CUSAT CAT 2021 Question Paper Zoology

ZOOLOGY

1. Down syndrome is caused due to

(A) Monosomy
(B) Nullisomy
(C) Trisomy
(D) Tetrasomy

2. Itai-Itai, a bone softening disease is due to the poisoning by
(A) Cadmium
(B) Mercury
(C) Zinc
(D) Lead

3. Angiotensin stimulates the adrenal cortex to produce

(A) ADH
(B) Vasopressin
(C) Insulin
(D) Aldosterone

4. Antibodies are produced by

(A) Bone marrow
(B) B cell
(C) Spleen
(D) T cell

5. Prolactin is responsible for

(A) milk production
(B) the growth of mammary gland
(C) milk expulsion
(D) the extraordinary growth of mammary gland

6. Chemically, insulin is a

(A) Steroid
(B) Protein
(C) Lipid
(D) Carbohydrate

7. The test which is used to confirm HIV infection is

(A) Western Blot
(B) ELISA
(C) Diploid cell staining
(D) Pure culture

8. The term ‘heterosis’ represents

(A) Male sterility
(B) Hybrid vigour
(C) Hybrid incompatibility
(D) Cladogen

9. Which of the following is associated with Minamata disease?

(A) Cadmium
(B) Lead
(C) Mercury
(D) Trichomonads

10. Monophagy is a mode of feeding on

(A) a mixed food
(B) a selected type food
(C) a variety of food
(D) a single type of food

11. Oncology is the study of

(A) Birds
(B) Mammals
(C) Cancer
(D) Tiddues

12. Who gave experimental support to semiconservative mode of DNA replication?

(A) Watson and Crick
(B) Messelson and Stahl
(C) Beattle and Tantee
(D) William and Frankli

13. The phenomenon of ‘summer sleep’ by animals is called

(A) hibernation
(B) aestivation
(C) laziness
(D) lethargy

14. The largest structure in the cell is

(A) Golgi apparatus
(B) Mitochondria
(C) Nucleus
(D) Centrosome

15. Which of the following is a poor source of protein?

(A) Egg
(B) Pulses
(C) Meat
(D) Rice

16. Typhoid is caused by

(A) Salmonella typhi
(B) Klebsiella oxytoca
(C) Psudomonas aeruginosa
(D) Escherichia coli

17. Which is not a non-degradable pollutant?

(A) DDT
(B) Sewage
(C) Plastic
(D) Heavymetals

18. Heparin is formed by

(A) Liver cells
(B) Plasma cells
(C) Blood cells
(D) Spleen cells

19. The most beneficial activity of insects is

(A) they are good source of food
(B) they are good soil builders
(C) they are good pollinators
(D) they are good scavengers

20. The most abundant monosaccharide in nature is

(A) Lactose
(B) Glucose
(C) Maltose
(D) Sucrose

21. Race-way culture refers to culture of organisms in

(A) Pond
(B) River
(C) Lake
(D) Reservoir

22. One of the following is an example of floating weeds

(A) Vallisneria
(B) Spirogyra
(C) Nymphae
(D) Eichornia

23. In using oil immension lens, the media is

(A) Cedar wood oil
(B) Sandal wood oil
(C) Mustard oil
(D) Cashew nut oil

24. ‘Fecundity’ – is the capacity found in fishes which refers to

(A) egg laying
(B) sperm forming
(C) giving birth to young ones
(D) spawning behaviour

25. Which of the following is called American cotton bollworm?

(A) Rabila frontalis
(B) Dysdercus unigulatus
(C) Helicoverpa armigera
(D) Anomis flava

26. Non-disjunction leads to

(A) Euploidy
(B) Polyploidy
(C) Enuploidy
(D) Aneuploidy

27. White Spot Disease is caused by

(A) a Bacteria
(B) a Virus
(C) a Parasite
(D) None of the above

28. Which of the following has a dimorphic nucleus?

(A) Amoeba proteus
(B) Paramecium caudatum
(C) Plasmodium vivax
(D) Trypanosoma gambiense

29. Lateral line system is found in

(A) frog
(B) bird
(C) fish
(D) rat

30. The Pyrimidines in DNA are

(A) Cytosine and Uracil
(B) Thymine and Cytosine
(C) Guanine and Adenine
(D) Guanine and Cytosine

31. The protein part of an enzyme is called

(A) Holoenzyme
(B) Apoenzyme
(C) Prosthetic group
(D) Cofactor

32. Fertilizin is found on

(A) eggs
(B) sperms
(C) walls of uterus
(D) walls of seminal vesicle

33. The primary function of melatonin is

(A) to conserve body heat
(B) to protect the skin from UV rays
(C) to protect the skin against sun burns
(D) to give a beautiful complexion to the skin

34. In cryopreservation, the preservative used is

(A) formaldehyde gas
(B) liquid nitrogen
(C) liquid neon
(D) liquid formaldehyde

35. Ductless glands which pour their secretions into the blood are termed as

(A) Endocrine
(B) Holocrine
(C) Apocrine
(D) Exocrine

36. The shape of the HIV is

(A) isohedral
(B) spherical
(C) helical
(D) triangular

37. X-ray diffraction studies of DNA were carried out by

(A) Wilkins and Watson
(B) Watson and Crick
(C) Franklin and Watson
(D) Wilkins and Franklin

38. Following are the water borne diseases except

(A) Cholera
(B) Pertussis
(C) Typhoid
(D) Hepatitis A

39. Which of the following is used as the biocontrol for Lepidopteran pests?

(A) Bacillus bacteria
(B) Nematodes
(C) Trichogramma
(D) Lady bird beetle

40. One of the principal mediators of inflammatory responses is

(A) Alkylamine
(B) Histamine
(C) Interferon
(D) Peptone

41. Which of the following is a nucleoprotein?

(A) Keratin
(B) Chromatin
(C) Histone
(D) Proteoglycan

42. One of the cells into which the egg divides during the cleavage phase of
embryogenesis is

(A) Blastomere
(B) Blastoderm
(C) Blastemaa
(D) Blastocyst

43. Energy requiring process by which secretary granules discharge their contents by
fusing with the cell membrane is known as

(A) Exocytosis
(B) Endocytosis
(C) Pinocytosis
(D) Phagocytosis

44. Ozone layer depletion is due to

(A) Polycyclic aromatic hydrocarbons
(B) Chloroflurocarbons
(C) Oxygen
(D) Carbon dioxide

45. Which is the pacemaker of heart?

(A) SA Node
(B) Purkinje fiber
(C) Bundle of His muscle
(D) AV Node

46. Germplasm theory was proposed by

(A) Weismann
(B) Roux
(C) Muller
(D) Haeck

47. Formation of yolk is called

(A) Oogenesis
(B) Yolkogenesis
(C) Vitellogenesis
(D) Albumenosis

48. Which of the following is a primary lymphoid organ?

(A) Lymph node
(B) Bone marrow
(C) Spleen
(D) Tonsile

49. The concept of ‘pyramid’ in ecology was introduced by

(A) Hackel
(B) Spancer
(C) Charles Elton
(D) Galton

50. The study of fresh water ecosystem is called

(A) Limnology
(B) Hydrology
(C) Barology
(D) Aqualogy

51. Which is known as a ‘missing link’ in evolution?

(A) Archaeopteryx
(B) Myohippus
(C) Pesipattu
(D) Sphenodon

52. In brain, respiratory centre is situated in

(A) Medulla oblongata
(B) Hypothalamus
(C) Cerebrum
(D) Cerebellum

53. The addictive substance in tobacco is

(A) Nicotinic acid
(B) Nicotinamide
(C) Niacin
(D) Nicotine

54. The major constituent of biogas is

(A) Carbon dioxide
(B) Methane
(C) Ethanol
(D) Hydrogen

55. ‘Super bug’ used for cleaning oil spills in sea is a manipulated

(A) Bug
(B) Insect
(C) Bacteria
(D) Virus

56. The monohybrid ratio according to Mendelian principles is

(A) 3:1
(B) 1:2:1
(C) 9:3:3:1
(D) 12:3:1

57. Which vitamin is required for blood coagulation?

(A) Vitamin K
(B) Vitamin A
(C) Vitamin C
(D) Vitamin E

58. The animals that can tolerate wide range of salt concentrations are called

(A) Stenohaline
(B) Euryhaline
(C) Volume conformers
(D) Ionic conformers

59. Nucleotide is the combination of

(A) Nucleoside and phosphate group
(B) Nucleotide and phosphate group
(C) Nucleoside and sugar
(D) Sugar, Phosphoric acid and Nucleoside

60. Which one of the following enzymes is not proteinacious in nature?

(A) Rennin
(B) Ribozyme
(C) Pepsin
(D) Trypsin

61. Chronic excretion of large amounts of urine of low specific gravity is indicative of

(A) diabetes innocens
(B) diabetes insipidus
(C) diabetes intermittens
(D) diabetes mellitus

62. Silver fish is a/an

(A) Fish
(B) Insect
(C) Crustacean
(D) Chanos chanos

63. Which of the following is referred as ‘Living fossil’?

(A) Lamprey
(B) Latimeria
(C) Hag fish
(D) Mackerel

64. Exposure to a toxicant occurring in high amounts for short periods of time.

(A) Acute exposure
(B) Chronic exposure
(C) Sub chronic exposure
(D) Long term exposure

65. DNA footprinting technique is usually used to identify:

(A) the sites of DNA where DNA binding proteins attach
(B) the segment of DNA which codes for a specific protein
(C) the binding site of RNA polymerase to its promoter region
(D) the site for termination of transcription processes

66. Over activity of the thyroid gland is called

(A) Addison disease
(B) Cushing syndrome
(C) Hyperthyroidism
(D) Hypothyroidism

67. The “master gland” of the endocrine system, located at the base of the brain, is the

(A) Apical gland
(B) Bartholin gland
(C) Pituitary gland
(D) Thyroid gland

68. Metaphase of cell division is arrested by

(A) Glycerol
(B) Colchicine
(C) Glycosteroid
(D) Trisodium citrate

69. Allopatric populations are those, which

(A) inhabit different geographical areas
(B) inhabit same geographical area
(C) occur everywhere
(D) occur nowhere and are extinct

70. ‘EDTA’ is used as a/an

(A) Binding agent
(B) Cooling agent
(C) Clotting inhibitor
(D) Anti-chelating agent

71. Chlorella sp are widely used in the removal of

(A) organic wastes
(B) hydrocarbons
(C) heavy metals
(D) all of the above

72. Viable material of endangered species can be preserved by

(A) Gene bank
(B) Gene library
(C) Gene pool
(D) Herbarium

73. Which group of vertebrates comprises the highest number of endangered species?

(A) Mammals
(B) Fishes
(C) Birds
(D) Reptiles

74. Which is the ‘animal symbol’ of W.W.F (World Wildlife Fund)?

(A) Red Panda
(B) Giant Panda
(C) Tiger
(D) Kangaroo

75. Testosterone is produced by

(A) Sertoli cells
(B) Leydig’s cells
(C) Oxyntic cells
(D) Pituitary gland

76. Emphasema is caused by

(A) UV-Radiation
(B) water pollution
(C) air pollution
(D) noise pollution

77. Which is the World Wildlife week?

(A) First week of September
(B) Last week of September
(C) First week of October
(D) Last week of October

78. Which gas (formed from reaction with UV rays) is both pollutant and beneficial to
life?

(A) Oxygen
(B) Ozone
(C) Methane
(D) Carbon dioxide

79. Which of the following phyla of animals is exclusively marine?

(A) Protozoa
(B) Porifera
(C) Echinodermata
(D) Mollusca

80. The main component of photochemical smog is

(A) PAN
(B) O3
(C) Both (A) and (B)
(D) SO2

81. Effect of thyroxine on B.M.R is

(A) increase
(B) uncertain
(C) decrease
(D) no effect

82. Which hormone facilitates child birth?

(A) Oxytocin
(B) FSH
(C) LH
(D) Prolactin

83. Blastopore is

(A) found in blastula
(B) present at future anterior
(C) the external opening of gastrocoel
(D) the opening of neural tube end of embryo

84. Bile is stored in the

(A) left lobe of liver
(B) right lobe of liver
(C) cystic duct
(D) gall bladder

85. Chromosomal theory of inheritance was given by

(A) Sutton and Boveri
(B) Morgan
(C) Darwin
(D) Correns

86. Groups of identical cells specialized for performing similar functions are called

(A) Identical cells
(B) Organs
(C) Tissues
(D) Organelles

87. Dengue virus is transmitted by

(A) Anopheles mosquito
(B) Aedes mosquito
(C) Culex mosquito
(D) Mansonia

88. Number of hydrogen bonds between Cytosine and Guanine is
(A) 3
(B) 4
(C) 2
(D) 6

89. Our bones and teeth are generally made of
(A) Hydrolith
(B) Chloropetite
(C) Fluoropetite
(D) Tricalcium phosphate

90. Nereis belongs to the class

(A) Polychaeta
(B) Hirudinea
(C) Oligochaeta
(D) Animalia

91. One of the following is not a function of bones.

(A) Place for muscle attachment
(B) Protection of vital organs
(C) Secretion of hormones for calcium regulation in blood and bones
(D) Production of blood corpuscles

92. True species are

(A) Interbreeding
(B) Sharing the same niche
(C) Inbreeding
(D) Reproductively isolated

93. Malpighian tubules are:

(A) Excretory organs of insects
(B) Excretory organs of frog
(C) Respiratory organs of insects
(D) Endocrine glands of insects

94. LH and FSH are collectively called

(A) Oxytocin
(B) Somatotropins
(C) Luteotropins
(D) Gonadotropins

95. In India, Lion (Panthera lea) is now restricted to

(A) Kaziranga Sanctuary (Assam)
(B) Gir forest (Gujarat)
(C) Annamalai Sanctuary (Tamil Nadu)
(D) Corbet National Park (Uttar Pradesh)

96. Hair, nails, hoofs and horns are formed with the help of a protein called

(A) Keratin
(B) Globulin
(C) Chitin
(D) Histone

97. Indian Ornithologist known as ‘Bird man of India’ is

(A) Dr. M.S .Mani
(B) Dr.R.Manocha
(C) Dr.Salim Ali
(D) Dr.P.K.Mehta

98. Anadromous fishes move

(A) From sea to fresh water
(B) From sea to estuary
(C) From river to sea
(D) From estuary to sea

99. Which Annelidan animal is sanguivorous?

(A) Earthworm
(B) Leech
(C) Turbellaria
(D) Aphrodite

100. Monotremes are unique mammals, since they

(A) Possess hair
(B) Give birth to live young ones
(C) Secret milk in a pouch
(D) Lay eggs

101. Night blindness is caused by the deficiency of

(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D

102. Ptyalin is an enzyme produced in the

(A) Salivary glands
(B) Pituitary glands
(C) Thyroid glands
(D) Pancreas

103. Quinine, used as remedy for malaria is extracted from

(A) Bark of Cinchona plant
(B) Bark of Cinnamon
(C) Ocimum leaves
(D) None of the above

104. Which of the following glands has both endocrine and exocrine nature?

(A) Liver
(B) Pancreas
(C) Thyroid
(D) Mammary glands

105. In urochordates, notochord is present

(A) Throughout the body
(B) In the abdominal region
(C) Only in larval tail
(D) Larval pharynx

106. Which era is known as “the golden age of reptiles”?

(A) Archaeozoic
(B) Proterozoic
(C) Paleozoic
(D) Mesozoic

107. Receptors stimulated by touch and pressure, vibrations and balance

(A) Chemoreceptors
(B) Mechanoreceptors
(C) Photoreceptors
(D) Thermoreceptors

108. ‘Project Tiger’ was launched in India in the year

(A) 1973
(B) 1975
(C) 1978
(D) 1990

109. Respiratory pigment in fishes is

(A) Haemoglobin
(B) Haemocyanin
(C) Erythrocyanin
(D) None

110. Which one of these is a cartilaginous fish?

(A) Star fish
(B) Dog fish
(C) Cray fish
(D) Silver fish

111. The book “Systema Naturea” was written by

(A) Linnaeus
(B) Lamarck
(C) Aristotle
(D) Darwin

112. Which is the correct order of phases of meiosis?

(A) Leptotene, Pachytene, Zygotene, Diplotene, Diakinesis
(B) Leptotene, Diakinesis, Pachytene, Diplotene, Zygotene
(C) Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis
(D) Diakinesis, Diplotene, Pachytene, Zygotene, Leptotene

113. Aristotle’s lantern is present in

(A) Sea lilies
(B) Sea cucumber
(C) Sea urchin
(D) Sea pen

114. Brittle star belongs to the class

(A) Asteroidea
(B) Ophiuroidea
(C) Crinoidea
(D) Echinoidea

115. Butterfly has which of the following types of mouth parts?

(A) Piercing and sucking type
(B) Siphoning type
(C) Sponging type
(D) Chewing and sucking type

116. Which state is the largest producer of silk in India?

(A) Karnataka
(B) Andhra Pradesh
(C) Assam
(D) West Bengal

117. The scientist who decoded the language of bees is

(A) Charles Darwin
(B) William Harvey
(C) Karl von Frisch
(D) Carolus Linnaeus

118. Which part of a mollusk can make a hard shell?

(A) Foot
(B) Mantle
(C) Ctenidia
(D) Placoid

119. After the discharge of oocyte, the Graafian follicle forms a yellow body known as

(A) Corpus allatum
(B) Corpus callosum
(C) Corpus cardiacum
(D) Corpus luteum

120. Trypsin is secreted by

(A) Stomach
(B) Pancreas
(C) Liver
(D) Duodenum

121. Synthesis of vitamin D with the help of sunlight takes place in

(A) Skin
(B) Liver
(C) Adipose tissue
(D) Gall bladder

122. The pH of blood in arteries and veins is

(A) Same
(B) More in arteries and less in veins
(C) Not definite
(D) Less in arteries and more in veins

123. Animals that are well known for the use of pheromones are

(A) Centipedes
(B) Hydra
(C) Pigeons
(D) Ants

124. Pseudociliated epithelium is a characteristic feature of mucous membrane of

(A) Liver
(B) Heart
(C) Trachea
(D) Stomach

125. The life span of RBC is

(A) 100 days
(B) 110 days
(C) 120 days
(D) 130 days

126. Birds excrete nitrogenous wastes in the form of

(A) Urea
(B) Ammonia
(C) Fatty acids
(D) Uric acid

127. Cretinism is a human disorder which is due to the under-secretion of

(A) Adrenalin
(B) Cortisone
(C) Glucagon
(D) Thyroxin

128. The first successful heart transplantation was performed by

(A) Dr. William Harvey
(B) Sir F. G. Hoffkins
(C) Dr. Louis Pasture
(D) Dr. Christiaan Barnard

129. When there is a decrease in the concentration of oxygen in the blood, the breathing
rate

(A) Increases
(B) Decreases
(C) First increases and then decreases
(D) Is not affected

130. Bats can fly in the dark because

(A) They have a better vision in the dark
(B) The pupils of their eyes are very big
(C) They are guided by ultrasonic waves produced by them
(D) Any bird can do this

131. Eukaryotic chromosome is

(A) Nucleoprotein
(B) Lipoprotein
(C) Lipopolysaccharide
(D) Galactolipid

132. In Nitrogen cycle, soil nitrates are transformed into free nitrogen by

(A) Nitrifying bacteria
(B) Denitrifying bacteria
(C) Ammonifying bacteria
(D) None of the above

133. Placoid scales are present in

(A) Labeo
(B) Scoliodon
(C) Hippocampus
(D) Protopterus

134. Competition for light, nutrients and space is most severe between

(A) Closely related organisms growing in different niches
(B) Closely related organisms growing in the same area/niche
(C) Distantly related organisms growing in the same habitat
(D) Distantly related organisms growing in different niches

135. The length of one helix of DNA is

(A) 25 A°
(B) 3.4 A°
(C) 10 A°
(D) 34 A°

136. Both respiration and photosynthesis require

(A) Glucose
(B) Sunlight
(C) Chlorophyll
(D) Cytochrome

137. The larva of Balanoglossus is

(A) Tornaria
(B) Auricularia
(C) Nauplia
(D) Zoea

138. Lysosome

(A) is an enzyme that degrades bacterial cell wall
(B) contains hydrolases with acidic pH optima
(C) is defective in Zellweger syndrome
(D) is enclosed by toe membranes

139. Agar is extracted from

(A) Red algae
(B) Brown algae
(C) Green algae
(D) Blue green algae

140. Oxygen haemoglobin dissociation curve will shift to right on decrease of

(A) Acidity
(B) Carbon dioxide concentration
(C) pH
(D) Temperature

141. The larva of the Echinodermata shows

(A) Bilateral symmetry
(B) Biradial symmetry
(C) Pentamerous radial symmetry
(D) Radial symmetry

142. C R Z means

(A) Coastal Recovery Zone
(B) Coastal Regulation Zone
(C) Coastal Resources Zone
(D) Coastal Response Zone

143. Filariasis or Elephantiasis is transmitted by

(A) Mosquito
(B) Bed bug
(C) Fruit fly
(D) House fly

144. The animals which give birth to young ones are said to be

(A) Viviparous
(B) Oviparous
(C) Ovoviviparous
(D) Viviovoparous

145. Readily available energy in a cell remains in the form of

(A) Fat
(B) Glucose
(C) ATP
(D) Glycogen

146. Pore bearing organisms are called as

(A) Helminthes
(B) Echinoderms
(C) Poriferans
(D) Annelidans

147. Insulin is secreted by

(A) Alpha cells of islets of langerhans
(B) Beta cells of islets langerhans
(C) Liver
(D) Gall bladder

148. The poison glands of poisonous snakes are modified

(A) Buccal glands
(B) Palantine glands
(C) Salivary glands
(D) Lacrymal glands

149. The blood group known as universal recipient is

(A) B
(B) A
(C) AB
(D) O

150. Which of the following is not a coelenterate?

(A) Jelly fish
(B) Sea pen
(C) Portuguese man of war
(D) Cuttle fish

ANSWER KEY
Subject Name: 615 ZOOLOGY
SI No. Key SI No. Key SI No. Key SI No. Key SI No. Key
1 C 31 B 61 B 91 C 121 A
2 A 32 A 62 B 92 D 122 B
3 D 33 B 63 B 93 A 123 D
4 B 34 B 64 A 94 D 124 C
5 A 35 A 65 A 95 B 125 C
6 B 36 B 66 C 96 A 126 D
7 A 37 D 67 C 97 C 127 D
8 B 38 B 68 B 98 A 128 D
9 C 39 C 69 A 99 B 129 A
10 D 40 B 70 C 100 D 130 C
11 C 41 C 71 C 101 A 131 A
12 B 42 A 72 A 102 A 132 B
13 B 43 A 73 A 103 A 133 B
14 C 44 B 74 B 104 B 134 B
15 D 45 D 75 B 105 C 135 D
16 A 46 A 76 C 106 D 136 D
17 B 47 C 77 C 107 B 137 A
18 A 48 B 78 B 108 A 138 B
19 C 49 C 79 C 109 A 139 A
20 B 50 A 80 C 110 B 140 C
21 B 51 A 81 A 111 A 141 A
22 D 52 D 82 A 112 C 142 B
23 A 53 D 83 C 113 C 143 A
24 A 54 B 84 D 114 B 144 A
25 C 55 C 85 A 115 B 145 C
26 D 56 A 86 C 116 A 146 C
27 B 57 A 87 B 117 C 147 B
28 B 58 B 88 A 118 B 148 C
29 C 59 A 89 D 119 D 149 C
30 B 60 B 90 A 120 B 150 D