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Biology
Practice questions 1-25
1. Who is known as the Father of Biology? – Aristotle
2. What is the basic unit of life? – The Cell
3. Which pigment gives plants their green color? – Chlorophyll
4. What is the powerhouse of the cell? – Mitochondria
5. Which blood cells fight infections in the human body? – White Blood Cells (WBC)
6. What is the scientific name of humans? – Homo sapiens
7. Which organ in the human body produces insulin? – Pancreas
8. The largest gland in the human body is? – Liver
9. Which vitamin is produced when skin is exposed to sunlight? – Vitamin D
10. DNA stands for? – Deoxyribonucleic Acid
11. Which blood group is known as the universal donor? – O Negative
12. The study of fungi is called? – Mycology
13. The largest organ in the human body is? – Skin
14. Which part of the plant conducts photosynthesis? – Leaf
15. What is the structural and functional unit of the kidney? – Nephron
16. What is the normal temperature of the human body in Celsius? – 37°C
17. The process by which plants lose water vapor is called? – Transpiration
18. The heart of a human has how many chambers? – Four
19. Who discovered penicillin? – Alexander Fleming
20. Which vitamin deficiency causes night blindness? – Vitamin A
21. Which animal is called the ship of the desert? – Camel
22. Which organ purifies blood in the human body? – Kidney
23. The longest bone in the human body is? – Femur
24. Name the only mammal capable of tr
ue flight. – Bat
25. What is the study of heredity called? – Genetics
Practice questions 26-65
26. Which vitamin helps in blood clotting? – Vitamin K
27. Which blood group is called the universal recipient? – AB Positive
28. Which disease is caused by deficiency of Vitamin C? – Scurvy
29. Which animal lays the largest egg? – Ostrich
30. What is the study of birds called? – Ornithology
31. Which plant is known as the “queen of spices”? – Cardamom
32. Which part of the human brain controls balance? – Cerebellum
33. What is the normal pH of human blood? – Around 7.4
34. Which animal is known as the fastest land animal? – Cheetah
35. Which insect spreads malaria? – Female Anopheles mosquito
36. Which vitamin deficiency causes rickets? – Vitamin D
37. What is the red pigment in red blood cells called? – Hemoglobin
38. What is the study of insects called? – Entomology
39. Which plant is the main source of quinine? – Cinchona
40. What is the lifespan of a red blood cell? – 120 days
41. Which disease is also called Hansen’s disease? – Leprosy
42. Which enzyme is present in saliva? – Amylase
43. Which animal has the longest lifespan? – Tortoise
44. Which vitamin is also known as ascorbic acid? – Vitamin C
45. Which is the largest bird in the world? – Ostrich
46. Which organ stores bile in the human body? – Gallbladder
47. Which part of the plant absorbs water and minerals? – Root
48. Which animal is known as the king of the jungle? – Lion
49. What is the study of fossils called? – Palaeontology
50. Which gland is known as the “master gland”? – Pituitary gland
51. Which metal is present in chlorophyll? – Magnesium
52. What type of blood circulation do humans have? – Double circulation
53. Which virus causes AIDS? – HIV (Human Immunodeficiency Virus)
54. Which animal has a three-chambered heart? – Frog
55. Which vitamin deficiency causes beriberi? – Vitamin B1 (Thiamine)
56. What is the scientific study of cells called? – Cytology
57. Which animal can survive without drinking water? – Camel
58. Which blood cells are called “soldiers of the body”? – White Blood Cells
59. Which disease is caused by deficiency of iodine? – Goitre
60. What is the study of algae called? – Phycology
61. Which is the smallest bone in the human body? – Stapes (in ear)
62. What type of blood circulation is found in fishes? – Single circulation
63. Which protein is present in hair and nails? – Keratin
64. Which
vitamin helps in calcium absorption? – Vitamin D
65. Which human organ has the fastest healing ability? – Skin
Practice questions 66-105
66. Which organelle is known as the control center of the cell? – Nucleus
67. What is the fluid part of blood called? – Plasma
68. Which animal is known as the national aquatic animal of India? – Dolphin
69. Which part of the plant contains seeds? – Fruit
70. What is the study of bacteria called? – Bacteriology
71. Which hormone regulates blood sugar level? – Insulin
72. Which animal is called the ‘flying fox’? – Bat
73. Which part of the human eye controls the amount of light entering? – Iris
74. What is the main function of red blood cells? – Transport oxygen
75. Which part of the human body is affected by pneumonia? – Lungs
76. Which organ in the human body produces bile? – Liver
77. Which vitamin prevents scurvy? – Vitamin C
78. Which animal is known as the national bird of India? – Peacock
79. What is the largest internal organ in the human body? – Liver
80. Which organ helps in the production of sound? – Larynx (Voice box)
81. Which plant is known as the “lung of the Earth”? – Amazon Rainforest (Trees)
82. Which hormone is called the “fight or flight” hormone? – Adrenaline
83. What is the average human blood volume? – 5 to 6 liters
84. What is the study of reptiles and amphibians called? – Herpetology
85. Which vitamin helps in improving eyesight? – Vitamin A
86. Which human organ has the ability to regenerate? – Liver
87. What is the largest mammal in the world? – Blue Whale
88. Which blood cells help in clotting? – Platelets
89. Which insect produces honey? – Honeybee
90. Which gas is released during respiration? – Carbon dioxide
91. Which part of the human skeleton protects the brain? – Skull
92. Which organ is responsible for pumping blood? – Heart
93. What is the study of fish called? – Ichthyology
94. Which disease is caused by Plasmodium parasite? – Malaria
95. Which organ in the human body is affected by jaundice? – Liver
96. Which pigment is responsible for the color of blood? – Hemoglobin
97. What is the scientific name of the tiger? – Panthera tigris
98. Which vitamin deficiency causes pellagra? – Vitamin B3 (Niacin)
99. What is the normal heartbeat rate in humans? – 72 beats per minute (approx.)
100. Which gas do plants release during photosynthesis? – Oxygen
101. What is the green pigment in plants? – Chlorophyll
102. Which is the largest animal on land? – African Elephant
103. Which hormone is also called growth hormone? – Somatotropin
104. Which vitamin helps in strengthening bones? – Vitamin D
105. Which plant is the main source of rubber? – Rubber tree (Hevea brasiliensis)
Practice questions 106-145
106. Which organ in the human body filters waste from the blood? – Kidney
107. Which organ in the body regulates body temperature? – Skin
108. Which is the largest nerve in the human body? – Sciatic nerve
109. What is the life span of white blood cells? – 13–20 days
110. Which blood cells carry oxygen? – Red Blood Cells (RBCs)
111. Which is the only snake that builds a nest? – King Cobra
112. Which hormone is known as the “love hormone”? – Oxytocin
113. Which vitamin deficiency causes scurvy? – Vitamin C
114. Which animal has a pouch to carry its young ones? – Kangaroo
115. Which is the largest land carnivore? – Polar Bear
116. Which is the smallest bird in the world? – Hummingbird
117. What is the normal blood pressure of humans? – 120/80 mmHg
118. Which animal is known as the national animal of India? – Tiger
119. Which blood group is rarest in humans? – AB Negative
120. Which hormone controls sleep? – Melatonin
121. Which part of the brain controls breathing and heartbeat? – Medulla oblongata
122. Which human organ is responsible for detoxification? – Liver
123. Which insect spreads dengue fever? – Aedes aegypti mosquito
124. What is the structural unit of the nervous system? – Neuron
125. Which pigment gives skin its color? – Melanin
126. Which part of the plant anchors it to the soil? – Roots
127. Which animal can change its body color? – Chameleon
128. Which vitamin is essential for blood clotting? – Vitamin K
129. Which animal has no backbone? – Invertebrates
130. Which is the largest invertebrate? – Giant Squid
131. Which organ helps fish in breathing? – Gills
132. Which bird can rotate its head 270 degrees? – Owl
133. Which is the heaviest flying bird? – Kori Bustard
134. Which vitamin is also known as calciferol? – Vitamin D
135. Which part of the cell contains genetic material? – Nucleus
136. Which enzyme digests protein in the stomach? – Pepsin
137. Which animal produces pearls? – Oyster
138. Which blood cells help fight infections? – White Blood Cells
139. Which disease is caused by deficiency of insulin? – Diabetes
140. Which organ stores urine? – Urinary bladder
141. Which gas is exhaled during respiration? – Carbon dioxide
142. Which insect is called a “living fossil”? – Cockroach
143. Which blood component transports nutrients? – Plasma
144. Which bird is a symbol of peace? – Dove
145. Which part of the body controls reflex actions? – Spinal cord
Practice questions 146-185
146. Which part of the human body produces insulin? – Pancreas
147. Which vitamin helps in calcium absorption? – Vitamin D
148. Which blood group is a universal donor? – O Negative
149. Which is the strongest muscle in the human body (by weight)? – Masseter (jaw muscle)
150. Which part of the brain is responsible for memory? – Hippocampus
151. Which organ purifies blood in the human body? – Kidney
152. Which part of the body contains the smallest bone? – Ear (Stapes bone)
153. Which animal has the largest brain? – Sperm Whale
154. Which is the fastest land animal? – Cheetah
155. Which bird lays the largest eggs? – Ostrich
156. Which vitamin prevents night blindness? – Vitamin A
157. Which organ in plants carries out photosynthesis? – Leaves
158. Which is the longest bone in the human body? – Femur
159. Which part of the human eye controls the amount of light entering? – Iris
160. Which hormone regulates blood sugar? – Insulin
161. Which is the only mammal capable of true flight? – Bat
162. Which is the largest gland in the human body? – Liver
163. Which pigment is found in red blood cells? – Hemoglobin
164. Which vitamin is produced in the skin with sunlight? – Vitamin D
165. Which human organ can regenerate itself? – Liver
166. Which plant is called “the king of fruits”? – Mango
167. Which insect is called the “queen of sting”? – Honeybee
168. Which disease is caused by a deficiency of Vitamin B1? – Beriberi
169. Which plant is known as the “ship of the desert”? – Cactus
170. Which animal is the largest mammal? – Blue Whale
171. Which organ is affected by hepatitis? – Liver
172. Which insect carries malaria? – Female Anopheles mosquito
173. Which blood cells help in blood clotting? – Platelets
174. Which plant gives us cotton? – Cotton plant
175. Which food is rich in protein? – Eggs
176. Which animal produces silk? – Silkworm
177. Which disease is also known as “lockjaw”? – Tetanus
178. Which gas is essential for respiration in humans? – Oxygen
179. Which vitamin deficiency causes rickets? – Vitamin D
180. Which part of the plant absorbs water? – Roots
181. Which blood vessels carry blood away from the heart? – Arteries
182. Which blood vessels carry blood to the heart? – Veins
183. Which animal is known as the ship of the desert? – Camel
184. Which is the fastes
t bird in the world? – Peregrine Falcon
185. Which organ is transplanted in a corneal transplant? – Eye cornea
Important questions and their answers related to natural science.
Earth Science & Astronomy
Chemistry
Physics
Biology..........๐
