) Muscle Tissue
B) Connective Tissue
C) Epithelial Tissue
D) Nervous Tissue
Correct Answer: B) Connective Tissue
82. Red ants are called:
A) Formica
B) Fire ants
C) Carpenter ants
D) Leafcutter ants
Correct Answer: A) Formica
83. Ants inject on bite:
A) Hydrochloric Acid
B) Formic Acid
C) Acetic Acid
D) Lactic Acid
Correct Answer: B) Formic Acid
84. Cellulose helps in:
A) Digestion of food
B) Movement of bowels
C) Respiration
D) Photosynthesis
Correct Answer: B) Movement of bowels
85. At rest, an adult breathes in & out:
A) 10–12 times/min
B) 15–18 times/min
C) 20–25 times/min
D) 30 times/min
Correct Answer: B) 15–18 times/min
86. What transports oxygen to all body parts:
A) Plasma
B) White Blood Cells
C) Haemoglobin
D) Platelets
Correct Answer: C) Haemoglobin
87. Haemoglobin is present in:
A) White Blood Cells
B) Red Blood Cells
C) Plasma
D) Platelets
Correct Answer: B) Red Blood Cells
88. Pulse rate of resting person:
A) 60–70
B) 72–80
C) 80–90
D) 90–100
Correct Answer: B) 72–80
89. Number of chambers in human heart:
A) 2
B) 3
C) 4
D) 5
Correct Answer: C) 4
90. Upper two chambers of human heart:
A) Ventricle
B) Atria
C) Auricle
D) Septum
Correct Answer: B) Atria
91. Lower two chambers of human heart:
A) Atria
B) Ventricle
C) Auricle
D) Septum
Correct Answer: B) Ventricle
92. Urine goes from kidney to:
A) Urethra
B) Ureter
C) Bladder
D) Liver
Correct Answer: B) Ureter
93. An adult passes urine:
A) 0.5–1 L in 24 hrs
B) 1–1.8 L in 24 hrs
C) 2–2.5 L in 24 hrs
D) 3 L in 24 hrs
Correct Answer: B) 1–1.8 L in 24 hrs
94. Blood is filtered through artificial kidney by:
A) Dialysis
B) Osmosis
C) Filtration
D) Diffusion
Correct Answer: A) Dialysis
95. What cools the plant:
A) Transpiration
B) Photosynthesis
C) Respiration
D) Evaporation
Correct Answer: A) Transpiration
96. Pancreas not producing insulin causes:
A) Goitre
B) Diabetes
C) Anemia
D) Tuberculosis
Correct Answer: B) Diabetes
97. Thyroid gland not producing thyroid hormone causes:
A) Diabetes
B) Goitre (Neck swelling)
C) Anemia
D) Hypertension
Correct Answer: B) Goitre
98. Gland under the layer of skin:
A) Sebaceous Gland
B) Sweat Gland
C) Adrenal Gland
D) Pituitary Gland
Correct Answer: A) Sebaceous Gland
99. Increased activity of Sebaceous glands causes:
A) Acne and Pimples
B) Hair loss
C) Sweating
D) Dry skin
Correct Answer: A) Acne and Pimples