NEET(UG)–2018 BIOLOGY Question paper with solutions

NEET(UG)–2018 TEST PAPER WITH ANSWER

(HELD ON SUNDAY 06th MAY, 2018)

91. The experimental proof for semiconservativereplication of DNA was first shown in a
(1) Fungus (2) Bacterium
(3) Plant (4) Virus
Ans. (2)

92. Select the correct statement :
(1) Franklin Stahl coined the term "linkage".
(2) Punnett square was developed by a Britishscientist.
(3) Spliceosomes take part in translation.
(4) Transduction was discovered by S. Altman.
Ans. (2)

93. Offsets are produced by
(1) Meiotic divisions (2) Mitotic divisions
(3) Parthenocarpy (4) Parthenogenesis
Ans. (2)

94. Which of the following pairs in wrongly matched ?
(1) Starch synthesis in pea : Multiple alleles
(2) ABO blood grouping : Co-dominance
(3) XO type sex determination : Grasshopper
(4) T.H. Morgan : Linkage
Ans. (1)

95. Which of the following flowers only once in its
life-time ?
(1) Bamboo species (2) Jackfruit
(3) Mango (4) Papaya
Ans. (1)

96. Select the correct match :
(1) Alec Jeffreys – Streptococcus
 pneumoniae
(2) Alfred Hershey and – TMV
Martha Chase
(3) Matthew Meselson – Pisum sativum
and F. Stahl
(4) Francois Jacob and – Lac operon
Jacques Monod
Ans. (4)

97. Which of the following has proved helpful in preserving pollen as fossils ?
(1) Pollenkitt (2) Cellulosic intine
(3) Oil content (4) Sporopollenin
Ans. (4)

98. Stomatal movement is not affected by
(1) Temperature (2) Light
(3) O2 concentration (4) CO2 concentration
Ans. (3)

99. The stage during which separation of the pairedvhomologous chromosomes begins is
(1) Pachytene (2) Diplotene
(3) Diakinesis (4) Zygotene
Ans. (2)

100. The two functional groups characteristic of sugars are
(1) hydroxyl and methyl
(2) carbonyl and methyl
(3) carbonyl and phosphate
(4) carbonyl and hydroxyl
Ans. (4)

101. Which of the following is not a product of light reaction of photosynthesis ?
(1) ATP (2) NADH
(3) NADPH (4) Oxygen
Ans. (2)

102. Stomata in grass leaf are
(1) Dumb-bell shaped (2) Kidney shaped
(3) Rectangular (4) Barrel shaped
Ans. (1)

103. Which among the following is not a prokaryote ?
(1) Saccharomyces (2) Mycobacterium
(3) Nostoc (4) Oscillatoria
Ans. (1)

104. Which of the following is true for nucleolus ?
(1) Larger nucleoli are present in dividing cells.
(2) It is a membrane-bound structure.
(3) It takes part in spindle formation.
(4) It is a site for active ribosomal RNA synthesis.

Ans. (4)

105. The Golgi complex participates in
(1) Fatty acid breakdown
(2) Formation of secretory vesicles
(3) Respiration in bacteria
(4) Activation of amino acid
Ans. (2)

106. In stratosphere, which of the following element acts
as a catalyst in degradation of ozone a release of
molecular oxygen ?
(1) Carbon (2) Cl
(3) Fe (4) Oxygen
Ans. (2)

107. Which of the following is a secondary pollutant
(1) CO (2) CO2
(3) SO2 (4) O3
Ans. (4)

108. Niche is
(1) all the biological factors in the organism
environment
(2) the physical space where an organism live
(3) the range of temperature that the organism
needs to live
(4) the functional role played by the organism
where it lives
Ans. (4)

109. Natality refers to
(1) Death rate
(2) Birth rate
(3) Number of individuals leaving the habitat
(4) Number of individuals entering ahabitat

Ans. (2)

110. What type of ecological pyramid would obtained
with the following data ?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
(1) Inverted pyramid of biomass
(2) Pyramid of energy
(3) Upright pyramid of numbers
(4) Upright pyramid of biomass
Ans. (1)

111. World Ozone Day is celebrated on
(1) 5th June (2) 21st April
(3) 16th September (4) 22nd April
Ans. (3)

112. Which of the following is commonly used as a vector
for introducing a DNA fragment in human
lymphocytes ?
(1) Retrovirus (2) Ti plasmid
(3)  phage (4) pBR 322
Ans. (1)

113. In India, the organisation responsible for assessing the safety of introducing genetically modified
organisms for public use is
(1) Indian Council of Medical Research(ICMR)
(2) Council for Scientific and Industrial Research(CSIR)
(3) Research Committee on Genetic Manipulation(RCGM)
(4) Genetic Engineering Appraisal Committee(GEAC)
Ans. (4)

114. A 'new variety of rice was patented by a foreign company though such varieties have been present in India for a long time. This is related to
(1) Co-667 (2) Sharbati Sonora
(3) Lerma Rojo (4) Basmati
Ans. (4)

115. Select the correct Match :
(1) Ribozyme - Nucleic acid
(2) F2 × Recessive parent - Dihybrid cross
(3) T.H. Morgan - Transduction
(4) G. Mendel - Transformation
Ans. (1)

116. Use of bioresources by multinational companies and organisations without authorisation from theconcerned country and its peoople is called
(1) Bio-infringement (2) Biopiracy
(3) Biodegradation (4) Bioexploitation
Ans. (2)

117. The correct order of steps in Polymerase Chain
Reaction (PCR) is
(1) Extension, Denaturation, Annealing
(2) Annealing, Extension, Denaturation
(3) Denaturation, Extension, Annealing
(4) Denaturation, Annealing, Extension
Ans. (4)

118. Secondary xylem and phloem in dicot stem are produced by
(1) Apical meristems (2) Vascular cambium
(3) Phellogen (4) Axillary meristems
Ans. (2

119. Pneumatophores occur in
(1) Halophytes
(2) Free-floating hydrophytes
(3) Carnivorous plants
(4) Submerged hydrophytes
Ans. (1)

120. Sweet potato is a modified
(1) Stem (2) Adventitious root
(3) Tap root (4) Rhizome
Ans. (2)

121. Which of the following statement is correct ?
(1) Ovules are not enclosed by ovary wall in
gymnosperms
(2) Selaginella is heterosporous, while Salvinia is homosporous
(3) Horsetails are gymnosperms
(4) Stems are usually unbranched in both Cycasand Cedrus
Ans. (1)

122. Select the wrong statement :
(1) Cell wall is present in members of Fungi and
Plantae
(2) Mushrooms belong to Basidiomycetes
(3) Pseudopodia are locomotory and feeding
structures in Sporozoans
(4) Mitochondria are the powerhouse of the cell
in all kingdoms except Monera
Ans. (3)

123. Casparian strips occur in
(1) Epidermis (2) Pericycle
(3) Cortex (4) Endodermis
Ans. (4)

124. Plants having little or no secondary growth are
(1) Grasses
(2) Deciduous angiosperms
(3) Conifers
(4) Cycads
Ans. (1)

125. Which one is wrongly matched ?
(1) Uniflagellate gametes - Polysiphonia
(2) Biflagellate zoospores - Brown algae
(3) Gemma cups - Marchantia
(4) Unicellular organism - Chlorella
Ans. (1)

127. Winged pollen grains are present in
(1) Mustard (2) Cycas
(3) Mango (4) Pinus
Ans. (4)

128. After karyogamy followed by meiosis, spores are
produced exogenously in
(1) Neurospora (2) Alternaria
(3) Agaricus (4) Saccharomyces
Ans. (3)

129. What is the role of NAD+ in cellular respiration ?
(1) It functions as an enzymes
(2) It functions as an electron carrier
(3) It is a nucleotide source for ATP synthesis
(4) It is the final electron acceptor for anaerobic
respiration
Ans. (2)

130. Oxygen is not produced during photosynthesis by
(1) Green sulphur bacteria
(2) Nostoc
(3) Cycas
(4) Chara
Ans. (1)

131. Pollen grains can be stored for several years in liquid
nitrogen having a temperature of
(1) –120°C (2) –80°C
(3) –196°C (4) –160°C
Ans. (3)

132. In which of the following forms is iron absorbed
by plants ?
(1) Ferric
(2) Ferrous
(3) Free element
(4) Both ferric and ferrous
Ans. (1)

133. Double fertilization is
(1) Fusion of two male gametes of a pollen tube with two different eggs
(2) Fusion of one male gamete with two polar nuclei
(3) Fusion of two male gametes with one egg
(4) Syngamy and triple fusion
Ans. (4)

134. Which of the following elements is responsible for
maintaining turgor in cells ?
(1) Magnesium (2) Sodium
(3) Potassium (4) Calcium
Ans. (3)

135. Which one of the following plants shows a very
close relationship with a species of moth, where
none of the two can complete its life cycle without
the other?
(1) Hydrilla (2) Yucca
(3) Banana (4) Viola
Ans. (2)

136. Hormones secreted by the placenta to maintain
pregnancy are
(1) hCG, hPL, progestogens, prolactin
(2) hCG, hPL, estrogens, relaxin, oxytocin
(3) hCG, hPL, progestogens, estrogens
(4) hCG, progestogens, estrogens, glucocorticoids
Ans. (3)

137. The contraceptive 'SAHELI'
(1) blocks estrogen receptors in the uterus,
preventing eggs from getting implanted.
(2) increases the concentration of estrogen and prevents ovulation in females.
(3) is an lUD.
(4) is a post-coital contraceptive.
Ans. (1)

138. The difference between spermiogenesis and
spermiation is
(1) In spermiogenesis spermatids are formed, while
in spermiation spermatozoa are formed.
(2) In spermiogenesis spermatozoa are formed,
while in spermiation spermatids are formed.
(3) In spermiogenesis spermatozoa from Sertoli
cells are released into the cavity of seminiferous
tubules, while in spermiation spermatozoa areformed.
(4) In spermiogenesis spermatozoa are formed,while in spermiation spermatozoa arereleased
from Sertoli cells into the cavity ofseminiferous
tubules.
Ans. (4)

139. The amnion of mammalian embryo is derived from
(1) ectoderm and mesoderm
(2) endoderm and mesoderm
(3) mesoderm and trophoblast
(4) ectoderm and endoderm
Ans. (1)

140. In a growing population of a country
(1) pre-reproductive individuals are more than the
reproductive individuals.
(1) reproductive individuals are less than the post-
reproductive individuals.
(3) reproductive and pre-reproductive individuals
are equal in number.
(4) pre-reproductive individuals are less than the
reproductive individuals.
Ans. (1)

141. All of the following are included in 'Ex-situ
conservation' except
(1) Wildlife safari parks (2) Sacred groves
(3) Botanical gardens (4) Seed banks
Ans. (2)

142. Which part of poppy plant is used to obtain the
drug. "Smack" ?
(1) Flowers (2) Latex
(3) Roots (4) Leaves
Ans. (2


Which one of the following population interactions
is widely used in medical science for the production
of antibiotics ?
(1) Commensalism (2) Mutualism
(3) Parasitism (4) Amensalism
Ans. (4)

145. Which of the following events does not occur in
rough endoplasmic reticulum ?
(1) Protein folding
(2) Protein glycosylation
(3) Cleavage of signal peptide
(4) Phospholipid synthesis
Ans. (4)

146. Which of these statements is incorrect ?
(1) Enzymes of TCA cycle are present in
mitochondrial matrix.
(2) Glycolysis occurs in cytosol.
(3) Glycolysis operates as long as it is supplied with
NAD that can pick up hydrogen atoms.
(4) Oxidative phosphorylation takes place in outer mitochondrial membrane.
Ans. (4)
147. Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are
termed as
(1) Polysome
(2) Polyhedral bodies
(3) Plastidome
(4) Nucleosome
Ans. (1)

148. Select the incorrect match :
(1) Lampbrush – Diplotene bivalents
chromosomes
(2) Allosomes – Sex chromosomes
(3) Submetacentric – L-shaped chromososmes
chromosomes
(4) Polytene – Oocytes of amphibians
chromosomes
Ans. (4)

149. Nissl bodies are mainly composed of
(1) Proteins and lipids
(2) DNA and RNA
(3) Nucleic acids and SER
(4) Free ribosomes and RER
Ans. (4)

150. Which of the following terms describe human
dentition ?
(1) Thecodont, Diphyodont, Homodont
(2) Thecodont, Diphyodont, Heterodont
(3) Pleurodont, Monophyodont, Homodont
(4) Pleurodont, Diphyodont, Heterodont

The similarity of bone structure in the forelimbs of
many vertebrates is an example of
(1) Homology (2) Analogy
(3) Convergent evolution (4) Adaptive radiation
Ans. (1)

154. Which of the following is not at autoimmune
disease?
(1) Psoriasis (2) Rheumatoid arthritis
(3) Alzheimer's disease (4) Vitiligo
Ans. (3)

155. Among the following sets of examples for divergent
evolution, select the incorrect option :
(1) Forelimbs of man, bat and cheetah
(2) Heart of bat, man and cheetah
(3) Brain of bat, man and cheetah
(4) Eye of octopus, bat and man
Ans. (4)

156. Which of the following characteristics represent
'Inheritance of blood groups' in humans ?
a. Dominance
b. Co-dominance
c. Multiple dominance
d. Incomplete dominance
e. Polygenic inheritance
(1) b, c and e (2) a, b and c
(3) b, d and e (4) a, c and e
Ans. (2)
157. In which disease does mosquito transmitted pathogen
cause chronic inflammation of lymphatic vessels?
(1) Elephantiasis (2) Ascariasis
(3) Ringworm disease (4) Amoebiasis
Ans. (1)
158. Conversion of milk to curd improves its nutritional
value by increasing the amount of
(1) Vitamin D (2) Vitamin A
(3) Vitamin B12 (4) Vitamin E
Ans. (3)
159. Which of the following is an amino acid derived
hormone ?
(1) Epinephrine (2) Ecdysone
(3) Estradiol (4) Estriol
Ans. (1)


Which of the following hormones can play a
significant role in osteoporesis ?
(1) Aldosterone and Prolactin
(2) Progesterone and Aldosterone
(3) Estrogen and Parathyroid hormone
(4) Parathyroid hormone and Prolactin
Ans. (3)
162. The transparent lens in the human eye is held in
its place by
(1) ligaments attached to the ciliary body
(2) ligaments attached to the iris
(3) smooth muscles attached to the iris
(4) smooth muscles attached to the ciliary body
Ans. (1)
163. Which of the following animals does not undergo
metamorphosis ?
(1) Earthworm (2) Tunicate
(3) Moth (4) Starfish
Ans. (1)
164. Identify the vertebrate group of animals
characterized by crop and gizzard in its digestive
sytstem.
(1) Amphibia (2) Reptilia
(3) Aves (4) Osteichthyes
Ans. (3)
165. Which of the following organisms are known as
chief producers in the oceans ?
(1) Dinoflagellates (2) Diatoms
(3) Cyanobacteria (4) Euglenoids
Ans. (2)
166. Which one of these animals is not a homeotherm?
(1) Macropus (2) Chelone
(3) Camelus (4) Psittacula
Ans. (2)
167. Ciliates differ from all other protozoans in
(1) using flagella for locomotion
(2) having a contractile vacuole for removing excess
water
(3) using pseudopodia for capturing prey
(4) having two types of nuclei
Ans. (4)
168. Which of the following features is used to identify
a male cockroach from a female cockroach ?
(1) Presence of a boat shaped sternum on the 9th
abdominal segment
(2) Presence of caudal styles
(3) Forewings with darker tegmina
(4) Presence of anal cerci
Ans. (2)
169. Which of the following options correctly represents
the lung conditions in asthma and emphysema,
respectively ?
(1) Inflammation of bronchioles; Decreased
respiratory surface
(2) Increased number of bronchioles; Increased
respiratory surface
(3) Increased respiratory surface; Inflammation of
bronchioles
(4) Decreased respiratory surface; Inflammation of
bronchioles
Ans. (1)

173. According to Hugo de Vries, the mechanism of
evolution is :-
(1) Multiple step mutations
(2) Saltation
(3) Phenotypic variations
(4) Minor mutations
Ans. (2)

175. A woman has an X-linked condition on one of her
X chromosomes. This chromosome can be
inherited by :-
(1) Only daughters
(2) Only sons
(3) Only grandchildren
(4) Both sons and daughters
Ans. (4)
176. All of the following are part of an operon
except :-
(1) an operator (2) structural genes
(3) an enhancer (4) a promoter
Ans. (3)
177. Which of the following gastric cells indirectly help
in erythropoiesis ?
(1) Chief cells (2) Mucous cells
(3) Goblet cells (4) Parietal cells
Ans. (4)

179. Calcium is important in skeletal muscle contraction
because it :-
(1) binds to troponin to remove the masking of
active sites on actin for myosin.
(2) activates the myosin ATPase by binding to it.
(3) detaches the myosin head from the actin
filament.
(4) prevents the formation of bonds between the
myosin cross bridges and the actin filament.
Ans. (1)
180. Which of the following is an occupational
respiratory disorder ? :
(1) Anthracis (2) Silicosis
(3) Botulism (4) Emphysema
Ans. (2)