Biology – Science – WBCS Preliminary Question Paper

Biology Science  WBCS Preliminary Question Paper
wbcs biology questions

WBCS Preliminary Question – 2020

122. Plants receive nutrients from
(nitrogen, phosphorus, potassium)
(A) atmosphere
(B) chlorophyll
(C) soil
(D) light
141. The greenhouse gas that is a product of the contribution of fossil fuels is
(A) CO2
(B) CH4
(C) O3
(D) N2O
155. Which can bind O2 molecules?
(A) Red blood cells
(B) White blood cells
(C) Vitamin B12
(D) Vitamin E
189. Excess fluoride in drinking water causes
(A) Lung disease
(B) Intestinal Infection
(C) Fluorosis
(D) Rickets

WBCS Preliminary Question – 2019

128. The number of spinal nerves in human body are
(A) 12 pairs     
(B) 31 pairs      
(C) 31     
(D) 12
145. The food that gives more calories per unit mass of food is
(Fat – 9 cal/gram)
(A) protein     
(B) carbohydrates     
(C) fat    
(D) water
(A) rate of heart beats    
(B) potential difference    
(C) ventricular concentration    
(D) volume of blood pumped
(A) Carbon monoxide, Methane and Hydrogen
(B) Carbon dioxide, Methane and Hydrogen
(C) Carbon monoxide, Ethane and Hydrogen
(D) Carbon dioxide, Ethane and Hydrogen
149. If persons addicted to alcohol, the liver gets damaged because it
(A) has to detoxify the alcohol.
(B) stores excess of glycon.
(C) is over stimulated to secrete more bile.
(D) accumulates excess of fats.

WBCS Preliminary Question – 2018

62. Life span of red blood cells is ________days.
(a) 60
(b) 120
(c) 180
(d) 240
70. Muscle fatigue is due to accumulation of
(a) Carbon Dioxide
(b) Creatinine
(c) Lactic acid
(d) Ethyl alcohol
84. The number of milk teeth in man is
(a) 28
(b) 29
(c) 20
(d) 12
94. Amounts of O2 normally carried by 100 ml of pure human blood, is
(a) 40 ml
(b) 10 ml
(c) 20 ml
(d) 30 ml
99. Which one of the following organs is the main respiratory organ of whale?
(a) Integuments
(b) Gills
(c) Lungs
(d) Trachea
149. Deficiency of Vitamin-D results in
(a) night blindness
(b) rickets
(c) scurvy
(d) hair fall

WBCS Preliminary Question – 2017

26.  Nekton are   
(A) floating organisms in water
(B) swimming organisms in water
(C) animals associated with aquatic plants
(D) sub-merged plants in water
28. Barr body is absent in somatic cell of
(A) Klinefelter syndrome individual
(B) Tripple X syndrome individual 
(C) Turner syndrome individual 
(D) Sub-human mammalian female individual
29. A mamal that lays eggs  
(A) Talpa   
(B) Echinda
(C) Pteropus   
(D) Lemur  
30.  Which one of the following animal phylum is latest by discovery? 
(1983 by Reinhardt Kristensen)
(A) Pogonophora   
(B) Kinnorhyncha   
(C) Loricifera
(D) Ctenophora  
34.  An example of modified underground stem is   
(A) Carrot   
(B) Potato    
(C) Groundnut   
(D) Turnip  
35.  Crossing over occurs during meiosis at   
(A) Leptotene   
(B) Anaphase -I   
(C) Pachytene
(D) Diakinesis   
36.  Particulate theory of inheritance” was proposed by   
(A) Charles Darwin   
(B) Gregor Johann Mendel
(C) Herman Muller   
(D) T. H. Morgan   
37.  What is a bacteriophage   
(A) A virus
(B) A bacterium growing in artificial nutrient medium   
(C) A fungus causing disease   
(D) A phagocytic protozoa   
38.  The nature of stele in primitive vascular plants was   
(A) Protostele
(B) Siphonostele   
(C) Dictyostele   
(D) Atactostele 
39. Which of the following processes makes direct use of oxygen?   
(A) Glycolysis   
(B) Fermentation   
(C) Citric Acid Cycle   
(D) Electron transport
40. The well-known antibiotic penicillin is obtained from this plant group:   
(1929, Alexander Fleming)
(A) Algae   
(B) Fungi   
(C) Lichen   
(D) Angiosperm 
178.  In the wake of the Stockholm Conference, the Government of India set up the National committee on Environmental Planning and Coordination in the year   
(Pitamber Committee)     
(A) 1972
(B) 1980        
(C) 1985        
(D) 1990       

WBCS Preliminary Question – 2016

122.  A pure red flower bearing plant is crossed with a pure white flower and the F1 plant bears pink flowers. This is an example of :
(1860s, Gregor Johann Mendel)
(A) Pseudo dominance      
(B) Dominance       
(C) Epistasis     
(D) Co-dominance
125.   A short day plant has a critical day length of 14 hours. It will flower when the day length is :
(A) 15 hours        
(B) 18 hours        
(C) 12 hours       
(D) 16 hours
129.   An endobiotic fungus is :
(A) Agaricus       
(B) Morchella         
(C) Synchytrium        
(D) Polyporus
132.  Gynobasic style is present in which family ?
(A) Mawaceae        
(B) Solanaceae         
(C) Labiatae        
(D) Orchidaceae
135.  ‘Globule’ and ‘Nucule’ is found in :
(charophyte green algae)
(A) Oedogonium      
(B) Rhizopus       
(C) Calamites        
(D) Chara
139. Spindle fibres are made up of :
(A) Flagellin        
(B) Tubulin       
(C) Cellulose        
(D) Chitin
143. A carcinoma is a cancer originating from :
(A) Epithelial tissue      
(B) Connective tissue      
(C) Muscular tissue      
(D) Nerve tissue
147. A muscle that is consciously controlled :
(Skeletal muscle)
(A) Striated voluntary       
(B) Striated involuntary
(C) Non-striated voluntary      
(D) Non-striated involuntary
177.  Grub is the larva of 
(A) Insects       
(B) Crustacea        
(C) Beetle      
(D) Sponges
180.   According to the competitive exclusion principle, two species cannot continue to occupy the same :
(Gause’s law)
(A) Biome       
(B) Habitat        
(C) Territory       
(D) Niche
(A) Red Blood Cell       
(B) Kidney tissues       
(C) Small intestinal tissues        
(D) None of the above

WBCS Preliminary Question – 2015

122.  Transfer of pollen from another to the stigma of the same flower is referred to as :
(A) Allogamy      
(B) Geitenogamy      
(C) Xenogamy       
(D) Autogamy
125.  The Pyrimidine bases in a DNA are :
(A) Adenine and Guanine      
(B) Thymine and Adenine
(C) Cytosine and Guanine      
(D) Thymine and Cytosine
129.  Which one of the following is the natural auxin ?
(Indole-3-acetic acid)
(A) NAA         
(B) IAA       
(C) 2, 4-D     
132. During cell division, DNA synthesis takes place in
(A) Interphase      
(B) Anaphase       
(C) Prophase     
(D) Telophase
135.  In monohybrid cross of Mendel, when a pure tall plant was crossed with a dwarf plant, all the F1 progeny were tall, because of:
(A) Co-dominance       
(B) Dominance      
(C) Incomplete dominance      
(D) Epistasis
143.  Cerebral Malaria is caused by
(A) Plasmodium vivax     
(B) Plasmodium malariae      
(C) Plasmodium falciparum     
(D) None of the above
147.  “Natural Selection” is the theory from
(A) G. J. Mendel       
(B) Charles Darwin      
(C) T. H. Morgan      
(D) None of the above
161.  Coal, Petroleum and Natural Gas are examples of
(A) Fossil Fuels       
(B) Cryogenic Fuels      
(C) Indigenous Fuels      
(D) Radioactive Fuels
177.  ‘Tasar’ silk fiber is produced by
(A) Antheraea mylitta       
(B) Bombyx mori   
(C) Philosomia ricini      
(D) Antheraea assamensis
180.  One turn of DNA helix measures
(A) 34A°      
(B) 3.4A°      
(C) 24A°      
(D) 44A°
183.  Phenotypic ratio of Mendelian Dihybrid cross is
(A) 9 : 3 : 3 : 1      
(B) 1 : 1 : 1 : 1      
(C) 3 : 4 : 3 : 1     
(D) 1 : 2 : 1 : 1
186.  Cranial nerve in mammals are
(A) 10 pairs      
(B) 10       
(C) 12 pairs      
(D) 12

WBCS Preliminary Question – 2014

35.  The stage of mitosis in which chromosomes become V, J, L or I shaped ?
(A) Prophase      
(B) Metaphase       
(C) Anaphase      
(D) Telophase
38.  The digested food is absorbed in
(A) Stomach       
(B) Intestine (small)      
(C) Intestine (large)      
(D) Colon
42.  Rhizome is a modified stem because
(A) it grows vertically upward in the soil and it has fleshy leaves.
(B) it has nodes and it has eyes which bears germinating buds.
(C) its stem is highly condensed and disc like.
(D) it has nodes, internodes and has brown, scaly leaves.
47.  The longest cell in animals is
(A) Nerve cell      
(B) Hepatocyte (Liver cell)       
(C) Blood cell      
(D) Muscle cell
55.  The identifying features of carrot roots are
(A) Conical with small roots.       
(B) Conical without small roots.
(C) Round with small roots.        
(D) Irregular with no small roots.
179.  Which one of the following is a protein deficiency disease ?
(edematous malnutrition)
(A) Pellagra      
(B) Ricket       
(C) Kwashiorkor      
(D) Retinoblastoma
183.  Which disease is caused by fungus ?
(A) Polio      
(B) Malaria        
(C) Dermatitis   
(D) Cholera
188.  Clove is obtained from
(A) Root      
(B) Stem       
(C) Leaf       
(D) Flower bud
192.  Which one of the following is not a true fruit ?
(A) Date       
(B) Plum        
(C) Apple       
(D) Grape
195.  AIDS is caused by
(human immunodeficiency virus)
(A) Bacteria       
(B) Virus      
(C) Protozoa      
(D) Helminth
200.  Monocotyledonous plants show which of the following feature ?
(grass-like flowering plants)
(A) Leaf shows reticulate venation       
(B) Tap root system
(C) Flowers are trimerous       
(D) Perennial growth

WBCS Preliminary Question – 2013

80.  In angiosperm, triple fusion is required for the formation of —
(sexual reproduction)
(A) Embryo       
(B) Endosperm      
(C) Suspensor      
(D) Pericarp
97. Oil is obtained from the endosperm of —
(A) Groundnut       
(B) Coconut       
(C) Mustard      
(D) Sesame
100.  The number of cervical vertebrae in mammal is —
(vertebrae of neck)
(A) Seven      
(B) Seventeen      
(C) Seventy seven      
(D) Eleven
104.  Limbless Amphibians belong to the order —
(A) Urodela       
(B) Anura       
(C) Gymnophiona      
(D) None of the above
109.  Birds differ from bats in the absence of
(A) Warm blood      
(B) Four chambered heart     
(C) Trachea       
(D) Diaphragm
115.  Portion of the carapace which covers the gill of prawn is known as —
(Respiratory System)
(A) Bronchus      
(B) Branchiostegal membrane       
(C) Branchiostegite      
(D) Branchiostegal spine
119.  Which one of the following is a rich source of amylase ?
(enzyme – starch into sugar)
(A) Brain       
(B) Blood      
(C) Thyroid       
(D) Pancreas

WBCS Preliminary Question – 2012

31.  Adult Filaria worms live in human 
(A) Blood       
(B) Lymphatics      
(C) Liver       
(D) Intestine
35. The disease caused due to lack of ADH   
(Antidiuretic Hormone)
(A) Diabetes insipidus       
(B) Diabetes mellitus     
(C) Grave’s disease      
(D) Cushing’s disease
38.  The animal group that is not found in marine water
(no true marine amphibians)
(A) Mammals      
(B) Amphibian       
(C) Reptiles        
(D) Aves
42.  Normal human blood is
(pH range 7.35 to 7.45)
(A) Acidic         
(B) Alkaline       
(C) Neutral      
(D) Variable
47.  The non-poisonous snake is :
(A) Viper      
(B) Krait        
(C) Python       
(D) Coral Snake
55.  Which one of the following is a viral disease ?
(A) Trypanosomiasis     
(B) Giardiasis      
(C) Encephalitis      
(D) Oriental sore
179.  Xylem tissue is mainly concerned with the –
(Carl Nageli in 1858)
(A) Photosynthesis of plants         
(B) Transport of water and mineral nutrients in plants
(C) Storage of prepared food in plants       
(D) Transport of enzymes in plants
183.  The ‘Theory of Natural Selection’ was proposed by
(A) J. B. S Haldane      
(B) G. J. Mendel       
(C) A. I. Oparin       
(D) C. R Darwin
192. The enzyme ‘DNA gyrase’ is associated with the function of 
(ATP-dependent type II topoisomerase)
(A) Protein syntheses     
(B) DNA replication      
(C) Lipid biosynthesis     
(D) DNA damage
195.  The plant body is not ‘differentiated into root, stem and leaves’ in
(A) Pteridophytes       
(B) Angiosperms       
(C) Gymnosperms       
(D) Algae
200.   The total mass of all the organisms of a given type and/or in a given area is called
(species biomass)
(A) Biome       
(B) Biomass      
(C) Biomarer     
(D) Biosensor

WBCS Preliminary Question – 2011

82.  Which one of the following is an endemic plant ? 
(Gulf Coastal Plain, USA)
(A) Quercus Incana     (Oak Tree)
(B) Eleusine Coracana  (finger millet)   
(C) Phoenix Paludosa      
(D) Kydia Calycina
92.  Name one rootless plant 
(aquatic flower)
(A) Ceratophyllum        
(B) Eichhornia      
(C) Monochoria      
(D) Pistia
94.  Watson and Crick are famous for their discovery of
(1953, Nature magazine)
(A) Life history of Plasmodium Vivax    
(B) Vaccinia       
(C) Structure of DNA      
(D) Antibodies
100.  Nerve cells originate from the embryonic
(A) Ectoderm  
(B) Endoderm        
(C) Mesoderm      
(D) Both endo and mesoderm
101.  The number of amino acids occurring in nature is
(1935, William Cumming Rose)
(A) 10      
(B) 20       
(C) 30      
(D) 40
102.  Which of the following is an unlatching group  ?
(A) Cray fish, cuttle fish and hag fish      
(B) Star fish, sea urchin and sea cucumber
(C) Cockroach, crab and spider      
(D) Whale, lizard and frog
118.  The smallest size of a cell which can be seen with unaided eye is
(100 micrometre = 0.1 mm)
(A) 1 micron      
(B) 10 microns        
(C) 100 microns       
(D) 1000 microns
121.  The gastric glands in the stomach produce an enzyme
(Proteins to peptides)
(A) Insulin      
(B) Ptyalin        
(C) Pepsin      
(D) Trypsin
123.  Which of the following is a terrestrial algae  ?
(chlorophyte green algae)
(A) Chlorella       
(B) Trentepohlia       
(C) Spirullina       
(D) Sargassum
170.  Kranz anatomy states that, plant has
(A) C3 cycle        
(B) C4 cycle      
(C) C2 cycle      
(D) Both C3 and C4 cycle
190.  Essential constituent of plant cell is the carbohydrate
(polymeric glucose – (C6H10O5)n)
(A) Cellulose     
(B) Sucrose       
(C) Starch     
(D) Lignin

WBCS Preliminary Question – 2010

29.  The gene for Haemophilia is
(A) X-linked recessive 
(B) X-linked dominant      
(C) Y-linked       
(D) Located in autosome
30.  The narrow portion between uterus and vagina of higher mammals is known as
(A) Clitoris      
(B) Urethra       
(C) Oviduct       
(D) Cervix
31.  The toxic chemical element that caused Minamata disease in Japan was
(neurological disease)
(A) Uranium         
(B) Mercury       
(C) Cadmium       
(D) Arsenic
32.  The vegetative body of a dryophyte/moss represents the structure of
(A) Sporophyte   
(B) Gametophyte   
(C) Sporophyte or gametophyte   
(D) Sporophyte and gametophyte
36.  Enzymes speed up biochemical reactions by
(A) Increasing the activation energy of the reaction
(B) Lowering the temperature of the reaction
(C) Increasing the temperature of the reaction
(D) Lowering the activation energy of the reaction
37.  Cardiac muscles do not undergo fatigue, because
(A) Interconnection of cells by intercalated disc       
(B) Having numerous mitochondria
(C) Having more actins       
(D) Having more myosin
39.  In photosynthesis, ‘Light reaction’ takes place in
(A) Cytosol       
(B) Grana of Chloroplast      
(C) Stroma of chloroplast       
(D) Ribosome
41.  Haversian system is a part of
(Haversian canals)
(A) Kidney       
(B) Bone       
(C) Heart      
(D) Brain
45.  Polytene chromosome is found in the cells of
(Dipteran Flies)
(A) Salivary gland of larvae of flies      
(B) Liver of man      
(C) Neuron of insects    
(D) None of the above
46.  Presence of sunken stomata in leaves indicates the character of
(hidden stomata, hot desert plant)
(A) Hydrophytes       
(B) Xerophytes       
(C) Halophytes      
(D) Mesophytes
51.  Which Carbohydrate is used commercially in the silvering of mirrors ?
(A) Sucrose      
(B) Fructose       
(C) Cellulose      
(D) Glucose   (C₆H₁₂O₆)
53.  Which metal ion is responsible for electron transportation in photosynthesis ?
(A) Sodium        
(B) Potassium         
(C) Cobalt       
(D) Iron
57.  The technique of ‘DNA sequencing’ was discovered by 
(A) H. G. Khorana       
(B) Watson and Crick      
(C) Frederick Sanger     
(D) E. M. Southern
59.  A Cladogram depicts the hypothesis of
(A) Evolutionary relationship      
(B) Phenatic relationship
(C)  Genetic relationship          
(D)  Taxonomic relationship
124.  AIDS/HIV virus is a type of
(RNA converted into DNA)
(A) DNA virus        
(B) RNA virus      
(C) Either DNA or RNA virus     
(D) Both DNA and RNA virus

WBCS Preliminary Question – 2009

58.  How much percent of human body is water by weight ? 
(actually 60%)
(A) 66      
(B) 50 
(C) 33      
(D) 10
62.  Iodine is administered to patients suffering from
(A) Goitre       
(B) Night blindness      
(C) Ricket      
(D) Rheumatism
72.  Vitamin C is
(A) Tocopherol    
(B) Cyanocobalamin  
(C) Ascorbic acid     
(D) Thiamine
75.  Greenhouse effect is caused by addition of too much of this compound in atmosphere.
(A) Carbon di-oxide     
(B) Ammonia     
(C) Water vapour    
(D) Dust particles
80.  Edible portion of coconut is the
(A) Fruit wall      
(B) Endosperm     
(C) Cotyledon      
(D) Embryo
84.  From which part of Cinchona plant quinine is obtained ?
(A) Seed  
(B) Leaf  
(C) Flower
(D) Bark
97.  During Vietnam War 2, 4, 5-trichlorophenoxy-acetic acid (2, 4, 5-T), the so-called Agent Orange was sprayed on forests to 
(synthetic auxin)
(A) Destroy Crops 
(B) Pollute Air 
(C) Remove leaves and reveal enemy hiding places 
(D) Start forest fire
100.  Malaria Parasite can best be obtained from blood of its patient
(A) One hour before rise of temperature      
(B) Five hours after temperature
(C) When temperature rise with rigor         
(D) Any time
104.  Which of the following vitamins forms the prosthetic group of acyl-COA dehydrogenase ?
(A) Nicotinic acid      
(B) Pyridoxine       
(C) Pantothenic acid       
(D) Riboflavin
109.  Name the excretory organ of prawn
(A) Salivary gland       
(B) Green gland      
(C) Ink gland     
(D) Malpighian tubule
112.  Ruminant Stomach is possessed by
(A) Cow
(B) Dog       
(C) Pigeon      
(D) Cameleon
119.  From Antheraea assamensis the type of silk obtained is
(A) Tasar      
(B) Munga      
(C) Eri     
(D) Mulberry silk

WBCS Preliminary Question – 2008

102. Amount of blood pumped by an adult heart per hour is about
(A) 150 litre   
(B) 200 litre 
(C) 300 litre   
(D) 340 litre 
103. A bacterium differs from virus with respect to
(A) DNA   
(C) Both RNA and DNA
(D) None of the above
108. A father feeds his baby, he smiles and babbles encouragingly. The father’s babbling could be considered
(A) Primary reinforcement
(B) Secondary reinforcement
(C) Classical conditioning
(D) Contiguity learning 
112. The instrument used for measuring blood pressure is called
(A) Barometer
(B) Sphygmomanometer
(C) Tonometer
(D) None of the above 
113. The behaviour of energy in ecosystem can be conveniently termed as energy flow because
(A) Energy transformations are multi-directional in nature
(B) Energy is the denominator of all kinds of system
(C) Energy transformations are one way indirection
(D) None of the above
118. Complete loss of memory is termed
(A) Trauma   
(B) Amnesia
(C) Coma   
(D) Paramnesia
122. The ingredient that assists clotting of blood is
(A) Vitamin A        
(B) Folic acid        
(C) Vitamin D     
(D) Vitamin K 
123. The causative organism of malignant malaria in human being is
(A) Plasmodium vivax 
(B) Plasmodium falciparum
(C) Plasmodium malarie 
(D) Plasmodium ovale 
132. The nitrogen base absent in DNA
(A) Uracil   
(B) Adenine 
(C) Thymine   
(D) Cytosine
137. Stimulating the occipital area of the brain produces sensation of 
(A) Vision  
(B) Taste 
(C) Motion  
(D) Touch 
142. Ribosomes play a significant role in
(A) Photosynthesis 
(B) Protein synthesis
(C) Lipid synthesis
(D) Respiration
143. The Greenhouse effect gases trap only the heat of following radiations:
(A) Ultraviolet       
(B) Infrared       
(C) Solar
(D) Both (A) and (B)
147. To study the development of a child at different ages, the most appropriate method of investigation is
(A) Longitudinal
(B) Correlational
(C) Naturalistic
(D) Cross-sectional
152. Name of a insectivorous plant
(A) Gulancha  
(B) Nayantara        
(C) Basak   
(D) Pitcher Plant
154. Which of the following is not a stimulant ?
(A) Caffeine     
(B) Barbiturates    (depressant)
(C) Cocaine     
(D) Amphetamines 
162. Cancer is caused by activation of genes
(A) Regulatory genes
(B) Oncogenes
(C) Structural genes
(D) Jumping genes 
164. Parkinson’s disease is characterised by the loss of nerve cells in the 
(A) Cingulate cortex
(B) Substantia nigra
(C) Reticular formation
(D) Cerebral cortex  
167. Most patients hospitalised for mental disorders suffer from
(A) Neurosis
(B) Depression
(C) Hysteria
(D) Schizophrenia
172. Flowers without petals are pollinated by
(A) Bees   
(B) Birds 
(C) Butterflies  
(D) Wind
174. As we age, the cognitive ability that declines most is the ability to 
(A) Recall new information 
(B) Remember small details 
(C) Learn new information  
(D) Use new information 
176. Predisposing cause of a disease are referred to as
(A) Ethnology  
(B) Ecology
(C) Etiology   
(D) Environmental factors 
181. The biochemical processes taking place in the body is known as 
(A) Anabolism 
(B) Catabolism
(C) Metabolism     
(D) None of the above 
182. RNA of retrovirus can produce DNA by
(A) DNA polymerase
(B) RNA polymerase
(C) Endonuclease 
(D) Reverse transcriptase
184. Following pairs that is incorrectly matched is
(John Bowlby’s attachment theory)
(A) Beck-cognitive therapy
(B) Adler-individual therapy
(C) Freud-psychoanalysis
(D) Bowlby-behaviour therapy 
192. The intermediate host of Leishmania donovani is
(kala-azar parasites)
(A) Sand fly
(B) Tse-tse fly
(C) Dragon fly
(D) Anopheles mosquito 
194. The WISC-R test is
(A) An individual test for adults
(B) An individual test for children
(C) A group test for children
(D) A group test for adults
196. Of the patients with the following diagnosis, which is most likely to voluntarily commence psychotherapy?
(A) The patient with depressive reaction
(B) The patient with anxiety disorder
(C) The patient with phobia
(D) The patient with personality disorder 
197. Gardner’s theory of intelligence does not recognize which of the following types of intelligence? 
(A) Social skills 
(B) Language skills
(C) Musical skills 
(D) G-factor 

WBCS Preliminary Question – 2007

27. The Phyto-hormone responsible for senescence
(A) Cytokinin        
(B) Auxin    
(C) Gibberellin  
(D) Ethylene
40. Which one of the following is not a hereditary disease in man?
(A) Hemophilia
(B) Color blindness
(C) Alzheimer’s disease 
(D) Down’s syndrome
60.  Ecological niche is the
(A) Biotic component in an ecosystem
(B) Abiotic component in an ecosystem
(C) both (A) and (B) above
(D) None of the above 
(A) Infective particle of virus     
(B) Infective particle of bacteriophage
(C) Infective stage of virus       
(D) None of the above 
86. Which one of the four following substances contribute most of the causation of greenhouse effect in nature ?
(A) Carbon di-oxide  
(B) Hydrogen fluoride
(C) Carbon monoxide 
(D) Sulphur di-oxide 
87. A peduncle is a
(A) Stalk of flower  
(B) Stalk of a leaf
(C) Stalk of a fruit       
(D) None of the above
95. The Kala-azar disease in man is spread by the bite of a
(A) Culex mosquito   
(B) Phlebotomus sand-fly
(C) Climex bed-bug  
(D) Sarcoptes mite 
119. The genetic make-up of a normal human male consists of 
(A) XY Chromosomes 
(B) XO Chromosomes
(C) XX Chromosomes 
(D) XXO Chromosomes 
132. Which one of the following is a polymorphic species?
(A) Garden lizard  
(B) Spider   
(C) Gorilla   
(D) Ant 
138. All food tins in nature begin at the producer level and all end at the decompose level. Which of die following is be producer in a pond ecosystem? 
(A) Phytoplankton     
(B) Zooplankton   
(C) Herbivores     
(D) Carnivores 
139. A plant virus causing disease of the vegetables:
(A) Tobacco Mosaic virus 
(B) Cauliflower Mosaic virus
(C) Adenovirus  
(D) None of the above
145. Chemically Sporopollenin is a 
(A) Co-polymer of carotenoids & fatty acid 
(B) Carbohydrate 
(C) Protein 
(D) Lactic acid 

WBCS Preliminary Question – 2006

29. In plants, the receptor for detecting photoperiodism is
(a) Sensory cell 
(b) Sensory organelles
(c) Protein molecule
(d) Gradient of K 
30. Urea is produced in the body of man in
(a) Liver   
(b) Urinary Bladder 
(c) Kidney   
(d) Hemoglobin
36. Fruit fall can be prevented by spraying
(Indole-3-acetic acid)
(a) IAA       
(b) Abscisic acid 
(c) Cytokinins  
(d) NAA 
37. Restriction enzymes are synthesized by
(a) All eukaryotic cells
(b) Yeast and bacteria only
(c) Bacteria only 
(d) All cells 
40. Primary and Secondary growth are inhibited by
(a) Auxin    
(b) Gibberelins 
(c) Abscisic acid   
(d) Cytokinins 
72. From a cross between a pure strain of plants with yellow peas and pure strain of plants with green peas, how many different eggs are produced by F1 offspring’s?
(a) 1     
(b) 2 
(c) 4     
(d) 8 
112. Connecting link between reptiles and birds is
(a) Archaeopteryx
(b) Platypus 
(c) Java Apeman   
(d) Whale 
119. Which of the following is not a kidney function?
(a) Ultra filtration 
(b) Tubular Reabsorption
(c) Tubular Secretion
(d) Phagocytosis 
(a) Racemose   
(b) Hvpanthodium 
(c) Cyathium   
(d) Spadix 
187. Loop of Henle lies in the
(a) Cortex    
(b) Medulla
(c) Renal Pelvis   
(d) Ureter 
190. A viral disease is
(a) Cancer    
(b) Leukemia 
(c) Typhoid    
(d) Yellow Fever 
195. Which one is not a protozoa?
(a) Hydra    
(b) Euglena
(c) Amoeba    
(d) Paramaecium 

WBCS Preliminary Question – 2005

39. According to Darwin the unit of Natural Selection is 
(a) Individual
(b) Family 
(c) Genus
(d) Species
44.Which one of the following plants keep its stomata open during night and closed during the day?
(a) Water Lily
(b) Cactus 
(c) Sun flower
(d) Fern 
49.The main function of norepinephrine is to
(a) increase blood pressure 
(b) increase urine formation 
(c) increase cellular respiration 
(d) release epinephrine 
63.Which one of the following plant tissues is composed of dead cells?
(a) Xylem
(b) Phloem 
(c) Parenchyma
(d) Hypodermis 
94.Which one of the following blood-group bearing persons is called a universal donor?
(a) A
(b) B  
(c) AB
(d) O 
96.The largest reservoir of Nitrogen on Earth is
(a) Soil
(b) Air 
(c) Ocean
(d) Rock 
104.According to cellular structure which one of the following is most complex? 
(a) Bacteria 
(b) Protozoa 
(c) Algae 
(d) Fungi 
105.Plants store glucose in the form of      
(a) Monosaccharide
(b) Cellulose 
(c) Starch        
(d) Glycogen 
107.The amount of blood in the blood circulatory system of a man is
(7% of body weight)
(a) one litre       
(b) two litres 
(c) five litres       
(d) ten litres
114.Of the twenty amino acids how many are considered essential? 
(a) Six    
(b) Nine 
(c) Twelve   
(d) Fourteen 
135. Cholesterol is a/an                                      
(a) Saturated fat
(b) Unsaturated fat 
(c) Steroid        
(d) Diglyceride 
136.Which one of the following animals possess least number of body segments?
(a) Flat worm    
(b) Earth worm 
(c) Prawn  
(d) Cockroach 
137.Sweat, saliva and tear contain an enzyme called Lysozyme. It kills  
(a) Virus infected cells
(b) Protozoa 
(c) Bacteria
(d) Virus 
162. Antibodies are synthesized by                       
(a) Bone marrow  
(b) Plasma and Lymph 
(c) Liver    
(d) Kidney  
167.The first hormone produced by Genetic Engineering is 
(a) Estrogen
(b) Testosterone 
(c) Thyroxin
(d) Insulin
196.The scientific name of Vitamin ‘C’ is             
(a) Acetic acid        
(b) Muriatic acid 
(c) Ascorbic acid
(d) Lactic acid 

WBCS Preliminary Question – 2003

36. Pitcher plant is
(A) Autotrophic    
(B) Heterotrophic
(C) Insectivorous  
(D) Actinomorphic 
46. AIDS is
(A) Viral disease  
(B) Fungal disease
(C) Bacterial disease  
(D) Genetically disease 
56. Universal donor in blood transfusion refers to
(A) Blood Group A  
(B) Blood Group B
(C) Blood Group AB 
(D) Blood Group O 
66. Scurvy is caused by the deficiency of
(A) Vit. A   
(B) Vit. B 
(C) Vit. C   
(D) Vit. D 
76. Which of the following becomes zero in a fully turgid cell?
(A) Water potential  
(B) Wall pressure
(C) Osmotic pressure 
(D) All of the above 
86. Colles’ fracture is associated with
(A) Humerus         
(B) Radius       
(C) Ulna          
(D) Femur 
96. Septicemia is
(A) Food poisoning  
(B) Blood poisoning
(C) Mental disorder  
(D) None of the above 
106. Malaria is caused by
(A) Plasmodium  
(B) Anopheles mosquito
(C) Cuiex mosquito  
(D) Bad air 
136. The following animal has the similar vision as we have
(A) Crow   
(B) Owl 
(C) Horse   
(D) Pigeon
156. The genetic information are carried by
(A) Protein   
(B) Fatty acids
(C) Nuclear acids  
(D) Carbohydrate 
186. Which of the following is the hardest substance in the human body?
(A) Bone    
(B) Enamel      
(C) Dentine         
(D) Nail 
196. The following animal is called friend of farmer:
(A) Cow      
(B) Earthworm  
(C) Rhizobium        
(D) Honey-bee  

WBCS Preliminary Question – 2002

25. During photosynthesis,
(A)  Presence of oxygen is essential 
(B)  Catabolic reaction takes place 
(C)  Light energy is stored as potential chemical energy in the food (glucose) 
(D)  Stored potential chemical energy of food is released as heat energy and other forms of energy. 
41. Which one is the connecting link between Reptiles and Mammals?
(A) Peripatus   
(B) Lung fish
(C) Duckbill platypus 
(D) Archaeoptaryx (Extinct) 
72. Fixation of nitrogen is meant
(A) Liquefaction of nitrogen 
(B) Conversion of atmospheric nitrogen into useful compound 
(C) Manufacture of nitrogen from air 
(D) Conversion of nitrogen into nitric acid
82. Which one of the following is not an endocrine gland?
(A) Adrenal gland (cortex) 
(B) Pituitary gland 
(C) Salivary gland   
(D) Thyroid gland 
104. Normal leaves are called
(A) Seed leaves      
(B) Flora leaves    
(C) Foliage leaves   
(D) Scale leaves  
142. Roots of a tree are
(A) Negatively geotropic  
(B) Positively geotropic 
(C) Positively phototropic  
(D) Negatively hydrotropic. 
146. Majority of animal-viruses contain
(B) RNA 
(C) RNA and DNA   
(D) None of DNA
147. In which part of human body, urea is produced?
(A) Kidneys      
(B) Liver     
(C) Pancreas        
(D) Urinary bladder 
159. Which of the following vitamin is most easily destroyed by heat and air?
(A) A    
(B) B 
(C) C    
(D) D 
163. Refrigeration helps in food preservation by
(A) Killing bacteria and germs 
(B) Greatly retarding the rates of biochemical reaction 
(C) Providing a cover of ice over food 
(D) Stopping enzyme action
173. Which of the following is an infectious bacterial disease?
(A) Conjunctivitis   
(B) Diphtheria    
(C) Influenza      
(D) Measles 

WBCS Preliminary Question – 2001

42. The image of an object formed on the retina of the eye is
(A) Virtual and erect 
(B) real and erect
(C) Virtual and inverted 
(D) real and inverted  
66. Chlorine is not a constituent of
(A) DDT   
(B) chlorophyll
(C) chloroform  
(D) bleaching powder 
71. Lysine is an essential amino acid because
(A) it is very rare
(B) it is an important constituent of all proteins
(C) it has a high nutritive value
(D) it is not formed in the body and has to be provided through food 
90. _____ is an antivitamin.
(A) beta carotene  
(B) methylcobalamin
(C) pyrithiamine  
(D) folic acid 
101. Which part of ear maintain the balance of our body?
(A) otolith   
(B) malleus
(C) tympanic membrane 
(D) cochlea
161. Which one of the following is a protozoa?
(A) Pea mosaic  
(B) Entamoeba histolytica
(C) Yeast   
(D) Yariola 
162. The disease caused by the deficiency of vitamin B12
(A) aplastic anaemia  
(B) sickle cell anaemia 
(C) normocytic anaemia 
(D) pernicious anaemia 

WBCS Preliminary Question – 2000

25. The closest distance at which a normal person can see an object clearly is
(A)  10 cm.    
(B)  50 cm. 
(C)  80 cm.    
(D)  25 cm. 
37. Which one of the following in not an autotrophy?  
(primary producer)
(A)  Grass    
(B)  Green Algae 
(C)  Fungus    
(D)  Fern 
38. Photosynthetic plants store glucose as
(A)  Sucrose    
(B)  Starch 
(C)  Cellulose   
(D)  Glycogen 
40. In the present concept of evolution the unit of evolution is 
(A)  Individual   
(B)  Families 
(C)  Population   
(D)  Species 
41. Which one of the following is a Reptile?
(A)  Salamander   
(B)  Turtle 
(C)  Newt    
(D)  Shark 
42. Yellowing of plant leaves is called chlorosis, Insufficiency of which ion causes it?
(A)  Sodium    
(B)  Phosphorus 
(C)  Calcium    
(D)  Magnesium 
43. A red blood cell lives for about
(A)  One week   
(B)  One month 
(C)  Four months   
(D)  One year 
44. The percentage of solar energy absorbed by the leaves of green plant in photosynthesis is
(A)  1    
(B)  10
(C)  30    
(D)  50

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