Biology & Environment - WBCS Preliminary Question Paper

Biology Science WBCS Preliminary Question Paper

wbcs biology questions

WBCS Preliminary Question – 2022

Which one of the following animals is known as a ‘living fossil’?

(A) Peripatus

(B) Amoeba

(D) Apple snail

The radioactive element used in heart-pacemakers is

(Pu-238)

(A) Uranium

(B) Deuterium

(C) Plutonium

(D) Radium

The ‘powerhouse’ of cell is

(A) Nucleus

(B) Lysosome

(C) Mitochondria

(D) DNA

The first transgenic crop was

(1983)

(A) Tobacco

(B) Cotton

(D) Rice

Which part of human eye has the maximum refractive index?

(Lens – 1.42)

(A) Aqueous humour

(B) Vitreous humour

(C) Lens

(D) Cornea

Phytophthora palmivora is a

(fungus)

(A) bio-pesticide

(B) bio-insecticide

(C) mycoherbicide

(D) first bio-herbicide

What is the chromosome number in human ovum?

(A) 36

(B) 46

(D) None of the above

‘ELISA’ test is employed to diagnose

(enzyme-linked immunosorbent assay)

(A) Polio Virus

(B) AIDS antibodies

(D) Cancer

Which of the following is an aquatic fern?

(A) Adiantum

(B) Dryopteris

(C) Salvinia

(D) Equisetum

‘Seahorse‘ is a

(A) Mammal

(B) Plant

(C) Fish

(D) None of the above

Which one of the following animals is not ‘warm-blooded’?

(A) Hen

(B) Tiger

(D) Toad

The vitamin which helps in clotting of blood is

(A) A

(B) D

(D) K

Fermentation ability of Yeast is due to

(A) Amylase

(B) Zymase

(D) Galactase

Which metal is present in haemoglobin?

(A) Iron

(B) Zinc

(D) Copper

WBCS Preliminary Question – 2021

45. The leader of the Narmada Bachao Andolon is

(A) Anna Hajare

(B) Medha Patker

(D) Binayak Sen

76. ‘Chipko Andolon‘ is known as

(1973)

(A) Feminist Movement

(B) Tribal Movement

(D) Caste Movement

114. Started in June, 2014 by the Union Government of India, the ‘Namami Gange‘ Programme is associated with

(A) Worshipping the Ganga

(B) Canal irrigation from the Ganga

(D) National Mission for Clean Ganga

164. According to WHO, the official name of the virus responsible for Covid-19 disease is

(A) SARS-CoV-2

(B) Covid-19

(D) Corona Virus

172. Researchers has discovered recently antibody of which virus in bats from Mahabaleshwar cave ?

(A) Nipah

(B) Ebola

(D) Zika

WBCS Preliminary Question – 2020

122. Plants receive nutrients from

(nitrogen, phosphorus, potassium)

(A) atmosphere

(B) chlorophyll

(D) light

141. The greenhouse gas that is a product of the contribution of fossil fuels is

(A) CO2

(B) CH4

(D) N2O

155. Which can bind O2 molecules?

(A) Red blood cells

(B) White blood cells

(D) Vitamin E

189. Excess fluoride in drinking water causes

(A) Lung disease

(B) Intestinal Infection

(D) Rickets

WBCS Preliminary Question – 2019

128. The number of spinal nerves in human body are

(A) 12 pairs

(B) 31 pairs

(D) 12

145. The food that gives more calories per unit mass of food is

(Fat – 9 cal/gram)

(A) protein

(B) carbohydrates

(D) water

146. ECG records

(A) rate of heart beats

(B) potential difference

(D) volume of blood pumped

147. Bio gas consists of

(A) Carbon monoxide, Methane and Hydrogen

(B) Carbon dioxide, Methane 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.

(D) accumulates excess of fats.

WBCS Preliminary Question – 2018

57. Appiko movement associated with nature conservation was led by

(Sept 1983, Salkani, Karnataka )

(a) Sarala Ben of Ahmedabad

(b) Mira Ben of Rajkot

(d) Sundarlal Bahuguna of Kasauni

62. Life span of red blood cells is ________days.

(a) 60

(b) 120

(d) 240

70. Muscle fatigue is due to accumulation of

(C₃H₆O₃)

(a) Carbon Dioxide

(b) Creatinine

(d) Ethyl alcohol

84. The number of milk teeth in man is

(a) 28

(b) 29

(d) 12

94. Amounts of O₂ normally carried by 100 ml of pure human blood, is

(a) 40 ml

(b) 10 ml

(d) 30 ml

99. Which one of the following organs is the main respiratory organ of whale?

(a) Integuments

(b) Gills

(d) Trachea

149. Deficiency of Vitamin-D results in

(a) night blindness

(b) rickets

(d) hair fall

WBCS Preliminary Question – 2017

26. Nekton are

(A) floating organisms in water

(B) swimming organisms in water

(D) sub-merged plants in water

28. Barr body is absent in somatic cell of

(A) Klinefelter syndrome individual

(B) Tripple X syndrome individual

(D) Sub-human mammalian female individual

29. A mamal that lays eggs

(monotreme)

(A) Talpa

(B) Echinda

(D) Lemur

30. Which one of the following animal phylum is latest by discovery?

(1983 by Reinhardt Kristensen)

(A) Pogonophora

(B) Kinnorhyncha

(D) Ctenophora

34. An example of modified underground stem is

(Tuber)

(A) Carrot

(B) Potato

(D) Turnip

35. Crossing over occurs during meiosis at

(A) Leptotene

(B) Anaphase -I

(D) Diakinesis

36. “Particulate theory of inheritance” was proposed by

(A) Charles Darwin

(B) Gregor Johann Mendel

(D) T. H. Morgan

37. What is a bacteriophage

(A) A virus

(B) A bacterium growing in artificial nutrient medium

(D) A phagocytic protozoa

38. The nature of stele in primitive vascular plants was

(A) Protostele

(B) Siphonostele

(D) Atactostele

39. Which of the following processes makes direct use of oxygen?

(A) Glycolysis

(B) Fermentation

(D) Electron transport

40. The well-known antibiotic penicillin is obtained from this plant group:

(1929, Alexander Fleming)

(A) Algae

(B) Fungi

(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

(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

(D) Co-dominance

125. A short day plant has a critical day length of 14 hours. It will flower when the day length is :

(Photoperiodism)

(A) 15 hours

(B) 18 hours

(D) 16 hours

129. An endobiotic fungus is :

(A) Agaricus

(B) Morchella

(D) Polyporus

132. Gynobasic style is present in which family ?

(A) Mawaceae

(B) Solanaceae

(D) Orchidaceae

135. ‘Globule’ and ‘Nucule’ is found in :

(charophyte green algae)

(A) Oedogonium

(B) Rhizopus

(D) Chara

139. Spindle fibres are made up of :

(A) Flagellin

(B) Tubulin

(D) Chitin

143. A carcinoma is a cancer originating from :

(A) Epithelial tissue

(B) Connective tissue

(D) Nerve tissue

147. A muscle that is consciously controlled :

(Skeletal muscle)

(A) Striated voluntary

(B) Striated involuntary

(D) Non-striated involuntary

177. Grub is the larva of

(A) Insects

(B) Crustacea

(D) Sponges

180. According to the competitive exclusion principle, two species cannot continue to occupy the same :

(Gause’s law)

(A) Biome

(B) Habitat

(D) Niche

186. Target tissue of insulin is :

(liver)

(A) Red Blood Cell

(B) Kidney 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

(D) Autogamy

125. The Pyrimidine bases in a DNA are :

(A) Adenine and Guanine

(B) Thymine and Adenine

(D) Thymine and Cytosine

129. Which one of the following is the natural auxin ?

(Indole-3-acetic acid)

(A) NAA

(B) IAA

(D) IBA

132. During cell division, DNA synthesis takes place in

(A) Interphase

(B) Anaphase

(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

(D) Epistasis

143. Cerebral Malaria is caused by

(A) Plasmodium vivax

(B) Plasmodium malariae

(D) None of the above

147. “Natural Selection” is the theory from

(A) G. J. Mendel

(B) Charles Darwin

(D) None of the above

161. Coal, Petroleum and Natural Gas are examples of

(A) Fossil Fuels

(B) Cryogenic Fuels

(D) Radioactive Fuels

177. ‘Tasar’ silk fiber is produced by

(A) Antheraea mylitta

(B) Bombyx mori

(D) Antheraea assamensis

180. One turn of DNA helix measures

(A) 34A°

(B) 3.4A°

(D) 44A°

183. Phenotypic ratio of Mendelian Dihybrid cross is

(A) 9 : 3 : 3 : 1

(B) 1 : 1 : 1 : 1

(D) 1 : 2 : 1 : 1

186. Cranial nerve in mammals are

(A) 10 pairs

(B) 10

(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

(D) Telophase

38. The digested food is absorbed in

(A) Stomach

(B) Intestine (small)

(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.

(D) it has nodes, internodes and has brown, scaly leaves.

47. The longest cell in animals is

(Neuron)

(A) Nerve cell

(B) Hepatocyte (Liver cell)

(D) Muscle cell

55. The identifying features of carrot roots are

(taproot)

(A) Conical with small roots.

(B) Conical without 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

(D) Retinoblastoma

183. Which disease is caused by fungus ?

(A) Polio

(B) Malaria

(D) Cholera

188. Clove is obtained from

(A) Root

(B) Stem

(D) Flower bud

192. Which one of the following is not a true fruit ?

(Thalamus)

(A) Date

(B) Plum

(D) Grape

195. AIDS is caused by

(human immunodeficiency virus)

(A) Bacteria

(B) Virus

(D) Helminth

200. Monocotyledonous plants show which of the following feature ?

(grass-like flowering plants)

(A) Leaf shows reticulate venation

(B) Tap root system

(D) Perennial growth

WBCS Preliminary Question – 2013

80. In angiosperm, triple fusion is required for the formation of —

(sexual reproduction)

(A) Embryo

(B) Endosperm

(D) Pericarp

84. Forestation prevents

(A) Soil erosion

(B) Pollution

(D) All of the above

97. Oil is obtained from the endosperm of —

(A) Groundnut

(B) Coconut

(D) Sesame

100. The number of cervical vertebrae in mammal is —

(vertebrae of neck)

(A) Seven

(B) Seventeen

(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

(D) Diaphragm

115. Portion of the carapace which covers the gill of prawn is known as —

(Respiratory System)

(A) Bronchus

(B) Branchiostegal membrane

(D) Branchiostegal spine

119. Which one of the following is a rich source of amylase ?

(enzyme – starch into sugar)

(A) Brain

(B) Blood

(D) Pancreas

WBCS Preliminary Question – 2012

31. Adult Filaria worms live in human

(Filariasis)

(A) Blood

(B) Lymphatics

(D) Intestine

35. The disease caused due to lack of ADH

(Antidiuretic Hormone)

(A) Diabetes insipidus

(B) Diabetes mellitus

(D) Cushing’s disease

38. The animal group that is not found in marine water

(no true marine amphibians)

(A) Mammals

(B) Amphibian

(D) Aves

42. Normal human blood is

(pH range 7.35 to 7.45)

(A) Acidic

(B) Alkaline

(D) Variable

47. The non-poisonous snake is :

(A) Viper

(B) Krait

(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

(D) Transport of enzymes in plants

183. The ‘Theory of Natural Selection’ was proposed by

(1859)

(A) J. B. S Haldane

(B) G. J. Mendel

(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

(D) DNA damage

195. The plant body is not ‘differentiated into root, stem and leaves’ in

(A) Pteridophytes

(B) Angiosperms

(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

(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)

(D) Kydia Calycina

92. Name one rootless plant

(aquatic flower)

(A) Ceratophyllum

(B) Eichhornia

(D) Pistia

94. Watson and Crick are famous for their discovery of

(1953, Nature magazine)

(A) Life history of Plasmodium Vivax

(B) Vaccinia

(D) Antibodies

100. Nerve cells originate from the embryonic

(A) Ectoderm

(B) Endoderm

(D) Both endo and mesoderm

101. The number of amino acids occurring in nature is

(1935, William Cumming Rose)

(A) 10

(B) 20

(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

(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

(D) 1000 microns

121. The gastric glands in the stomach produce an enzyme

(Proteins to peptides)

(A) Insulin

(B) Ptyalin

(D) Trypsin

123. Which of the following is a terrestrial algae ?

(chlorophyte green algae)

(A) Chlorella

(B) Trentepohlia

(D) Sargassum

170. Kranz anatomy states that, plant has

(A) C3 cycle

(B) C4 cycle

(D) Both C3 and C4 cycle

190. Essential constituent of plant cells is the carbohydrate

(polymeric glucose – (C₆H₁₀O₅)_n)

(A) Cellulose

(B) Sucrose

(D) Lignin

WBCS Preliminary Question – 2010

29. The gene for Haemophilia is

(A) X-linked recessive

(B) X-linked dominant

(D) Located in autosome

30. The narrow portion between uterus and vagina of higher mammals is known as

(A) Clitoris

(B) Urethra

(D) Cervix

31. The toxic chemical element that caused Minamata disease in Japan was

(neurological disease)

(A) Uranium

(B) Mercury

(D) Arsenic

139. Forest Protection Committees consist of

(Joint forest management 1971-72)

(A) Forest Guards

(B) Panchayat Members

(D) Forest Department officials

32. The vegetative body of a dryophyte/moss represents the structure of

(A) Sporophyte

(B) 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

(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

(D) Having more myosin

39. In photosynthesis, ‘Light reaction’ takes place in

(A) Cytosol

(B) Grana of Chloroplast

(D) Ribosome

41. Haversian system is a part of

(Haversian canals)

(A) Kidney

(B) Bone

(D) Brain

45. Polytene chromosome is found in the cells of

(Dipteran Flies)

(A) Salivary gland of larvae of flies

(B) Liver of man

(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

(D) Mesophytes

51. Which Carbohydrate is used commercially in the silvering of mirrors ?

(A) Sucrose

(B) Fructose

(D) Glucose (C₆H₁₂O₆)

53. Which metal ion is responsible for electron transportation in photosynthesis ?

(A) Sodium

(B) Potassium

(D) Iron

57. The technique of ‘DNA sequencing’ was discovered by

(1953)

(A) H. G. Khorana

(B) Watson and Crick

(C) Frederick Sanger

(D) E. M. Southern

59. A Cladogram depicts the hypothesis of

(phylogeny)

(A) Evolutionary relationship

(B) Phenatic relationship

(D) Taxonomic relationship

124. AIDS/HIV virus is a type of

(RNA converted into DNA)

(A) DNA virus

(B) RNA virus

(D) Both DNA and RNA virus

155. In respiration, cytosol plays a significant role in

(A) Oxidative phosphorylation

(B) Oxidative decarboxylation of pyruvic acid

(D) Glycolysis

186. Coastal Regulation Zones in India have been identified on the basis of

(Feb 1991)

(A) Tidal Height

(B) Sea Level Rise

(D) Undersea Bathymetry

WBCS Preliminary Question – 2009

58. How much percent of human body is water by weight ?

(actually 60%)

(A) 66

(B) 50

(D) 10

62. Iodine is administered to patients suffering from

(A) Goitre

(B) Night blindness

(D) Rheumatism

72. Vitamin C is

(A) Tocopherol

(B) Cyanocobalamin

(D) Thiamine

75. Greenhouse effect is caused by addition of too much of this compound in atmosphere.

(A) Carbon di-oxide

(B) Ammonia

(D) Dust particles

80. Edible portion of coconut is the

(A) Fruit wall

(B) Endosperm

(D) Embryo

84. From which part of Cinchona plant quinine is obtained ?

(A) Seed

(B) Leaf

(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

(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

(D) Any time

104. Which of the following vitamins forms the prosthetic group of acyl-COA dehydrogenase ?

(A) Nicotinic acid

(B) Pyridoxine

(D) Riboflavin

109. Name the excretory organ of prawn

(Arthropod)

(A) Salivary gland

(B) Green gland

(D) Malpighian tubule

112. Ruminant Stomach is possessed by

(A) Cow

(B) Dog

(D) Cameleon

115. As per the concept of Scheduled India wild life conservation concept, Rhinoceros indica is incorporated in

(Wildlife Protection Act, 1972)

(A) Schedule I

(B) Schedule II

(D) None of the above

119. From Antheraea assamensis the type of silk obtained is

(A) Tasar

(B) Munga

(D) Mulberry silk

88. Which of the following International Conventions provides framework for conservation of wetland habitats ?

(2 Feb 1971)

(A) Earth Sumit

(B) Ramsar Convention

(D) Botanical Congress

WBCS Preliminary Question – 2008

102. Amount of blood pumped by an adult heart per hour is about

(A) 150 litre

(B) 200 litre

(D) 340 litre

103. A bacterium differs from virus with respect to

(A) DNA

(B) RNA

(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

(D) Contiguity learning

112. The instrument used for measuring blood pressure is called

(A) Barometer

(B) Sphygmomanometer

(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

(D) None of the above

118. Complete loss of memory is termed

(A) Trauma

(B) Amnesia

(D) Paramnesia

122. The ingredient that assists clotting of blood is

(A) Vitamin A

(B) Folic acid

(D) Vitamin K

123. The causative organism of malignant malaria in human being is

(A) Plasmodium vivax

(B) Plasmodium falciparum

(D) Plasmodium ovale

132. The nitrogen base absent in DNA

(A) Uracil

(B) Adenine

(D) Cytosine

137. Stimulating the occipital area of the brain produces sensation of

(A) Vision

(B) Taste

(D) Touch

142. Ribosomes play a significant role in

(A) Photosynthesis

(B) Protein synthesis

(D) Respiration

143. The Greenhouse effect gases trap only the heat of following radiations:

(A) Ultraviolet

(B) Infrared

(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

(D) Cross-sectional

152. Name of a insectivorous plant

(A) Gulancha

(B) Nayantara

(D) Pitcher Plant

154. Which of the following is not a stimulant ?

(A) Caffeine

(B) Barbiturates (depressant)

(D) Amphetamines

162. Cancer is caused by activation of genes

(A) Regulatory genes

(B) Oncogenes

(D) Jumping genes

164. Parkinson’s disease is characterised by the loss of nerve cells in the

(A) Cingulate cortex

(B) Substantia nigra

(D) Cerebral cortex

167. Most patients hospitalised for mental disorders suffer from

(A) Neurosis

(B) Depression

(D) Schizophrenia

172. Flowers without petals are pollinated by

(A) Bees

(B) Birds

(D) Wind

174. As we age, the cognitive ability that declines most is the ability to

(A) Recall new information

(B) Remember small details

(D) Use new information

176. Predisposing cause of a disease are referred to as

(A) Ethnology

(B) Ecology

(D) Environmental factors

181. The biochemical processes taking place in the body is known as

(A) Anabolism

(B) Catabolism

(D) None of the above

182. RNA of retrovirus can produce DNA by

(A) DNA polymerase

(B) RNA polymerase

(D) Reverse transcriptase

184. Following pairs that is incorrectly matched is

(John Bowlby’s attachment theory)

(A) Beck-cognitive therapy

(B) Adler-individual therapy

(D) Bowlby-behaviour therapy

192. The intermediate host of Leishmania donovani is

(kala-azar parasites)

(A) Sand fly

(B) Tse-tse fly

(D) Anopheles mosquito

194. The WISC-R test is

(A) An individual test for adults

(B) An individual 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

(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

(D) G-factor

WBCS Preliminary Question – 2007

27. The Phyto-hormone responsible for senescence

(A) Cytokinin

(B) Auxin

(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

(D) None of the above

83. A virion is

(A) Infective particle of virus

(B) Infective particle of bacteriophage

(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

(D) Sulphur di-oxide

87. A peduncle is a

(A) Stalk of flower

(B) Stalk of a leaf

(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

(D) Sarcoptes mite

119. The genetic make-up of a normal human male consists of

(A) XY Chromosomes

(B) XO Chromosomes

(D) XXO Chromosomes

132. Which one of the following is a polymorphic species?

(A) Garden lizard

(B) Spider

(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

(D) Carnivores

139. A plant virus causing disease of the vegetables:

(A) Tobacco Mosaic virus

(B) Cauliflower Mosaic virus

(D) None of the above

145. Chemically Sporopollenin is a

(A) Co-polymer of carotenoids & fatty acid

(B) Carbohydrate

(D) Lactic acid

WBCS Preliminary Question – 2006

29. In plants, the receptor for detecting photoperiodism is

(a) Sensory cell

(b) Sensory organelles

(d) Gradient of K

30. Urea is produced in the body of man in

(a) Liver

(b) Urinary Bladder

(d) Hemoglobin

36. Fruit fall can be prevented by spraying
(Indole-3-acetic acid)

(a) IAA

(b) Abscisic acid

(d) NAA

37. Restriction enzymes are synthesized by

(a) All eukaryotic cells

(b) Yeast and bacteria only

(d) All cells

40. Primary and Secondary growth are inhibited by

(a) Auxin

(b) Gibberelins

(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

(d) 8

112. Connecting link between reptiles and birds is

(a) Archaeopteryx

(b) Platypus

(d) Whale

119. Which of the following is not a kidney function?

(a) Ultra filtration

(b) Tubular Reabsorption

(d) Phagocytosis

170. Coconut inflorescence is

(a) Racemose

(b) Hvpanthodium

(d) Spadix

187. Loop of Henle lies in the

(a) Cortex

(b) Medulla

(d) Ureter

190. A viral disease is

(a) Cancer

(b) Leukemia

(d) Yellow Fever

195. Which one is not a protozoa?

(a) Hydra

(b) Euglena

(d) Paramaecium

WBCS Preliminary Question – 2005

39. According to Darwin the unit of Natural Selection is

(a) Individual

(b) Family

(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

(d) Fern

49.The main function of norepinephrine is to

(a) increase blood pressure

(b) increase urine formation

(d) release epinephrine

63.Which one of the following plant tissues is composed of dead cells?

(a) Xylem

(b) Phloem

(d) Hypodermis

94.Which one of the following blood-group bearing persons is called a universal donor?

(a) A

(b) B

(d) O

96.The largest reservoir of Nitrogen on Earth is

(a) Soil

(b) Air

(d) Rock

104.According to cellular structure which one of the following is most complex?

(a) Bacteria

(b) Protozoa

(d) Fungi

105.Plants store glucose in the form of

(a) Monosaccharide

(b) Cellulose

(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

(d) ten litres

114.Of the twenty amino acids how many are considered essential?

(a) Six

(b) Nine

(d) Fourteen

135. Cholesterol is a/an

(a) Saturated fat

(b) Unsaturated fat

(d) Diglyceride

136.Which one of the following animals possess least number of body segments?

(a) Flat worm

(b) Earth worm

(d) Cockroach

137.Sweat, saliva and tear contain an enzyme called Lysozyme. It kills

(a) Virus infected cells

(b) Protozoa

(d) Virus

162. Antibodies are synthesized by

(a) Bone marrow

(b) Plasma and Lymph

(d) Kidney

167.The first hormone produced by Genetic Engineering is

(a) Estrogen

(b) Testosterone

(d) Insulin

196.The scientific name of Vitamin ‘C’ is

(a) Acetic acid

(b) Muriatic acid

(d) Lactic acid

WBCS Preliminary Question – 2003

36. Pitcher plant is

(A) Autotrophic

(B) Heterotrophic

(D) Actinomorphic

46. AIDS is

(A) Viral disease

(B) Fungal disease

(D) Genetically disease

56. Universal donor in blood transfusion refers to

(A) Blood Group A

(B) Blood Group B

(D) Blood Group O

66. Scurvy is caused by the deficiency of

(A) Vit. A

(B) Vit. B

(D) Vit. D

76. Which of the following becomes zero in a fully turgid cell?

(A) Water potential

(B) Wall pressure

(D) All of the above

86. Colles’ fracture is associated with

(A) Humerus

(B) Radius

(D) Femur

96. Septicemia is

(A) Food poisoning

(B) Blood poisoning

(D) None of the above

106. Malaria is caused by

(A) Plasmodium

(B) Anopheles mosquito

(D) Bad air

136. The following animal has the similar vision as we have

(A) Crow

(B) Owl

(D) Pigeon

156. The genetic information are carried by

(A) Protein

(B) Fatty acids

(D) Carbohydrate

186. Which of the following is the hardest substance in the human body?

(A) Bone

(B) Enamel

(D) Nail

196. The following animal is called friend of farmer:

(A) Cow

(B) Earthworm

(D) Honey-bee

WBCS Preliminary Question – 2002

25. During photosynthesis,

(A) Presence of oxygen is essential

(B) Catabolic reaction takes place

(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

(D) Archaeoptaryx (Extinct)

72. Fixation of nitrogen is meant

(A) Liquefaction of nitrogen

(B) Conversion of atmospheric nitrogen into useful compound

(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

(D) Thyroid gland

26. Identify from the following names the person who is associated with the Chipko movement

(A) BabaAmte

(B) Sunderlal Bahuguna

(D) Arundhuti Roy

104. Normal leaves are called

(A) Seed leaves

(B) Flora leaves

(D) Scale leaves

142. Roots of a tree are

(A) Negatively geotropic

(B) Positively geotropic

(D) Negatively hydrotropic.

146. Majority of animal-viruses contain

(A) DNA

(B) RNA

(D) None of DNA

147. In which part of human body, urea is produced?

(A) Kidneys

(B) Liver

(D) Urinary bladder

159. Which of the following vitamin is most easily destroyed by heat and air?

(A) A

(B) B

(D) D

163. Refrigeration helps in food preservation by

(A) Killing bacteria and germs

(B) Greatly retarding the rates of biochemical reaction

(D) Stopping enzyme action

173. Which of the following is an infectious bacterial disease?

(A) Conjunctivitis

(B) Diphtheria

(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

(D) real and inverted

130. The erosion of soil by winds can be best controlled by

(A) afforestation

(B) removal of vegetation

(D) creation of wind breaks

66. Chlorine is not a constituent of

(A) DDT

(B) chlorophyll

(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

(D) it is not formed in the body and has to be provided through food

90. _____ is an antivitamin.

(A) beta carotene

(B) methylcobalamin

(D) folic acid

101. Which part of ear maintain the balance of our body?

(A) otolith

(B) malleus

(D) cochlea

161. Which one of the following is a protozoa?

(A) Pea mosaic

(B) Entamoeba histolytica

(D) Yariola

162. The disease caused by the deficiency of vitamin B12

(A) aplastic anaemia

(B) sickle cell anaemia

(D) pernicious anaemia

163. The National Wildlife Action Plan was adopted by India in

(3rd Plan 2017-31)

(A) 1963

(B) 1973

(D) 1993

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.

(D) 25 cm.

37. Which one of the following in not an autotrophy?

(primary producer)

(A) Grass

(B) Green Algae

(D) Fern

38. Photosynthetic plants store glucose as

(A) Sucrose

(B) Starch

(D) Glycogen

40. In the present concept of evolution the unit of evolution is

(A) Individual

(B) Families

(D) Species

41. Which one of the following is a Reptile?

(A) Salamander

(B) Turtle

(D) Shark

42. Yellowing of plant leaves is called chlorosis, Insufficiency of which ion causes it?

(A) Sodium

(B) Phosphorus

(D) Magnesium

43. A red blood cell lives for about

(A) One week

(B) One month

(D) One year

44. The percentage of solar energy absorbed by the leaves of green plant in photosynthesis is

(A) 1

(B) 10

(D) 50

Biology & Environment – WBCS Preliminary Question Paper

wbcs biology questions

WBCS Preliminary Question – 2022

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WBCS Preliminary Question – 2015

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WBCS Preliminary Question – 2012

WBCS Preliminary Question – 2011

WBCS Preliminary Question – 2010

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WBCS Preliminary Question – 2008

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WBCS Preliminary Question – 2002

WBCS Preliminary Question – 2001

WBCS Preliminary Question – 2000

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