Biology

WBCS Prelims – 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. Amiunts 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) hairfall
 
 
 
WBCS Prelims – 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   
Talpa   
Echinda
Pteropus   
Lemur  
 
30.  Which one of the following animal phylum is latest by discovery?   
Pogonophora   
Kinnorhyncha   
Loricifera
Ctenophora  
 
34    An example of modified underground stem is   
Carrot   
Potato    
Groundnut   
Turnip  
 
35.  Crossing over occurs during meiosis at   
Leptotene   
Anaphase -I   
Pachytene
Diakinesis   
 
36.  “Particulate theory of inheritance” was proposed by   
Charles Darwin   
Gregor Johann Mendel
Herman Muller   
T. H. Morgan   
 
37.  What is a bacterio-phage   
A virus
A bacterium growing in artificial nutrient medium   
A fungus causing disease   
A phagocytic protozoa   
 
38    The nature of stele in primitive vascular plants was   
Protostele
Siphonostele   
Dictyostele   
Atactostele 
 
39. Which of the following processes makes direct use of oxygen?   
Glycolysis   
Fermentation   
Citric Acid Cycle   
Electron transport
 
40    The well-known antibiotic penicillin is obtained from this plant group:   
Algae   
Fungi   
Lichen   
Angiosperm 
 
 
WBCS Prelims – 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 :
(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 :
(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 :
(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 :
(A) Biome       
(B) Habitat        
(C) Territory       
(D) Niche
 
186.  Target tissue of insulin is :
(A) Red Blood Cell       
(B) Kidney tissues       
(C) Small intestinal tissues        
(D) None of the above
 
 
WBCS Prelims – 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 ?
(A) NAA         (B) IAA       
(C) 2, 4-D      (D) IBA
 
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 fibre 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 Prelims – 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 stern 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 ?
(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
(A) Bacteria       
(B) Virus      
(C) Protozoa      
(D) Helminth
 
200.  Monocotyledonous plants show which of the following feature ?
(A) Leaf shows reticulate venation       
(B) Tap root system
(C) Flowers are trimerous       
(D) Perennial growth
 
 
WBCS Prelims – 2013
80.  In angiosperm, triple fusion is required for the formation of —
(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 —
(A) Seven      
(B) Seventeen      
(C) Seventy seven      
(D) Eleven
 
104.  Limbless Amphibia belongs to the order —
(A) Urodela       
(B) Anura       
(C) Gymnophiona      
(D) None of the above
 
109.  Birds differ from bat 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 —
(A) Bronchus      
(B) Branchiostegal membrane       
(C) Branchiostegite      
(D) Branchiostegal spine
 
119.  Which one of the following is a rich source of amylase ?
(A) Brain       
(B) Blood      
(C) Thyroid       
(D) Pancreas
 
 
WBCS Prelims – 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
(A) Mammals      
(B) Amphibia      
(C) Reptiles        
(D) Aves
 
42.  Normal human blood is
(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 –
(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 –
(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
(A) Biome       
(B) Biomass      
(C) Biomarer     
(D) Biosensor
 
 
 
WBCS Prelims – 2011
82.  Which one of the following is an endemic plant ?
(A) Quercus Incana      
(B) Eleusine Coracana      
(C) Phoenix Paludosa      
(D) Kydia Calycina
 
92.  Name one rootless plant.
(A) Ceratophyllum        
(B) Eichhornia      
(C) Monochoria      
(D) Pistia
 
94.  Watson and Crick are famous for their discovery of
(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
(A) 10       (B) 20   (actually 22)   
(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
(A) 1 micron      
(B) 10 microns        
(C) 100 microns       
(D) 1000 microns
 
121.  The gastric glands in the stomach produce an enzyme
(A) Insulin      
(B) Ptyalin        
(C) Pepsin      
(D) Trypsin
 
123.  Which of the following is a terrestrial 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,
(A) Cellulose     
(B) Sucrose       
(C) Starch     
(D) Lignin
 
 
 
WBCS Prelims – 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
(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
(A) Kidney       
(B) Bone       
(C) Heart      
(D) Brain
 
45.  Polytene chromosome is found in the cells of
(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
(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
 
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
(A) DNA virus        
(B) RNA virus      
(C) Either DNA or RNA virus     
(D) Both DNA and RNA virus
 
 
 
 
WBCS Prelims – 2009
54.  Normal saline is an aquous solution of sodium chloride of strength
(A) 0.84 % (0.9%)         
(B) 1.00 normal       
(C) 1.00 molar    
(D) 1 %
 
58.  How much per cent 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) Cyanocobaltammine       
(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
(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 dehydrogenage ?
(A) Nicotinic acid      
(B) Pyridoxine       
(C) Pantothenic acid       
(D) Riboflavin
 
109.  Name the execratory 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
 
 
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