Frequently Asked Questions - Biology

Previous Year Questions (PYQs) from SSC, Railway, Banking & Government Exams

1. Who is considered the Father of Genetics?
RRC Group D 2022
Answer: Gregor Johann Mendel
2. Who is known as the Father of Biology?
SSC CHSL 2017 | SSC CPO 2017
Answer: Aristotle
3. Who is considered the Father of Taxonomy?
RRB ALP 2019
Answer: Carolus Linnaeus
4. Who is known as the Father of Cytology?
SSC Steno 2017
Answer: Robert Hooke
5. Who first gave a detailed description of Red Blood Cells (RBC) using a microscope?
CRPF Tradesman 2023
Answer: Antonie van Leeuwenhoek
6. Antonie van Leeuwenhoek is best known for the discovery of?
SSC CHSL 2022
Answer: Bacteria and Protozoa
7. Who is considered the founder of Homeopathy?
SSC CGL 2021
Answer: Samuel Hahnemann
8. Who discovered blood circulation?
RRC Allahabad 2013 | SSC MTS 2017 | SSC CHSL 2020, 2021
Answer: William Harvey
9. Who discovered cells?
SSC CGL 2020
Answer: Robert Hooke
10. Who discovered blood groups?
SSC CGL 2016 | SSC MTS 2017
Answer: Karl Landsteiner
11. Cytology is the study of?
SSC CHSL 2021
Answer: Cells
12. Mycology is the study of?
RRB JE 2019 | SSC Steno 2020
Answer: Fungi
13. The study of the timing of biological events in plants and animals is called?
SSC GD 2021
Answer: Phenology
14. What is the study of insects called?
SSC CGL 2022 | RRB Sikandrabad 2010 | SSC CGL 2021
Answer: Entomology
15. Herpetology is the study of?
SSC MTS 2020
Answer: Reptiles and Amphibians
16. Ichthyology is the study of?
SSC MTS 2020
Answer: Fishes
17. What is the scientific study of birds called?
SSC CGL 2020
Answer: Ornithology
18. Zoology is the scientific study of?
SSC GD 2021
Answer: Animals
19. Snails belong to which phylum?
DSSSB AE 2021 | SSC MTS Havaldar 2023
Answer: Mollusca
20. Earthworm belongs to which phylum?
RRB NTPC 2021 | SSC MTS 2021 | SSC CHSL 2023
Answer: Annelida
21. Salamanders belong to which class?
SSC CGL 2022
Answer: Amphibians
22. Cassowary, Kiwi and Rhea belong to which class?
SSC Selection Post Phase IX 2022
Answer: Aves
23. Hydra, Adamsia, Physalia and Corals belong to which animal group?
SSC CHSL 2021, 2023
Answer: Coelenterata
24. Which of the following is a mammal?
RRB Group D 2018 | SSC MTS 2021
Answer: Rat
25. Bilateral symmetry, degeneration, coelom and circulatory system are characteristics of which phylum?
SSC Steno 2022
Answer: Arthropoda
26. Sponges belong to which group of the animal kingdom?
SSC CHSL 2017 | SSC MTS 2020
Answer: Porifera
27. Cyclostomata belongs to which subphylum?
SSC GD 2022
Answer: Vertebrata
28. Octopus belongs to which phylum?
NTPC 2016 | SSC GD 2022
Answer: Mollusca
29. Cycas belongs to which plant group?
SSC CPO 2020
Answer: Gymnosperms
30. Scorpion belongs to which phylum?
RRB JE 2016 | SSC CGL 2021
Answer: Arthropoda
31. Bacteria, blue-green algae, cyanobacteria and mycoplasma belong to which kingdom?
SSC CHSL 2018
Answer: Monera
32. Parrots belong to which class?
SSC MTS 2021
Answer: Aves
33. Tapeworm belongs to which phylum?
SSC MTS 2021
Answer: Platyhelminthes
34. Amoeba belongs to which phylum?
SSC CHSL 2017
Answer: Protozoa
35. How many chambers are present in the heart of a fish?
NTPC Mains 2017 | RRB Group D 2018 | RRB Staff Nurse 2019 | SSC MTS Havaldar 2023
Answer: Two
36. Which animal breathes through its skin?
SSC GD 2021
Answer: Frog
37. How many chambers are present in the heart of birds?
RRB Group D 2018 | SSC MTS 2021
Answer: Four
38. Which insect contains the pigment luciferin?
SSC Steno 2019 | SSC GD 2021
Answer: Firefly
39. Which animal has three hearts?
SSC CGL 2021
Answer: Octopus
40. How many chambers are present in the heart of a crocodile?
SSC CGL 2020
Answer: Four
41. Where are the ears of a grasshopper located?
SSC CGL 2021
Answer: Stomach
42. Which tissue provides hardness to the coconut shell?
RRC Group D 2022
Answer: Sclerenchyma
43. Which sulphur-containing compound is present in garlic and onion?
SSC MTS 2021
Answer: Allicin
44. Which pigment gives onion its red colour?
SSC CHSL 2021
Answer: Anthocyanin
45. Which pigment gives carrots their orange colour?
SSC CHSL 2017
Answer: Carotene
46. Which is the smallest flowering plant in the world?
Frequently Asked Question
Answer: Wolffia globosa
47. Which is the largest flower in the world?
Frequently Asked Question
Answer: Rafflesia arnoldii
48. Which is the largest seed in the world?
Frequently Asked Question
Answer: Lodoicea (Coco de Mer)
49. Which is the smallest seed in the world?
Frequently Asked Question
Answer: Orchid Seed
50. Which is the largest living mammal in the world?
Frequently Asked Question
Answer: Blue Whale
51. Which is the largest land animal in the world?
Frequently Asked Question
Answer: African Elephant
52. Which is the tallest animal in the world?
Frequently Asked Question
Answer: Giraffe
53. Which is the only flying mammal in the world?
Frequently Asked Question
Answer: Bat
54. Which is the largest bird in the world?
Frequently Asked Question
Answer: Ostrich
55. Which is the smallest bird in the world?
Frequently Asked Question
Answer: Bee Hummingbird
56. Which is the largest butterfly in the world?
Frequently Asked Question
Answer: Alexandra's Birdwing
57. Which is the largest bee in the world?
Frequently Asked Question
Answer: Wallace's Giant Bee
58. Which is the largest living lizard in the world?
Frequently Asked Question
Answer: Komodo Dragon
59. Which animal has the largest heart in the world?
Frequently Asked Question
Answer: Blue Whale
60. Which is the longest and largest poisonous snake in the world?
Frequently Asked Question
Answer: King Cobra
61. Which is the biggest snake in the world?
Frequently Asked Question
Answer: Anaconda
62. Which is the largest organ in the human body?
SSC CHSL 2017
Answer: Skin
63. What is the outermost layer of the skin?
SSC CHSL 2017
Answer: Epidermis
64. Which is the longest vein in the human body?
SSC CPO SI 2016
Answer: Saphenous Vein
65. Which is the longest muscle in the human body?
SSC CPO SI 2016
Answer: Sartorius Muscle
66. Soft bones in adults due to Vitamin D deficiency is called?
SSC CHSL 2022
Answer: Osteomalacia
67. Osteoporosis is mainly caused by the deficiency of which mineral?
SSC JE 2021
Answer: Calcium
68. Osteoporosis and arthritis mainly affect which organs?
SSC Steno 2020
Answer: Bones and Joints
69. Gout arthritis is caused by the excess formation of which substance?
Frequently Asked Question
Answer: Uric Acid
70. Which gland secretes Oxytocin?
Frequently Asked Question
Answer: Pituitary Gland
71. Which hormone regulates the sleep-wake cycle?
Frequently Asked Question
Answer: Melatonin
72. Which gland secretes Adrenaline?
Frequently Asked Question
Answer: Adrenal Gland
73. Which hormone prepares the body for "Fight or Flight"?
Frequently Asked Question
Answer: Adrenaline
74. Which hormone promotes the growth and maturation of female reproductive organs?
Frequently Asked Question
Answer: Estrogen
75. Which hormone is responsible for male secondary sexual characteristics and sperm production?
Frequently Asked Question
Answer: Testosterone
76. Which hormone prepares the uterus for implantation and maintains pregnancy?
Frequently Asked Question
Answer: Progesterone
77. Thyroxine hormone is synthesized using which element?
RRC Sikandrabad 2013 | SSC MTS 2021
Answer: Iodine
78. Which hormone is secreted by the Pineal Gland?
SSC Steno 2020, 2021 | SSC GD 2021
Answer: Melatonin
79. Where is the Adrenal Gland located?
SSC GD 2021
Answer: Above the Kidneys
80. Which organ secretes bile juice?
SSC MTS 2022
Answer: Liver
81. Which organ stores bile juice?
SSC MTS 2022
Answer: Gall Bladder
82. Which gland secretes insulin?
SSC CHSL 2020
Answer: Pancreas
83. Which hormone regulates the blood sugar level in the human body?
SSC GD 2021
Answer: Insulin
84. Which gland is known as the Master Gland?
SSC CGL 2020
Answer: Pituitary Gland
85. Which is the largest gland in the human body?
SSC CHSL 2019
Answer: Liver
86. Which is the largest endocrine gland in the human body?
SSC MTS 2021
Answer: Thyroid Gland
87. Which gland secretes Thyroxine hormone?
SSC GD 2021
Answer: Thyroid Gland
88. Which gland secretes Parathormone?
SSC CHSL 2021
Answer: Parathyroid Gland
89. Which gland secretes Growth Hormone (GH)?
SSC MTS 2022
Answer: Pituitary Gland
90. Which gland secretes Calcitonin?
SSC GD 2022
Answer: Thyroid Gland
91. Which blood group is known as the Universal Donor?
SSC CGL 2022 | RRB NTPC 2021
Answer: O Negative (O−)
92. Which blood group is known as the Universal Recipient?
SSC CHSL 2021
Answer: AB Positive (AB+)
93. Which blood cells help in blood clotting?
SSC MTS 2021
Answer: Platelets
94. Which blood cells help in body defence?
SSC GD 2021
Answer: White Blood Cells (WBC)
95. Which blood cells transport oxygen?
SSC CHSL 2022
Answer: Red Blood Cells (RBC)
96. What is the normal pH of human blood?
SSC JE 2021
Answer: 7.4
97. Which protein is present in Red Blood Cells?
SSC CGL 2021
Answer: Haemoglobin
98. Which mineral is essential for the formation of haemoglobin?
SSC MTS 2022
Answer: Iron
99. Which vitamin is essential for blood clotting?
SSC GD 2022
Answer: Vitamin K
100. Which vitamin helps in the absorption of calcium?
SSC CHSL 2021
Answer: Vitamin D
101. Which gland is known as the Master Gland?
SSC CGL 2019
Answer: Pituitary Gland
102. Which enzyme is present in saliva?
RRC Group D 2022 | SSC CHSL 2022
Answer: Amylase (Ptyalin)
103. Which enzyme breaks down starch in saliva?
SSC CHSL 2021 | SSC GD 2022
Answer: Amylase
104. Which pancreatic enzyme digests proteins?
SSC MTS 2019
Answer: Trypsin
105. Which enzyme digests proteins in the stomach?
SSC CGL 2016
Answer: Pepsin
106. Vitamins and minerals are mainly helpful for what?
SSC CHSL 2021 | SSC CGL 2023
Answer: Metabolic Reactions
107. Which is the only water-soluble vitamin stored in the liver?
SSC MTS 2020
Answer: Vitamin B₁₂
108. Which vitamin helps in iron absorption?
CRPF MTS & Havildar 2022
Answer: Vitamin C
109. Beri-Beri is caused by the deficiency of which vitamin?
SSC 2022–23
Answer: Vitamin B₁ (Thiamine)
110. Which vitamin is essential for vision?
CRPF MTS 2022
Answer: Vitamin A
111. Xerophthalmia is caused by the deficiency of which vitamin?
SSC CGL 2022
Answer: Vitamin A
112. Night Blindness is caused by the deficiency of which vitamin?
SSC 2020–22
Answer: Vitamin A
113. Vitamin D deficiency occurs due to inadequate exposure to what?
CRPF MTS 2022
Answer: Sunlight
114. Which vitamins are mainly found in fruits and vegetables?
CRPF Tradesman 2023
Answer: Vitamins A and B
115. What is another name of Riboflavin?
SSC GD 2021
Answer: Vitamin B₂
116. Infertility is caused by the deficiency of which vitamin?
RRB NTPC 2021
Answer: Vitamin E
117. Which vitamin-dependent carboxylase is found in the liver?
SSC Selection Post 2022
Answer: Vitamin K
118. Which vitamin is also called Cyanocobalamin?
SSC MTS 2021
Answer: Vitamin B₁₂
119. Which is the water-soluble vitamin?
SSC CHSL 2020 | SSC CGL 2021
Answer: Vitamin B
120. What is another name of Vitamin K₁?
SSC GD 2021
Answer: Phylloquinone
121. Scurvy is caused by the deficiency of which vitamin?
SSC JE 2020
Answer: Vitamin C
122. Pellagra is caused by the deficiency of which vitamin?
RRB JE 2019
Answer: Vitamin B₃ (Niacin)
123. Deficiency of which mineral causes weak bones and tooth decay?
SSC GD 2023
Answer: Calcium
124. Deficiency of which mineral causes Tetany?
RRB ALP 2018
Answer: Calcium
125. People with high blood pressure should avoid which mineral?
SSC Tradesman 2023
Answer: Sodium
126. How much magnesium is present in a normal adult human body?
SSC CGL 2021
Answer: About 25 grams
127. What is the recommended daily intake of nutrients for teenagers?
SSC GD 2022
Answer: Three (Nutrients, Vitamins & Minerals)
128. Fast foods are typically high in what?
SSC GD 2022
Answer: Supplemented Calories
129. One gram of protein provides how many kilocalories?
SSC GD 2022
Answer: 4 kcal
130. Excessive accumulation of cadmium causes which disease?
RRB Group D 2018 | SSC CHSL 2022
Answer: Itai-Itai Disease
131. Why is water fluoridation done?
SSC CGL 2021
Answer: To Prevent Tooth Decay
132. Which instrument measures pressure inside the eye?
SSC CGL 2021
Answer: Tonometer
133. Who discovered diagnostic ultrasound?
SSC CGL 2017
Answer: Ian Donald
134. Which instrument is used to measure blood pressure?
SSC CHSL 2017
Answer: Sphygmomanometer
135. Which instrument is used to listen to heart and lung sounds?
SSC MTS 2021
Answer: Stethoscope
136. Widal Test is used to detect which disease?
SSC CGL 2016
Answer: Typhoid
137. Bulimia is best described as what?
SSC CGL 2023
Answer: Eating Disorder
138. Diseases that last for a short period are called?
SSC CGL 2023
Answer: Acute Diseases
139. Body odour during humid summers is mainly caused by what?
SSC CGL 2022
Answer: Bacteria
140. Severe malnutrition in children is called?
SSC CPO SI 2022
Answer: Kwashiorkor
141. Leprosy is caused by which bacterium?
SSC CHSL 2021
Answer: Mycobacterium leprae
142. Drinking contaminated water mainly causes which disease?
SSC/RRB Various
Answer: Cholera
143. What is another name for Whooping Cough?
RRB JE 2019
Answer: Pertussis
144. Which organ is mainly affected by Tuberculosis (TB)?
RRB JE 2019
Answer: Lungs
145. Jaundice occurs due to excess of which pigment?
SSC JE 2020
Answer: Bilirubin
146. Diabetes mainly affects which organ?
RRB JE 2019
Answer: Pancreas
147. Trachoma affects which organ?
SSC MTS 2021
Answer: Eyes
148. Hemophobia is the fear of what?
SSC CGL 2020
Answer: Blood
149. Uveitis is a disease of which organ?
SSC JE 2021
Answer: Eye
150. Thalassemia is what type of disease?
SSC JE 2021
Answer: Hereditary Blood Disorder
151. Optic nerve damage leading to gradual vision loss occurs in which disease?
SSC CGL 2019
Answer: Glaucoma
152. Common Cold is caused by which virus?
SSC Selection Post 2022
Answer: Rhinovirus
153. Chickenpox is what type of disease?
SSC MTS 2021
Answer: Viral Disease
154. Hepatitis B mainly affects which organ?
SSC GD 2021
Answer: Liver
155. Zika Virus is spread by which mosquito?
RRB/SSC Various
Answer: Aedes Mosquito
156. Herpes is what type of disease?
SSC GD 2021
Answer: Viral Disease
157. Chickenpox is caused by which virus?
SSC CGL 2020
Answer: Varicella Zoster Virus
158. AIDS destroys which system of the human body?
RRB JE 2019
Answer: Immune System
159. Influenza is caused by what?
SSC JE 2018
Answer: Virus
160. Poliomyelitis is caused by what?
SSC CHSL 2017
Answer: Virus
161. Zika Virus damages the brain of the foetus and is transmitted by which organism?
RRB NTPC 2016
Answer: Mosquito
162. Sleeping Sickness is caused by which protozoan?
SSC CHSL 2022
Answer: Trypanosoma brucei
163. Kala-azar is caused by which protozoan?
SSC CHSL 2021
Answer: Leishmania
164. Sleeping Sickness is caused by which type of organism?
RRB Group D 2018
Answer: Protozoa
165. Malaria spreads through the bite of which mosquito?
SSC CHSL 2021
Answer: Female Anopheles Mosquito
166. Ringworm is caused by what?
SSC MTS 2020
Answer: Fungus
167. What is the primary host of the malaria parasite?
SSC MTS 2019
Answer: Female Anopheles Mosquito
168. Elephantiasis is caused by which worm?
RRB Group D 2018
Answer: Filarial Worm
169. Athlete's Foot is caused by what?
SSC MTS 2021
Answer: Fungus
170. Who discovered the Anthrax Vaccine?
SSC JE 2021
Answer: Louis Pasteur
171. Who discovered the Tuberculosis (BCG) Vaccine?
SSC MTS 2021
Answer: Leon Calmette & Camille Guérin
172. Who discovered the Smallpox Vaccine?
SSC MTS 2019
Answer: Edward Jenner
173. Who developed the Polio Vaccine?
SSC CPO SI 2019 | SSC CGL 2021
Answer: Jonas Salk
174. Who discovered Penicillin?
SSC CGL 2019
Answer: Alexander Fleming
175. The DPT Vaccine provides immunity against which diseases?
RRB SSE 2014 | RRB JE 2019
Answer: Diphtheria, Pertussis (Whooping Cough) and Tetanus