Biology – Science – WBCS Main Question Paper

Biology - Science - WBCS Main Question Paper
wbcs main biology question paper

WBCS Main Question Paper – 2019

10. The following virus is water borne:
(A) Hepatitis A
(B) Hepatitis B
(C) Hepatitis C
(D) Hepatitis E
 
14. The following organism is an endosymbiont:
(A) Anabaena
(B) Azatobacter
(C) Clostridium
(D) Nitrobacter
 
17. The black foot disease primarily occurs due
to toxicity of
(A) Fluoride
(B) Cadmium
(C) Arsenic
(D) Lead
 
19. The following is not a macronutrient:
(A) Mg
(B) Ca
(C) Fe
(D) K
 
104. A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed, the objective of this is
(A) to improve its taste and nutritive qualities.
(B) to make it pest-resistant.
(C) to make it drought-resistant.
(D) to make its shelf-life longer
 
107. Proteins are composed of
(A) vitamins
(B) carbohydrates
(C) α-amino acids
(D) mineral salts
 
111. Indusium is found in
(A) algae
(B) moss
(C) ferns
(D) cycas
 
112. In plants, water supply is due to
(A) osmosis
(B) imbibition
(C) guttation
(D) adhesion force
 
113. In which form does the food transported in plants?
(A) Sucrose
(B) Fructose
(C) Glucose
(D) Lactose
 
120. Which of the following is not vestigial in man?
(A) Tail vertebrae
(B) Nails
(C) Nictitating membrane
(D) Vermiform appendix
121. The vitamin which is essential for blood clotting is
(A) vitamin – A
(B) vitamin – B
(C) vitamin – C
(D) vitamin – K
 
122. Kupffer cells are present in
(A) Pancreas
(B) Liver
(C) Thyroid
(D) Small intestine
 
123. In blood, CO2 is transported majorly as
(A) C02 as such
(B) Sodium Carbonate
(C) Bicarbonate
(D) Carboxy hemoglobin
 
124. Which is correctly matched?
(A) Apiculture – Honey bee
(B) Pisciculture – Silk moth
(C) Sericulture – Fish
(D) Aquaculture – Mosquito
 
125. Which of the following is the largest gland in an adult man?
(A) Thymus
(B) Liver
(C) Thyroid
(D) Pancreas
 
126. Protein folding is a process in which a polypeptide folds into
(A) 2-D structure
(B) Globular form
(C) 3-D structure
(D) Linear form
 
127. Who described the structure of DNA double helix?
(A) Peter Mitchell
(B) Andre Jagendorf
(C) Ernest Uribe
(D) Watson and Crick
 
146. Which of the following vitamin is water soluble as well as an antioxidant?
(A) Vitamin – B1
(B) Vitamin – A
(C) Vitamin – D
(D) Vitamin – C
 
147. ‘Adaptation’ of eyes in dark due to
(A) depletion of vision pigment in rods
(B) depletion of vision pigment in cones
(C) repletion of vision pigment in rods
(D) repletion of vision pigment in cones
 
148. A man of blood group-A marries a woman of blood group-AB, which type of progeny would indicate that man is heterozygous?
(A) O
(B) B
(C) A
(D) AB
150. Aspirin is a/an
(A) antibiotic
(B) antiseptic
(C) antipyretic
(D) None of the above
 
181. Which of them contains all the information required to fold the polypeptide chain in its 3-D structure?
(A) DNA sequences
(B) RNA
(C) Histone protein
(D) Amino acid sequences
 
182. Name the RNA molecules which is used to carry genetic information copied from DNA?
(A) tRNA
(B) mRNA
(C) rRNA
(D) snRNA
 
183. Name the disease caused by the deficiency of Niacin.
(vitamin B3)
(A) Pellagra
(B) Rickets
(C) Scurvy
(D) Pernicious anemia
 
191. Which of the following vitamin serves as a hormone precursor?
(calcitriol hormone)
(A) Vitamin – C
(B) Vitamin – A
(C) Vitamin – K
(D) Vitamin – D    
 
192. Which of the following is not a component of the nucleus?
(A) Chromosome
(B) Nucleolus
(C) Cytoplasm
(D) Nuclear envelope
 
 

WBCS Main Question Paper – 2018

1. Which is the most balanced diet ?
a) Rice     
b) Milk
c) Meat   
d) Fish
 
2. Carbohydrate stored in the body as
a) Glucose
b) starch
c) glycogen
d) sucrose
 
3. Quinine is extracted from the plant of
a) Poppy
b) Cinchona
c) Sandle wood
d) Palm
 
28. The human eye forms the image of an object at is
a) retina
b) cornea
c) iris
d) None of the above
 
46. The normal blood pressure of human beings should remain in the range of
a) 120/ 80 mm
b) 110/ 70 mm
c) 140/ 80 mm
d) 110/ 60 mm
 
47. Universal recipient blood group is
a) AB   
b) O
c) B      
d) A
 
48. In medicine bottles containing capsules and tables, a pouch of SiO2 gel is kept
a) to kill bacteria
b) to absorb bacteria
c) to keep bottle warm
d) to absorb moisture
 
49. Which one of the following is considered as good cholesterol ?
a) VLDL
b) LDL
c) HDL
d) Triglycerides
 
50. Goiter is caused by the deficiency of
a) Vitamin A
b) Vitamin D
c) Iodine
d) None of the above
 
53. Plant absorbs dissolved nitrates from soil and converts them into
a) free N2
b) urea
c) ammonia
d) proteins
82. The heart rate of adult persons should remain in the range of
a) 50-60 times per minute
b) 70-80 times per minute
c) 40-50 times per minute
d) 90-100 times per minute
 
84. The method by which desired characters of two plants can be combined:
a) Cutting
b) Layering
c) Budding
d) Grafting
 
85. Which organ is not controlled by autonomous nervous system?
a) Heart
b) Uterus
c) Glands
d) Eyes
 
98. Blood is filtered in the body through
a) Liver
b) Kidney
c) Lungs
d) None of the above
 
99. Chlorophyll contains
a) Zinc
b) Iron
c) Magnesium
d) Cobalt
 
192. White lung cancer is caused by
(A) Asbestos      
(B) Silica       
(C) Paper            
(D) Textile
 
194. In photosynthesis, chlorophyll of green plants reacts with CO2 and H2O in presence of sunlight to generate
(A) N2       
(B) O2      
(C) H2      
(D) Cl2
 
195. Worst possible rays responsible for cell mutation and cancer:
(A) ß-rays       
(B) α-rays       
(C) γ-rays      
(D) X-rays
 
198. The scavengers of the earth is 
(A) Bacteria       
(B) Viruses        
(C) Algae       
(D) Fungi
 
 

WBCS Main Question Paper – 2017

133. Which one of the following clay has the highest cation exchange capacity (CEC) ?
(A) Bentonite     
(B) Halloysite       
(C) Ball clay       
(D) China clay
 
134. The diameter of a human hair is about
(A) 50 µm        
(B) 50 nm         
(C) 100 µm       
(D) 100 nm
 
135. Young of cockroaches is called
(A) Ephyra         
(B) Nymphs       
(C) Maggot       
(D) Juvenile
 
136. The study of the microscopic structure of tissues, is called
(A) Orology      
(B) Osteology       
(C) Histology      (microanatomy)
(D) Seromology
 
137. Ornithology is the study of
(A) Mammal       
(B) Bat       
(C) Fishes        
(D) Birds
 
138. Leaf spot disease of rice is caused by
(Cochliobolus miyabeanus)
(A) Fungus       
(B) Bacteria       
(C) Virus       
(D) None of the above
 
139. Black heart of potato is due to
(A) deficiency of copper
(B) deficiency of boron
(C) deficiency of oxygen
(D) deficiency of potassium
 
140. The cell wall of xylem cells is rich in
(A) Starch       
(B) Protein        
(C) Lipid       
(D) Lignin
 
141. Growth movement in plant due to light is called
(A) Thigmotropism        
(B) Phototropism       
(C) Geotropism       
(D) Hydrotropism
 
142. Which of the following is used as bio-fertilizer ?
(A) Azolla       
(B) Urea       
(C) Bagasse       
(D) Clostridium
 
143. Red colour of red sea is due to
(blue-green algae)
(A) Moss       
(B) Bacteria        
(C) Fungi        
(D) Algae
 
144. Bacteria was discovered first by
(A) Leeuwenhoek    (1676)  
(B) Louis Pasture       
(C) Robert Hook      
(D) Robert Koch
 
145. Who is known as father of taxonomy ?
(A) Angler      
(B) Aristotle        
(C) Linnaeus       
(D) Charles Darwin
 
146. Spermology is the study of
(A) Leaf       
(B) Pollen grain      
(C) Fruit      
(D) Seed
 
150. Vitamin B12 is also known as
(cobalamin)
(A) Pyridoxine       
(B) Ascorbic acid        
(C) Riboflavin       
(D) None of the above
 
 

WBCS Main Question Paper – 2016

123. ‘Equus Caballus’ is the scientific name of –
(A) Cow         
(B) Horse         
(C) Cat        
(D) Tiger
 
154. Rasy Periwinkle gives the drug for –
(A) malaria        
(B) blood cancer      
(C) hyper tension       
(D) anaemia
 

WBCS Main Question Paper – 2015

5.  The deficiency of cobalt causes the deficiency of
(A) Vitamin B2        
(B) Vitamin B6       
(C) Vitamin B12       
(D) Vitamin C
 
6.  Lead blocks the biosynthesis of
(A) Muscle protein       
(B) Myaglobin          
(C) Haemoglobin        
(D) Ossein
 
11.  Single cell animals reproduce by
(binary fission)
(A) Fission       
(B) Fusion       
(C) Budding       
(D) Regeneration
 
12.  The basic unit of life is
(A) Nucleic acid       
(B) Protein       
(C) Gene      
(D) Lipoprotein
 
13.  Which of the following is natural polymer ?
(condensation polymer)
(A) Terylene      
(B) Orion       
(C) Starch      
(D) Dacron
 
14.  The amino acids are basis units of
(A) Lipids      
(B) Hormones         
(C) Proteins      
(D) Vitamins
 
21.  Human body’s main organ of balance is located in
(A) Inner part of ear       
(B) Spine        
(C) Brain (front part)       
(D) Pituitary gland
 
22.  Chemically hormones are
(A) Amino Acids      
(B) Fatty Acids        
(C) Proteins        
(D) Steroids
 
23.  Blood pressure is under control of
(A) Adrenal        
(B) Pituitary       
(C) Thyroid        
(D) Aldosterone
 
24.  Animal with a single nostril is
(A) Whale       
(B) Tortoise        
(C) Python       
(D) Shark
25.  In proportion of the size of the body which birds lay largest sized eggs.
(A) Ostrich         
(B) Tinamons       
(C) Vulture        
(D) Kiwi
 
9. Among which of the following one lays eggs and does not produce young ones directly
(A) Echidna
(B) Kangaroo
(C) Porcupine
(D) Whale
 
10. Location of particular gene on sex chromosome of autosomes can be identified by
(A) Test cross
(B) Out cross
(C) Back cross
(D) Reciprocal cross
 
11. In vitro fertilisation is a technique that involves transfer of which of the following in the fallopian tube?
(A) Zygote only
(B) Embryo up to 8 cell stage
(C) Embryo of 32 cell stage
(D) Either zygote of embryo up to 8 cell stage
 
12. Which type of cells are involved in allergic response
(A) Basophils
(B) Mast cell
(C) Fibroblast cell
(D) Both (A) and (B)
 
13. All are Oncogenic virus except
A) HIV
B) Varicella Zoster Virus
C) Influenza Virus
D) Hepatitis-B
 
14. Which of the following is a congenital anaemic disorder?
A) Thalassemia
B) Sickle cell anemia
C) G-6 PD deficiency
D) All of the above
 
17. Which of the vitamins acts as a free-radical inhibitor in human body?
(A) Vitamin B1
(B) Vitamin C
(C) Vitamin E
(D) Both B & C
 
18. Which of the following enzyme is present in saliva
(A) Pepsin
(B) Trypsin
(C) Ptyalin
(D) Chymotryspin
 
26. Human body requires some minerals for contraction of muscles
(A) Calcium, Potassium
(B) Iron
(C) Calcium, Sodium
(D) Calcium, Sodium and Iron
47. Robert Webster is known for his work associated with
(A) Cardiology
(B) Influenza virus
(C) HIV/AIDS
(D) Alzheimer
 
64. Competitive exclusion principle was also denoted by
(A) Darwin
(B) Gause
(C) Odum
(D) Wallace
 
67. Life in the earth started from
(A) DNA
(B) Polypeptide
(C) RNA
(D) Conjugate protein
 
77. Study of birds is also called
(A) Ornithology
(B) Nidology
(C) Phenology
(D) Ecology
 
78. Salmon fishes are also called
(A) Bony fishes
(B) Trout
(C) Cod
(D) Star fish
 
79. Malarial parasite could best be obtained from a patient
(A) One hour before rise of temperature
(B) In state of shivering
(C) When temperature come normal
(D) 4 hours after the temperature reaches normal
 
80. Malignant malaria is caused by
(A) Plasmodium ovale
(B) Plasmodium falciparum
(C) Plasmodium vivax
(D) Plasmodium malarie
 
105. Essential fatty acids are lowest in
(A) Fish liver oil
(B) Sunflower oil
(C) Vegetable oil
(D) Coconut oil
 
107. Highest biological value is from –
(A) Eggs
(B) Milk
(C) Soyabean
(D) Meat
 
108. During pregnancy, vaccination can be given against all these diseases except –
(A) Hepatitis
(B) Typhoid
(C) Mumps
(D) Hepatitis -B
 
113. Tiger mosquitoes are
(A) Anopheles
(B) Culex
(C) Aedes
(D) Mansoides
 
122. Process of cell division can take place by
(A) Heterosis
(B) Fusion
(C) Mitosis
(D) None of these
 
140. The following element is not a constituent of fertilizer.
(A) N
(B) P
(C) S
(D) K
 
188. Essential amino acid may also be called
(A) Vitamins
(B) Hormones
(C) Steroids
(D) Enzymes
 
 

WBCS Main Question Paper – 2014

2.  In human beings, the number of chromosomes in an ordinary cell is
(A) 46     
(B) 48     
(C) 50     
(D) 52
 
10.  Islets of Langerhans are responsible for the secretion of
(A) Testosterone       
(B) Oestrogens        
(C) Insulin        
(D) Progesterone
 
16.  The blood cells that defend the body against infections are
(A) white blood cells      
(B) red blood cells       
(C) platelets      
(D) erythrocytes
 
17.  The following is an example of a marsupial
(A) Whale      
(B) Bat      
(C) Mole        
(D) Kangaroo
 
27.  A terminator gene in an organism
(A) kills the organism       
(B) switches off metabolism
(C) makes the organism sterile       
(D) terminates all protein pathways
 
28.  A magic bullet is a
(A) bullet that kills a person magically
(B) drug that selectively targets a disease without other effects
(C) guided missile
(D) high magnification microscope
 
52.  Natural source of O2 in environment is
(A) Respiration       
(B) Transpiration         
(C) Photosynthesis       
(D) Combustion
 
62.  The discovery of jumping genes is associated with the name of
(A) Sir Jagdish Chandra Bose
(B) Sir J. B. S. Haldane
(C) Dr. Barbara McClintock   (1940)
(D) M. S. Swaminathan
 
70. DNA was discovered by
(University of Cambridge in 1953)
(A) Hargovind Khorana
(B) James Watson and Francis Crick
(C) Francis Crick and Alexander Fleming
(D) James Watson and Hargovind Khorana
 

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