MCQ’S  FOR NEET

101. What would be the number of chromosomes in the cells of the aleurone layer in a plant

species with 8chromosomes in its synergids ?

1) 16

2) 24

3) 32

4) 8

102. Pineapple (annanas) fruit develops from :

1) a unilocular polycarpillary flower

2) a multipistillate syncarpous flower

3) a cluster of compactly borne flowers on a common axis

4) a multilocular monocarpillary flower

103. Golden rice is a promising transgenic crop. When released for cultivation, it will help in :

1) alleviation of vitamin-A deficiency

2) pest resistance

3) herbicide tolerance

4) producing a petrol-like fuel from rice

104. Parthenocarpic tomato fruits can be produced by :

1) removing androecium of flowers before pollen grains are released

2) treating the plants with low concentrations of gibberellic acid and auxins

3) raising the plants from vernalized seeds

4) treating the plants with phenylmercuric acetate

105. How does pruning help in making the hedge dense ?

1) It induces the differentiation of new shoots from the rootstock

2) It frees axillary buds from apical dominance

3) The apical shoot grows faster after pruning

4) It releases wound hormones

106. The 'blue baby' syndrome results from :

1) excess fo chloride

2) methaemoglobin

3) excess of dissolved oxygen

4) excess of TDS (Total Dissolved Solids)

107. Praying mentis is a good example of :

1) mullerian mimicry

2) warning colouration

3) social insects

4) camouflage

108. Which one of the following statements is correct ?

1) Neurons regulate endocrine activity, but not vice versa

2) Endocrine glands regulate neural activity and nervous system regulates endocrine

glands

3) Neither hormones control neural activity nor the neurons control endocrine activity

4) Endocrine glands regulate neural activity, but not vice versa

109. Examination of blood of a person suspected of having anaemia, shows large, immature,

nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the

following, is likely to alleviate his symptoms ?

1) Thiamine

2) Folic acid and cobalamine

3) Riboflavin

4) Iron compounds

110. Farmers in a particular region were concerned that pre-mature yellowing of leaves of a

pulse crop might cause decrease in the yield.Which treatment could be most beneficial to

obtain maximum seed yield ?

1) Frequent irrigation of the crop

2) Treatment of the paints with cytokinins along with a small dose of nitrogenous fertilizer

3) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-

trichlorophenoxy acetic acid

4) Application of iron and magnesium to promote synthesis of chlorophyll

111. In which of the following fruits is the edible part the aril ?

1) Custard apple

2) Pomegranate

3) Orange

4) Litchi

112. Which one of the following aminoacids was not found to be synthesized in Miller's

experiment ?

1) Glycine

2) Aspartic acid

3) Glutamic acid

4) Alanine

113. Crop plants grown in monoculture are :

1) low in yield

2) free from intraspecific competition

3) characterised by poor root system

4) highly prone to pests

114. Montreal protocol which calls for appropriate action to protect the ozone layer from

human activities was passed in the year :

1) 1986

2) 1987

3) 1988

4) 1985

115. The formula for exponential population growth is :

1) dt/dN = rN

2) dN/rN = dt

3) rN/dN = dt

4) dN/dt = rN

116. Which one of the following is not used for construction of ecological pyramids ?

1) Dry weight

2) Number of individuals

3) Rate of energy flow

4) Fresh weight

117. Niche overlap indicates :

1) active co-operation between two species

2) two different parasites on the same host

3) sharing of one ormore resources between the two species

4) mutualism between two species

118. In photosystem-I, the first electron acceptor is :

1) ferredoxin

2) cytochrome

3) plastocyanin

4) an iron-sulphur protein

119. Treatment of seed at low temperature undermoist conditions to break its dormancy is

called :

1) scarification

2) vernalization

3) chelation

4) stratification

120. Which one of the following is the most suitable, medium for culture of Drosophila

melanogaster ?

1) Moist bread

2) Agar agar

3) Ripe banana

4) Cow dung

121. Which one of the following is not included under in situ conservation ?

1) Sanctuary

2) Botanical garden

3) Biosphere reserve

4) National park

122. Which antibiotic inhibits interaction between t-RNA and m-RNA during bacterial protein

synthesis ?

1) Erythromycin

2) Neomycin

3) Streptomycin

4) Tetracycline

123. Phenotype of an organism is the result of :

1) mutations and linkages

2) cytoplasmic effects and nutrition

3) environmental changes and sexual dimorphism

4) genotype and environment interactions

124. Photochemical smog pollution does not contain :

1) ozone

2) nitrogen dioxide

3) carbon dioxide

4) PAN (Peroxy Acyl Nitrate)

125. Moss peat is used as a packing material for sending flowers and live plants to distant

places because :

1) it is easily available

2) it is hygroscopic

3) it reduces transpiration

4) it serves as a disinfectant

126. A common structural feature of vessel elements and sieve tube elements is :

1) thick secondary walls

2) pores on lateral walls

3) presence of P-protein

4) enucleate condition

127. The thalloid body of a slime mould (Myxomycetes) is known as :

1) protonema

2) Plasmodium

3) fruiting body

4) mycelium

128. In which mode of inheritance do you expect more maternal influence among the off

spring ?

1) Autosomal

2) Cytoplasmic

3) Y-linked

4) X-linked

129. What type of placentation is seen in sweet pea ?

1) Basal

2) Axile

3) Free central

4) Marginal

130. Long filamentous threads protruding at the end of a young cob of maize are :

1) anthers

2) styles

3) ovaries

4) hairs

131. Conifers differ from grasses in the :

1) production of seeds from ovules

2) lack of xylem tracheids

3) absence of pollen tubes

4) formation of endosperm before fertilization

132. How many different kinds of gametes will be produced by a plant having the genotype

AABbCC ?

1) Three

2) Four

3) Nine

4) Two

133. In maize, hybrid vigour is exploited by :

1) bombarding the protoplast with DNA

2) crossing of two inbreed parental lines

3) harvesting seeds from the most productive plants

4) inducing mutations

134. Which of the following statements regarding mitochondrial membrane is not correct ?

1) The outer membrane is permeable to all kinds of molecules

2) The enzymes of the electron transfer chain are embedded in the outer membrane

3) The inner membrane is highly convoluted forming a series of infoldings

4) The outer membrane resembles a sieve

135. Amino acid sequence, in protein synthesis is decided by the sequence of :

1) t-RNA

2) m-RNA

3) c-DNA

4) r-RNA

136. How many ATP molecules could maximally be generated from one molecule of glucose, if

the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the

useful chemical energy available in the high energy phosphate bond of one mole of ATP

is 12 kcal ?

1) Two

2) Thirty

3) Fifty seven

4) One

137. An organic substance bound to an enzyme and essential for its acvity is called :

1) coenzyme

2) holoenzyme

3) apoenzyme

4) isoenzyme

138. Bowman's glands are found in :

1) olfactory epithelium

2) external auditory canal

3) cortical nephrons only

4) juxtamedullary nephrons

139. The bacterium (Clostridium botulinum) that causes botulism is :

1) a facultative anaerobe

2) an obligate anaerobe

3) a facultative aerobe

4) an obligate aerobe

140. Which one of the following is the correctly matched pair of an endangered animal and a National Park ?

1) Lion — Corbett National Park

2) Rhinoceros — Kaziranga National Park

3) Wild ass — Dudhwa National Park

4) Great Indian bustard —Keoladeo National Park

141. A person showing upredictable moods, outbursts of emotion, quarrelsome behaviour and

conflicts with others is suffering from :

1) schizophrenia

2) borderline personality disorder (BPD)

3) mood disorders

4) addictive disorders

142. Sulphur is an important nutrient for optimum growth and productivity in :

1) pulse crops

2) cereals

3) fibre crops

4) oilseed crops

143. Pentamerous, actinomorphic flowers, bicarpillary ovary with oblique septa, and fruit a

capsule or berry, are characteristic features of :

1) Asteraceae

2) Brassicaceae

3) Solanaceae

4) Liliaceae

144. In a moss the sporophyte :

1) is partially parasitic on the gametophyte

2) produces gametes that give rise to the gametophyte

3) arises from a spore produced from the gametophyte

4) manufactures food for itself, as well as for the gametophyte

145. Curing of tea leaves is brought about by the activity of :

1) bacteria

2) mycorrhiza

3) viruses

4) fungi

146. People living at sea level have around 5 million RBC per cubic millimeter of their blood

whereas those living at an altitude of 5400 metres have around 8 million. This is because

at high altitude :

1) people get pollution-free air to breathe and more oxygen is available

2) atmospheric O2 level is less and hence more RBCs are needed to absorb the required

amount of O2 to survive

3) there is more UV radiation which enhances RBC production

4) people eat more nutritive food, therefore more RBCs are formed

147. An important evidence in favour of organic evolution is the occurrence of :

1) homologous and vestigial organs

2) analogous and vestigial organs

3) homologous organs only

4) homologous and analogous organs

148. Which one of the following is not a living fossil ?

1) King crab

2) Sphenodon

3) Archaeopteryx

4) Peripatus

149. Annual migration does not occur in the case of :

1) salmon

2) Siberian crane

3) salamander

4) arctic tern

150. A major breakthrough in the studies of cells came with the development of electron

microscope. This is because :

1) the resolution power of the electron microscope is much higher than that of the light

microscope

2) the resolving power of the electron microscope is 200 – 350 nm as compared to 0.1 –

0.2 nm for the light microscope

3) electron beam can pass through thick materials, whereas light microscopy requires

thin sections

4) the electron microscope is more powerful than the light microscope as it uses a beam

of electrons which has wavelength much longer than that of photons

151. Which one of the following is a matching set of a phylum and its three examples ?

1) Cnidaria — Bonellia, Physalia, Aurelia

2) Platyhelminthes — Planaria, Schistosoma, Enterobius

3) Mollusca — Loligo, Teredo, Octopus

4) Porifera — Spongilla, Euplectella, pennatula

152. Metameric segmentation is the characteristic of :

1) Platyhelminthes and Arthropoda

2) Echinodermata and Annelida

3) Annelida and Arthropoda

4) Mollusca and Chordata

153. Which of the following pairs of an animal and a plant represents endangered organisms

in India ?

1) Bentinckia nicobarica and red panda

2) Tamarind and rhesus monkey

3) Cinchona and leopard

4) Banyan and black buck

154. Jurassic period of the Mesozoic era is characterised by :

1) gymnosperms are dominant plants and first birds appear

2) radiation of reptiles and origin ofmammal like reptiles

3) dinosaurs become extinct and angiosperms appear

4) flowering plants and first dinosaurs appear

155. What is common about Trypanosoma, Noctiluca, Monocystis and Giardia ?

1) These are all unicellular protists

2) They have flagella

3) They produce spores

4) These are all parasites

156. Which of the following statements regarding cilia is not correct ?

1) The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane

2) Cilia are hair-like cellular appendages

3) Microtubules of cilia are composed of tubulin

4) Cilia contain an outer ring of nine doublet microtubules surrounding two single

microtubules

157. Microbes found to be very useful in genetic engineering are :

1) Escherichia coli and Agrobacterium tumefaciens

2) Vibrio cholerae and a tailed bacteriophage

3) Diplococcus sp. and Pseudomonas sp.

4) Crown gall bacterium and Caenorhabditis elegans

158. Which of the following environmental conditions are essential for optimum growth of

Mucor on a piece of bread ?

A. Temperature of about 25°C

B. Temperature of about 5°C

C. Relative humidity of about 5%

D. Relative humidity of about 95%

E. A shady place

F. A brightly illuminated place

Choose the answer from the following options :

1) A, C and E only

2) A, D and E only

3) B, D and E only

4) B, C and F only

159. Evolutionary history of an organism is known as :

1) Phylogeny

2) Ancestry

3) Paleontology

4) Ontogeny

160. Which of the following is considered a hot-spot of biodiversity in India ?

1) Western ghats

2) Indo-Gangetic plain

3) Eastern ghats

4) Aravalli hills

161. During photorespiration, the oxygen consuming reaction(s) occur in :

1) stroma of chloroplasts and mitochondria

2) stroma of chloroplasts and peroxisomes

3) grana of chloroplasts and peroxisomes

4) stroma of chloroplasts

162. Which one of the following is an example of polygenic inheritance ?

1) Flower colour in Mirabilis jalapa

2) Production of male honey bee

3) Pod shape in garden pea

4) Skin colour in humans

163. Which one of the following not act as a neurotransmitter ?

1) Acetylcholine

2) Epinephrine

3) Nor epinephrine

4) Cortisone

164. Sertoli cells are regulated by the pituitary hormone known as :

1) FSH

2) GH

3) Prolactin

4) LH

165. A steroid hormone which regulates glucose metabolism is :

1) cortisol

2) corticosterone

3) 11-deoxycorticosterone

4) cortisone

166. The contractile protein of skeletal muscle involving ATPase activity is :

1) tropomyosin

2) myosin

3) α-actinin

4) troponin

167. Which one of the following is not a second messenger in hormone action ?

1) cGMP

2) Calcium

3) Sodium

4) cAMP

168. In Mendel's experiments with garden pea, round seed shape (RR) was dominant over

wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy).What  are the expected phenotypes in the F 2 generation of the cross RRYY x rryy ?

1) Only round seeds with green cotyledons

2) Only wrinkled seeds with yellow cotyledons

3) Only wrinkled seeds with green cotyledons

4) Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons

169. One gene – one enzyme hypothesis was postulated by :

1) R. Franklin

2) Hershey and Chase

3) A. Garrod

4) Beadle and Tatum

170. One turn of the helix in a B-form DNA is approximately :

1) 20 nm

2) 0.34 nm

3) 3.4 nm

4) 2 nm

171. Test cross involves :

1) crossing between two genotypes with recessive trait

2) crossing between two F 1 hybrids

3) crossing the F 1 hybrid with a double recessive genotype

4) crossing between two genotypes with dominant trait

172. Antiparallel strands of a DNA molecule means that :

1) one strand turns anti-clockwise

2) the phosphate groups of two DNA strands, at their ends, share the same position

3) the phosphate groups at thestart of two DNA strands are in opposite position (pole)

4) one strand turns clockwise

173. Areolar connective tissue joins :

1) fat body with muscles

2) integument with muscles

3) bones with muscles

4) bones with bones

174. Mast cells secrete :

1) hippurin

2) myoglobin

3) histamine

4) haemoglobin

175. If a colourblind woman marries a normal visioned man, their sons will be :

1) all normal visioned

2) one-half colourblind and one-half normal

3) three-fourths colourbling and one-fourth normal

4) all colourblind

176. Cri-du-chat syndrome in humans is caused by the :

1) fertilization of an XX egg by a normal Y-bearing sperm

2) loss of half of the short arm of chromosome 5

3) loss of half of the long arm of chromosome 5

4) trisomy of 21st chromosome

177. Restriction endonuclease :

1) cuts the DNA molecule randomly

2) cuts the DNA molecule at specific sites

3) restricts the synthesis of DNA inside the nucleus

4) synthesizes DNA

178. Antibodies in our body are complex :

1) lipoproteins

2) steroids

3) prostaglandins

4) glycoproteins

179. Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial

and municipal waste water into natural surface water, is :

1) < 3.0 ppm

2) < 10 ppm

3) < 100 ppm

4) < 30 ppm

180. Earthworms are :

1) ureotelic when plenty of water is available

2) uricotelic when plenty of water is available

3) uricotelic under conditions of water scarcity

4) ammonotelic when plenty of water is available

181. Which of the following is an accumulation and release centre of neurohormones ?

1) Posterior pituitary lobe

2) Intermediate lobe of the pituitary

3) Hypothalamus

4) Anterior pituitary lobe

182. Withdrawal of which of the following hormones is the immediate cause of menstruation ?

1) Eastrogens

2) FSH

3) FSH-RH

4) Progesterone

183. Which one of the following statements is incorrect ?

1) The residual air in lungs slightly decreases the efficiency of respiration in mammals

2) The presence of non-respiratory air sacs, increases the efficiency of respiration in

birds

3) In insects, circulating body fluids serve to distribute oxygen to tissues

4) The principle of countercurrent flow facilitates efficient respiration in gills of fishes

184. Which one of the following has an open circulatory system ?

1) Pheretima

2) Periplaneta

3) Hirudinaria

4) Octopus

185. Which hormone causes dilation of blood vessels, increased oxygen consumption and

glycogenolysis ?

1) ACTH

2) Insulin

3) Adrenalin

4) Glucagon

186. The causative agent ofmad-cow disease is a :

1) bacterium

2) prion

3) worm

4) virus

187. The translocation of organic solutes in sieve tube members is supported by :

1) root pressure and transpiration pull

2) P-proteins

3) mass flow involving a carrier and ATP

4) cytoplasmic streaming

188. Biradial symmetry and lack of cnidoblasts are the characteristics of :

1) Starfish and sea anemone

2) Ctenoplana and Beroe

3) Aurelia and Paramecium

4) Hydra and starfish

189. The arrangement of the nuclei in a normal embryo sac in the dicot plants is :

1) 2 + 4 + 2

2) 3 + 2 + 3

3) 2 + 3 + 3

4) 3 + 3 + 2

190. An enzyme that can stimulate germination of barley seeds is :

1) α-amylase

2) lipase

3) protease

4) invertase

191. In a cereal grain the single cotyledon of embryo is represented by :

1) coleorhiza

2) scutellum

3) prophyll

4) coleoptile

192. The majority of carbon dioxide produced by our body cells is transported to the lungs :

1) dissolved in the blood

2) as bircarbonates

3) as carbonates

4) attached to haemoglobin

193. Triticale, the first man-made cereal crop, has been obtained by crossing wheat with :

1) rye

2) pearl millet

3) sugarcane

4) barley

194. In order to obtain virus-free plants through tissue culture the best method is :

1) protoplast culture

2) embryo rescue

3) anther culture

4) meristem culture

195. HIV that causes AIDS, first starts destroying :

1) B-lymphocytes

2) leucocytes

3) thrombocytes

4) helper T-lymphocytes

196. In which one of the following sets of animals do all the four give birth to young ones ?

1) Lion, bat, whale, ostrich

2) Platypus, penguin, bat, hippopotamus

3) Shrew, bat, cat, kiwi

4) Kangaroo, hedgehog, dolphin, loris

197. Sickle cell anaemia has not been eliminated from the African population because :

1) it is controlled by recessive genes

2) it is not a fatal disease

3) it provides immunity against malaria

4) it is controlled by dominant genes

198. Two common characters found in centipede, cockroach and crab are :

1) compound eyes and anal cerci

2) jointed legs and chitinous exoskeleton

3) green gland and tracheae

4) book lungs and antennae

199. Both sickle cell anaemia and Huntington's chorea are :

1) bacteria-related diseases

2) congenital disorders

3) pollutant-induced disorders

4) virus-related diseases

200. Angiotensinogen is a protein produced and secreted by :

1) macula densa cells

2) endothelial cells (cells lining the blood vessels)

3) liver cells

4) juxtaglomerular (JG) cells