NEET 2019 Question paper with Solutions- Biology

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NEET 2019 Question Paper with Solutions

Question 1

The Earth Summit held in Rio de Janeiro in 1992 was called

1. to reduce CO2 emissions and global warming
2. for conservation of biodiversity and sustainable utilization of its benefits
3. to assess threat posed to native species by invasive weed species
4. for immediate steps to discontinue use of CFCs that were damaging the ozone layer.

Correct answer: 2

Question 2

Colostrum the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the new born infants because it contains

1. Natural killer cells
2. Monocytes
3. Macrophages
4. Immunoglobulin A

Correct answer: 4

Question 3

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following

1. Closure of stomata
2. Flaccidity of bulliform cells
3. Shrinkage of air spaces in spongy mesophyll
4. Tyloses in vessels

Correct answer: 2

Question 4

The shorter and longer arms of a submetacentric chromosome are referred to as

1. s-arm and l-arm respectively
2. p-arm and q-arm respectively
3. q-arm and p-arm respectively
4. m-arm and n-arm respectively

Correct answer: 2

Question 5

Respiratory Quotient (RQ) value of tripalmitin is

1. 0.9
2. 0.7
3. 0.07
4. 0.09

Correct answer: 2

Question 6

Which of the following is a commercial blood cholesterol lowering agent?

1. Cyclosporin A
2. Statin
3. Streptokinase
4. Lipases

Correct answer: 2

Question 7

Match the following structures with their respective location in organs

Select correct option from the following

Correct answer: 3

Question 8

Which of the following is the most important cause for animals and plants being driven to extinction?

1. Habitat loss and fragmentation
2. Drought and floods
3. Economic exploitation
4. Alien species invasion

Correct answer: 1

Question 9

Which part of the brain is responsible for thermoregulation?

1. Cerebrum
2. Hypothalamus
3. Corpus callosum
4. Medulla oblongata

Correct answer: 2

Question 10

Consider following features

• Organ system level of organisation
• Bilateral symmetry
• True coelomates with segmentation of body

Select the correct option of animal groups which possess all the above characteristics

1. Annelida, Arthropoda and Chordata
2. Annelida, Arthropoda and Mollusca
3. Arthropoda, Mollusca and Chordata
4. Annelida, Mollusca and Chordata

Correct answer: 1

Question 11

Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth

1. Pharynx → Oesophagus → Crop → Gizzard → Ileum → Colon → Rectum

2. Pharynx → Oesophagus → Gizzard → Crop → Ileum → Colon → Rectum

3. Pharynx → Oesophagus → Gizzard → Ileum → Crop → Colon → Rectum

4. Pharynx → Oesophagus → Ileum → Crop → Gizzard → Colon → Rectum

Correct answer: 1

Question 12

Which of the following pairs of gases is mainly responsible for green house effect?

1. Ozone and Ammonia
2. Oxygen and Nitrogen
3. Nitrogen and Sulphur dioxide
4. Carbon dioxide and Methane

Correct answer: 4

Question 13

Which of the following muscular disorders is inherited?

1. Tetany
2. Muscular dystrophy
3. Myasthenia gravis
4. Botulism

Correct answer: 2

Question 14

The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in

1. Bile duct and Bronchioles
2. Fallopian tubes and Pancreatic duct
3. Eustachian tube and Salivary duct
4. Bronchioles and Fallopian tubes

Correct answer: 4

Question 15

Match the Column-I with Column-II

Select the correct option.

Correct answer: 1

Question 16

Which one of the following is not a method of in situ conservation of biodiversity?

1. Biosphere Reserve
2. Wildlife Sanctuary
3. Botanical Garden
4. Sacred Grove

Correct answer: 3

Question 17

In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weight from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

1. Directional Selection
2. Stabilizing Selection
3. Disruptive Selection
4. Cyclical Selection

Correct answer: 2

Question 18

The correct sequence of phases of cell cycle is

1. M → G₁ → G₂ → S
2. G₁ → G₂ → S → M
3. S → G₁ → G₂ → M
4. G₁ → S → G₂ → M

Correct answer: 4

Question 19

How does steroid hormone influence the cellular activities?

1. Changing the permeability of the cell membrane
2. Binding to DNA and forming a gene- hormone complex
3. Activating cyclic AMP located on the cell membrane
4. Using aquaporin channels as second messenger

Correct answer: 2

Question 20

Which of the following statements is not correct?

1. Lysosomes have numerous hydrolytic enzymes
2. The hydrolytic enzymes of lysosomes are active under acidic pH
3. Lysosomes    are    membrane     bound structures
4. Lysosomes are formed by the process of packaging in the endoplasmic reticulum

Correct answer: 4

Question 21

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

1. Ovary develops into fruit
2. Zygote develops into embryo
3. Central cell develops into endosperm
4. Ovules develop into embryo sac

Correct answer: 4

Question 22

Concanavalin A is

1. an alkaloid
2. an essential oil
3. a lectin
4. a pigment

Correct answer: 3

Question 23

Which one of the following equipments is essentially required for growing microbes on  a large scale, for industrial production of enzymes?

1. BOD incubator
2. Sludge digester
3. Industrial oven
4. Bioreactor

Correct answer: 4

Question 24

Consider the following statement:

(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.

(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.

Select the correct option.

1. Both (A) and (B) are true.
2. (A) is true but (B) is false.
3. Both (A) and (B) are false.
4. (A) is false but (B) is true.

Correct answer: 2

Question 25

Purines found both in DNA and RNA are

1. Adenine and thymine
2. Adenine and guanine
3. Guanine and cytosine
4. Cytosine and thymine

Correct answer: 2

Question 26

Select the correct sequence for transport of sperm cells in male reproductive system

1. Testis → Epididymis → Vasa efferentia → Rete testis → Inguinal canal → Urethra
2. Seminiferous tubules → Rete testis → Vasa efferentia → Epididymis → Vas deferens → Ejaculatory duct → Urethra → Urethral meatus
3. Seminiferous tubules → Vasa efferentia → Epididymis → Inguinal canal → Urethra
4. Testis → Epididymis → Vasa efferentia → Vas deferens → Ejaculatory duct → Inguinal canal → Urethra → Urethral meatus

Correct answer: 2

Question 27

Match the hominids with their correct brain size:

Select the correct option.

Correct answer: 3

Question 28

Variations caused by mutation, as proposed by Hugo de Vries are

1. random and directional
2. random and directionless
3. small and directional
4. small and directionless

Correct answer: 2

Question 29

Which of the following pair of organelles does not contain DNA?

1. Mitochondria and Lysosomes
2. Chloroplast and Vacuoles
3. Lysosomes and Vacuoles
4. Nuclear envelope and Mitochondria

Correct answer: 3

Lysosome and Vacuoles do not have DNA.

Question 30

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to

1. benign growth on mucous lining of nasal cavity
2. inflammation of bronchi and bronchioles
3. proliferation of fibrous tissues and damage of the alveolar walls
4. reduction in the secretion of surfactants by pneumocytes.

Correct answer: 2

Question 31

Select the incorrect statement.

1. Male fruit fly is heterogametic
2. In male grasshoppers 50% of sperms have no sex-chromosome
3. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg
4. Human males have one of their sex- chromosome much shorter than the other.

Correct answer: 3

Question 32

DNA precipitation out of a mixture of biomolecules can be achieved by treatment with

1. Isopropanol
2. Chilled ethanol
3. Methanol at room temperature
4. Chilled chloroform

Correct answer: 2

Question 33

Select the correct group of biocontrol agents.

1. Bacillus thuringiensis, Tobacco mosaic virus, Aphids
2. Trichoderma,     Baculovirus,    Bacillus thuringiensis
3. Oscillatoria, Rhizobium, Trichoderma
4. Nostoc, Azospirillium, Nucleopolyhedrovirus

Correct answer: 2

Question 34

Select the incorrect statement.

1. Inbreeding increases homozygosity

2. Inbreeding is essential to evolve purelines in any animal.

3. Inbreeding selects harmful recessive genes that reduce fertility and productivity

4. Inbreeding helps in accumulation of superior genes and elimination of undesirable genes

Correct answer: 3

Question 35

Match the following organisms with the products they produce

Select the correct option.

Correct answer: 2

Question 36

What is the direction of movement of sugars  in phloem?

1. Non-multidirectional
2. Upward
3. Downward
4. Bi-directional

Correct answer: 4

Question 37

In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as

1. Autogamy
2. Parthenocarpy
3. Syngamy
4. Parthenogenesis

Correct answer: 4

Question 38

Persistent nucellus in the seed is known as

1. Chalaza
2. Perisperm
3. Hilum
4. Tegmen

Correct answer: 2

Question 39

What map unit (Centimorgan) is adopted in the construction of genetic maps?

1. A unit of distance between two expressed genes representing 10% cross over.

2. A unit of distance between two expressed genes representing 100% cross over.

3. A unit of distance between genes on chromosomes, representing 1% cross over.

4. A unit of distance between genes on chromosomes, representing 50% cross over.

Correct answer: 3

Question 40

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

1. 50 beats per minute
2. 75 beats per minute
3. 100 beats per minute
4. 125 beats per minute

Correct answer: 3

Question 41

Thiobacillus is a group of bacteria helpful in carrying out

1. Nitrogen fixation
2. Chemoautotrophic fixation
3. Nitrification
4. Denitrification

Correct answer: 4

Question 42

Which of the following factors is responsible for the formation of concentrated urine?

1. Low levels of antidiuretic hormone
2. Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.
3. Secretion of erythropoietin by Juxtaglomerular complex
4. Hydrostatic pressure during glomerular filtration

Correct answer: 2

Question 43

Which of the following statements regarding mitochondria is incorrect?

1. Outer membrane is permeable to monomers of carbohydrates, fats and proteins.
2. Enzymes of electron transport are embedded in outer membrane.
3. Inner membrane is convoluted with infoldings.
4. Mitochondrial matrix contains single circular DNA molecule and ribosomes

Correct answer: 2

Question 44

Xylem translocates.

1. Water only

2. Water and mineral salts only

3. Water, mineral salts and some organic nitrogen only

4. Water, mineral salts, some organic nitrogen and hormones

Correct answer: 4

Question 45

Cell in G_o phase:

1. exit the cell cycle
2. enter the cell cycle
3. suspend the cell cycle
4. terminate the cell cycle

Correct answer: 1

Question 46

Which of the statements given below is not true about formation of Annual Rings in trees?

1. Annual ring is a combination of spring wood and autumn wood produced in a year
2. Differential activity of cambium causes light and dark bands of tissue early and late wood respectively.
3. Activity of cambium depends upon variation in climate.
4. Annual rings are not prominent in trees of temperate region

Correct answer: 4

Question 47

Which of the following ecological pyramids is generally inverted?

1. Pyramid of numbers in grassland

2. Pyramid of energy

3. Pyramid of biomass in a forest

4. Pyramid of biomass in a sea

Correct answer: 4

Question 48

Placentation in which ovules develop on the inner wall of the ovary or in peripheral part, is

1. Basal
2. Axile
3. Parietal
4. Free central

Correct answer: 3

Question 49

Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?

1. Montreal Protocol
2. Kyoto Protocol
3. Gothenburg Protocol
4. Geneva Protocol

Correct answer: 1

Question 50

Which of the following contraceptive methods do involve a role of hormone?

1. Lactational amenorrhea, Pills Emergency contraceptives.
2. Barrier method, Lactational amenorrhea, Pills.
3. CuT, Pills, Emergency contraceptives.
4. Pills, Emergency contraceptives, Barrier methods

Correct answer: 1

Question 51

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL, respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

1. 1500 mL
2. 1700 mL
3. 2200 mL
4. 2700 mL

Correct answer: 1

Question 52

What is the fate of the male gametes discharged in the synergid?

1. One fuses with egg other(s) degenerate(s) in the synergid.
2. All fuse with the egg.
3. One fuses with the egg, other(s) fuse(s) with synergid nucleus.
4. One fuses with the egg and other fuses with central cell nuclei.

Correct answer: 4

Question 53

What is the site of perception of photoperiod necessary for induction of flowering in plants?

1. Lateral buds
2. Pulvinus
3. Shoot apex
4. Leaves

Correct answer: 4

Question 54

Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus

1. Mangifera indica Car. Linn.

2. Mangifera indica Linn.

3. Mangifera indica

4. Mangifera Indica

Correct answer: 2

Question 55

Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement.

1. The enzyme cuts DNA  molecule atidentified position within the DNA.

2. The enzyme binds DNA at specific sites and cuts only one of the two strands.

3. The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.

4. The enzyme recognizes a specific palindromic nucleotide sequence in the DNA.

Correct answer: 2

Question 56

From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in

1. Liverworts
2. Mosses
3. Pteridophytes
4. Gymnosperms

Correct answer: 3

Question 57

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers. Choose the incorrect statement from the following:

1. This experiment does not follow the Principle of Dominance.
2. Pink color in F₁ is due to incomplete dominance.
3. Ratio of F₂ is 1/4 (Red) : 2/4 (Pink) : 1/ 4 (White)
4. Law of Segregation does not apply in this experiment

Correct answer: 4

Question 58

Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by

1. Aldolase
2. Hexokinase
3. Enolase
4. Phosphofructokinase

Correct answer: 2

Question 59

Drug called ‘Heroin’ is synthesized by

1. methylation of morphine
2. acetylation of morphine
3. glycosylation of morphine
4. nitration of morphine

Correct answer: 2

Question 60

Select the hormone-releasing Intra-Uterine Devices.

1. Vaults, LNG-20
2. Multiload 375, Progestasert
3. Progestasert, LNG-20
4. Lippes Loop, Multiload 375

Correct answer: 3

Question 61

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

1. 0.36(AA); 0.48(Aa); 0.16(aa)
2. 0.16(AA); 0.24(Aa); 0.36(aa)
3. 0.16(AA); 0.48(Aa); 0.36(aa)
4. 0.16(AA); 0.36(Aa); 0.48(aa)

Correct answer: 3

Question 62

Which of the following is true for Golden rice?

1. It is Vitamin A enriched, with a gene from daffodil

2. It is pest resistant, with a gene from Bacillus thuringiensis

3. It is drought tolerant, developed using Agrobacterium vector

4. It has yellow grains, because of a gene introduced from a primitive variety of rice

Correct answer: 1

Question 63

Pinus seed cannot germinate and established without fungal association. This is because:

1. its embryo is immature.
2. it has obligate association with mycorrhizae.
3. it has very hard seed coat.
4. its seeds contain inhibitors that present germination.

Correct answer: 2

Question 64

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

1. Genetic code is not ambiguous

2. Genetic code is redundant

3. Genetic code is nearly universal

4. Genetic code is specific

Correct answer: 3

Question 65

Which of the following sexually transmitted diseases is not completely curable?

1. Gonorrhoea
2. Genital warts
3. Genital herpes
4. Chlamydiasis

Correct answer: 3

Question 66

Which of the  following statements is incorrect?

1. Viroids lack a protein coat.
2. Viruses are obligate parasites.
3. Infective constituent in viruses is the protein coat.
4. Prions consist of abnormally folded proteins.

Correct answer: 3

Question 67

Match the following organisms with their respective characteristics:

Select the correct option from the following:

Correct answer: 2

Question 68

Expressed Sequence Tags (ESTs) refers to:

1. Genes expressed as RNA
2. Polypeptide expression
3. DNA polymorphism
4. Novel DNA sequences

Correct answer: 1

Question 69

Which is of the following statements is incorrect?

1. Morels and truffles are edible delicacies.
2. Claviceps is a source of many alkaloids and LSD.
3. Conidia are produced exogenously and ascospores endogenously.
4. Yeasts have filamentous bodies with long thread-like hyphae.

Correct answer: 4

Question 70

Match Column – I with Column – II

Choose the correct answer from the option given below

Correct answer: 4

Question 71

Which of the following glucose transporters is insulin-dependent?

1. GLUT I

2. GLUT II

3. GLUT III

4. GLUT IV

Correct answer: 4

Question 72

Which of the following immune responses is responsible for rejection of kidney graft?

1. Auto-immune response
2. Humoral immune response
3. Inflammatory immune response
4. Cell-mediated immune response

Correct answer: 4

Question 73

Use of an artificial kidney during hemodialysis may result in:

(a) Nitrogenous waste build-up in the body

(b) Non-elimination of excess potassium ions

(c) Reduced absorption of calcium ions from gastro-intestinal tract

(d) Reduced RBC production

Which of the following options is the most appropriate?

1. (a) and (b) are correct
2. (b) and (c) are correct
3. (c) and (d) are correct
4. (a) and (d) are correct

Correct answer: 3

Question 74

Which of the  following statements is correct?

1. Cornea is an external, transparent and protective proteinacious covering of the eye-ball.

2. Cornea consists of dense connective tissue of elastin and can repair itself.

3. Cornea is convex, transparent layer which is highly vascularised.

4. Cornea consists of dense matrix of collagen and is the most sensitive portion the eye.

Correct answer: 4

Question 75

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:

1. T.H. Morgan
2. Gregor J. Mendel
3. Alfred Sturtevant
4. Sutton Boveri

Correct answer: 3

Question 76

Match the following genes of the Lac operon with their respective products:

Correct answer: 3

Question 77

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Auxin and Ethylene
2. Gibberellin and Cytokinin
3. Gibberellin and Abscisic acid
4. Cytokinin and Abscisic acid

Correct answer: 1

Question 78

Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.

1. Chief Cells
2. Goblet Cells
3. Oxyntic Cells
4. Duodenal Cells

Correct answer: 2

Question 79

Which of the following can be used as a biocontrol agent in the treatment of plant disease?

1. Trichoderma
2. Chlorella
3. Anabaena
4. Lactobacillus

Correct answer: 1

Question 80

Phloem in gymnosperms lacks:

1. Albuminous cells and sieve cells
2. Sieve tubes only
3. Companion cells only
4. Both sieve tubes and companion cells

Correct answer: 4

Question 81

Extrusion of second polar body from egg nucleus occurs :

1. after entry of sperm but before fertilization
2. after fertilization
3. before entry of sperm into ovum
4. simultaneously with first cleavage

Correct answer: 1

Question 82

Under which of the following conditions will there be no change in the reading frame of following mRNA?

5’AACAGCGGUGCUAUU3′

1. Insertion of G at 5^th position
2. Deletion of G from 5^th position
3. Insertion of A and G at 4^th and 5^th positions respectively
4. Deletion of GGU from 7^th, 8^th and 9^th positions

Correct answer: 4

Question 83

The concept of “Omnis cellula-e cellula” regarding cell division was first proposed by

1. Rudolf Virchow
2. Theodor Schwann
3. Schleiden
4. Aristotle

Correct answer: 1

Question 84

What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?

1. Body temperature
2. Moist surface of midgut
3. Alkaline pH of gut
4. Acidic pH of stomach

Correct answer: 3

Question 85

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.

1. Plasmodium vivax / UTI test
2. Streptococcus pneumoniae / Widal test
3. Salmonella typhi / Anthrone test
4. Salmonella typhi / Widal test

Correct answer: 4

Question 86

What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile?

1. Turner’s syndrome
2. Klinefelter’s syndrome
3. Edward syndrome
4. Down’s syndrome

Correct answer: 2

Question 87

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for

1. Making plastic sacks
2. Use as a fertilizer
3. Construction of roads
4. Making tubes and pipes

Correct answer: 3

Question 88

Which of these following methods is the most suitable for disposal of nuclear waste?

1. Shoot the waste into space
2. Bury the waste under Antarctic ice-cover
3. Dump the waste within rocks under deep ocean
4. Bury the waste within rocks deep below the Earth’s surface

Correct answer: 4

Question 89

Match the following hormones with the respective disease

Correct answer: 3

Question 90

Select the correct option.

1. 8^th, 9^th and 10^th pairs of ribs articulate directly with the sternum.
2. 11^th and 12^th pairs of ribs are connected to the sternum with the help of hyaline cartilage.
3. Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.
4. There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

Correct answer: 4

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