One liner Question – Answers on Biology GK
Here is a set of 100 one-liner MCQs on Biology for Class 8–10, focusing on a difficult and conceptual level:
1. What is the powerhouse of the cell?
a) Mitochondria
2. Which enzyme is present in saliva to digest starch?
a) Amylase
3. What is the functional unit of the kidney?
a) Nephron
4. Which pigment is responsible for photosynthesis in plants?
a) Chlorophyll
5. Which molecule stores genetic information in living organisms?
a) DNA
6. What is the movement of water molecules across a semi-permeable membrane called?
a) Osmosis
7. What is the site of protein synthesis in a cell?
a) Ribosome
8. Which disease is caused by the deficiency of iodine?
a) Goiter
9. What type of blood vessel carries blood away from the heart?
a) Artery
10. Which organelle is known as the “suicidal bag” of the cell?
a) Lysosome
11. Which vitamin is synthesized in the skin upon sunlight exposure?
a) Vitamin D
12. What is the largest gland in the human body?
a) Liver
13. Which organism is used in the production of antibiotics?
a) Fungus
14. What is the process by which green plants prepare their food?
a) Photosynthesis
15. Which element is central to the chlorophyll molecule?
a) Magnesium
16. What is the name of the protein that carries oxygen in the blood?
a) Hemoglobin
17. Which blood component helps in clotting?
a) Platelets
18. Which process converts glucose into energy in cells?
a) Cellular respiration
19. What is the main nitrogenous waste in humans?
a) Urea
20. What is the organ of hearing in humans?
a) Cochlea
21. What connects bones to muscles?
a) Tendons
22. Which hormone regulates blood sugar levels?
a) Insulin
23. Which part of the brain regulates heartbeat and breathing?
a) Medulla
24. What are the smallest blood vessels called?
a) Capillaries
25. What are chromosomes made of?
a) DNA and protein
26. Which type of cell lacks a nucleus?
a) Red blood cell
27. Which disease is caused by the bite of a female Anopheles mosquito?
a) Malaria
28. What is the process of removal of waste products from the body?
a) Excretion
29. Which organ produces bile?
a) Liver
30. Which is the smallest bone in the human body?
a) Stapes
31. Which gas is required for aerobic respiration?
a) Oxygen
32. Which part of the plant is involved in transpiration?
a) Stomata
33. Which hormone is secreted by the adrenal glands during stress?
a) Adrenaline
34. Which structure connects the mother and fetus for nutrient exchange?
a) Placenta
35. What is the genetic condition caused by an extra chromosome 21?
a) Down syndrome
36. What is the chemical name of vitamin C?
a) Ascorbic acid
37. Which organ in humans filters blood to form urine?
a) Kidney
38. What is the normal pH of human blood?
a) 7.4
39. Which microorganism causes tuberculosis?
a) Mycobacterium
40. Which cells are responsible for immunity in the body?
a) White blood cells
41. Which hormone regulates the sleep-wake cycle?
a) Melatonin
42. What is the outermost layer of skin called?
a) Epidermis
43. Which part of the flower produces pollen?
a) Anther
44. Which gas is released during the process of photosynthesis?
a) Oxygen
45. Which structure controls the entry and exit of substances in a cell?
a) Cell membrane
46. What is the main function of xylem in plants?
a) Transport water
47. What is the process of formation of gametes called?
a) Meiosis
48. Which hormone is secreted by the thyroid gland?
a) Thyroxine
49. Which organ stores bile in the human body?
a) Gallbladder
50. What is the end product of protein digestion?
a) Amino acids
51. Which substance protects the stomach lining from acid?
a) Mucus
52. What is the organ of balance in the human body?
a) Inner ear
53. Which disease is caused by the deficiency of vitamin B1?
a) Beriberi
54. What is the basic structural unit of the nervous system?
a) Neuron
55. Which organelle is involved in photosynthesis?
a) Chloroplast
56. What is the name of the joint in the shoulder?
a) Ball and socket joint
57. Which disease is caused by a virus?
a) Polio
58. What is the full form of ATP?
a) Adenosine triphosphate
59. What is the function of the large intestine?
a) Absorption of water
60. Which type of bacteria convert nitrogen into usable forms for plants?
a) Rhizobium
61. Which organ is affected by hepatitis?
a) Liver
62. What is the primary source of energy for living organisms?
a) Glucose
63. What are vestigial organs?
a) Organs with no apparent function
64. Which disease is caused by the deficiency of iron?
a) Anemia
65. Which blood group is the universal donor?
a) O-negative
66. What is the function of guard cells?
a) Control the opening and closing of stomata
67. Which type of reproduction produces genetically identical offspring?
a) Asexual reproduction
68. Which protein is responsible for blood clotting?
a) Fibrin
69. What is the term for the study of heredity?
a) Genetics
70. What is the causative agent of AIDS?
a) HIV
71. What is the major carbohydrate stored in plants?
a) Starch
72. What is the normal body temperature of humans?
a) 37°C
73. Which disease is spread by contaminated water?
74. Which organelle is responsible for packaging and transporting proteins?
a) Golgi apparatus
75. What is the term for organisms that feed on dead and decaying matter?
a) Saprophytes
76. Which tissue in plants is responsible for secondary growth?
a) Cambium
77. What is the outermost layer of a virus called?
a) Capsid
78. Which macromolecule is primarily broken down in the stomach?
a) Proteins
79. Which part of the brain controls voluntary actions?
a) Cerebrum
80. What is the excretory product of fish?
a) Ammonia
81. Which microorganism converts milk into curd?
a) Lactobacillus
82. Which hormone stimulates the ripening of fruits?
a) Ethylene
83. What type of blood do pulmonary veins carry?
a) Oxygenated blood
84. What is the main function of guard cells in plants?
a) Regulate stomatal opening
85. Which protein strengthens hair and nails?
a) Keratin
86. What is the scientific name of the human species?
a) Homo sapiens
87. Which process removes carbon dioxide from the atmosphere?
a) Photosynthesis
88. Which vitamin is necessary for blood clotting?
a) Vitamin K
88. Which disease is caused by the lack of vitamin C?
a) Scurvy
90. Which blood group is known as the universal recipient?
a) AB-positive
91. What is the term for plants that reproduce by spores?
a) Bryophytes
92. What is the process by which an organism regrows a lost body part?
a) Regeneration
93. What is the lifespan of a red blood cell in humans?
a) 120 days
94. Which enzyme breaks down fats into fatty acids and glycerol?
a) Lipase
95. Which disease is caused by a deficiency of vitamin D?
a) Rickets
96. What is the main source of energy for plants?
a) Sunlight
97. Which organ in the human body produces insulin?
a) Pancreas
98. Which part of the brain regulates body temperature?
a) Hypothalamus
99. What is the term for the study of tissues?
a) Histology
100. What is the excretory product of insects?
a) Uric acid
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