NTA - NEET Exam 2019

1.

Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus:
1. Mangifera Indica
2. Mangifera indica Car. Linn.
3. Mangifera indica Linn.
4. Mangifera indica

2.

Which of the following statements is incorrect?

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

3.

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

4.

Pinus seed cannot germinate and establish without fungal association. This is because:
1. its seeds contain inhibitors that prevent germination.
2. its embryo is immature.
3. it has obligate association with mycorrhizae.
4. it has very hard seed coat.

5.

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. Gymnosperms
2. Liverworts
3. Mosses
4. Pteridophytes

6.

Consider the following features:
(a) Organ system level of organization
(b) Bilateral symmetry
(c) True coelomates with the segmentation of the body
Select the correct option of animal groups that possess all the above characteristics.
1. Annelida, Mollusca and Chordata
2. Annelida, Arthropoda, and Chordata
3. Annelida, Arthropoda, and Mollusca
4. Arthropoda, Mollusca, and Chordata

7.

Match the following organism with their respective characteristics:

(a)	Pila	(i)	Flame cells
(b)	Bombyx	(ii)	Comb plates
(c)	Pleurobrachia	(iii)	Radula
(d)	Taenia	(iv)	Malpighian tubules

Select the correct option from the following:

	(a)	(b)	(c)	(d)
1.	(iii)	(ii)	(iv)	(i)
2.	(iii)	(ii)	(i)	(iv)
3.	(iii)	(iv)	(ii)	(i)
4.	(ii)	(iv)	(iii)	(i)

8.

Placentation, in which ovules develop on the inner wall of the ovary or in the peripheral part, is:
1. Free central
2. basal
3. Axile
4. Parietal

9.

Persistent nucellus in the seed is known as:
1. Tegmen
2. Chalaza
3. Perisperm
4. Hilum

10.

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :
1. Tyloses in vessels
2. Closure of stomata
3. Flaccidity of bulliform cells
4. Shrinkage of air spaces in spongy mesophyll

11.

Phloem in gymnosperms lacks:
1. Both sieve tubes and companion cells
2. Albuminous cells and sieve cells
3. Sieve tubes only
4. Companion cells only

12.

Which of the statements given below is not true about the formation of annual rings in trees?
1. Annual rings are not prominent in the trees of temperate regions.
2. Annual rings are a combination of spring wood and autumn wood produced in a year.
3. Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively.
4. Activity of cambium depends upon the variation in climate.

13.

The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in:
1. Bronchioles and fallopian tubes
2. Bile duct and bronchioles
3. Fallopian tubes and pancreatic duct
4. Eustachian tube and salivary duct

14.

Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth:
1. Pharynx $\to$ Oesophagus $\to$ Ileum $\to$ Crop $\to$ Gizzard $\to$ Colon $\to$ Rectum
2. Pharynx $\to$ Oesophagus $\to$ Crop $\to$ Gizzard $\to$ Ileum $\to$ Colon $\to$ Rectum
3. Pharynx $\to$ Oesophagus $\to$ Gizzard $\to$ Crop $\to$ Ileum $\to$ Colon $\to$ Rectum
4. Pharynx $\to$ Oesophagus $\to$ Gizzard $\to$ Ileum $\to$ Crop $\to$ Colon $\to$ Rectum

15.

The concept of "Omnis cellula-e-cellula" regarding cell division was first proposed by:

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

16.

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

17.

Which of the following pair of organelles does not contain DNA?
1. Nuclear envelope and Mitochondria
2. Mitochondria and Lysosomes
3. Chloroplast and Vacuoles
4. Lysosomes and vacuoles

18.

Which of the following statements is not correct?

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

19.

Purines found both in DNA and RNA are:

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

20.

Consider the following statements:

(A)	Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group
(B)	A complete catalytic enzyme with its bound prosthetic group is called apoenzyme

Select the correct option
1. (A) is False but (B) is True
2. Both (A) and (B) are True
3. (A) is True but (B) is False
4. Both (A) and (B) are False

21.

Concanavalin A is:
1. a pigment
2. an alkaloid
3. an essential oil
4. a lectin

22.

Cells in $G_{0}$ phase:
1. terminate the cell cycle
2. exit the cell cycle
3. enter the cell cycle
4. suspend the cell cycle

23.

The shorter and longer arms of submetacentric chromosome are referred to as:
1. m-arm and n-arm respectively
2. s-arm and l-arm respectively
3. p-arm and q-arm respectively
4. q-arm and p-arm respectively

24.

The correct sequence of phases in cell cycle is:
1. $G_{1} \to S \to G_{2} \to M$
2. $M \to G_{1} \to G_{2} \to S$
3. $G_{1} \to G_{2} \to S \to M$
4. $S \to G_{1} \to G_{2} \to M$

25.

Xylem translocates:
1. Water, mineral salts, some organic nitrogen and hormones
2. Water only
3. Water and mineral salts only
4. Water, minerals and some organic nitrogen only

26.

What is the direction of movement of sugars in phloem?
1. Bi-directional
2. Non-multidirectional
3. Upward
4. Downward

27.

Thiobacillus is a group of bacteria helpful in carrying out:

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

28.

What is the site of perception of photoperiod necessary for induction of flowering in plants?
1. Leaves
2. Lateral buds
3. Pulvinus
4. Shoot apex

29.

Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:
1. Phosphofructokinase
2. Aldolase
3. Hexokinase
4. Enolase

30.

Respiratory Quotient (RQ) value of tripalmitin is:
1. 0.09
2. 0.9
3. 0.7
4. 0.007

31.

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

32. Match the following structures with their respective location in organs:

(a)	Crypts of Lieberkuhn	(i)	Pancreas
(b)	Glisson’s Capsule	(ii)	Duodenum
(c)	Islets of Langerhans	(iii)	Small intestine
(d)	Brunner’s Glands	(iv)	Liver

Select the correct option from the following:

	(a)	(b)	(c)	(d)
1.	(iii)	(ii)	(i)	(iv)
2.	(iii)	(i)	(ii)	(iv)
3.	(ii)	(iv)	(i)	(iii)
4.	(iii)	(iv)	(i)	(ii)

33.

Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.
1. Duodenal cells
2. Chief cells
3. Goblet cells
4. Oxyntic cells

34.

Tidal Volume and Expiratory Reserve Volume of an athlete are 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?
1. 2700 mL
2. 1500 mL
3. 1700 mL
4. 2200 mL

35.

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from a respiratory disorder causing wheezing due to:
1. reduction in the secretion of surfactants by pneumocytes
2. benign growth on the mucous lining of nasal cavity
3. inflammation of bronchi and bronchioles
4. proliferation of fibrous tissues and damage of the alveolar walls

36.

Match Column I and Column II :

Column I	Column II
(a) P-wave	(i) Depolarisation of ventricles
(b) QRS complex	(ii) Repolarisation of ventricles
(c) T-wave	(iii) Coronary ischemia
(d) Reduction in the size of T-wave	(iv) Depolarisation of atria
	(v) Repolarisation of atria

Select the correct option:

	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(v)	(iv)
2.	(iv)	(i)	(ii)	(iii)
3.	(iv)	(i)	(ii)	(v)
4.	(ii)	(i)	(v)	(iii)

37.

What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
1. 125 beats per minute
2. 50 beats per minute
3. 75 beats per minute
4. 100 beats per minute

38.

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

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

39.

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

40.

Which of the following muscular disorders is inherited?
1. Botulism
2. Tetany
3. Muscular dystrophy
4. Myasthenia gravis

41.

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

42.

Which of the following statements is correct?
1. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye
2. Cornea is an external, transparent and protective proteinacious covering of the eye-ball
3. Cornea consists of dense connective tissue of elastin and can repair itself
4. Cornea is convex, transparent layer which is highly vascularised

43.

Which part of the brain is responsible for thermoregulation?
1. Medulla oblongata
2. Cerebrum
3. Hypothalamus
4. Corpus callosum

44.

Which of the following glucose transporters is insulin-dependent?
1. GLUT IV
2. GLUT I
3. GLUT II
4. GLUT III

45.

How does steroid hormone influence the cellular activities?

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

46.

Match the following hormones with the respective disease:

(a) Insulin	(i) Addison's disease
(b) Thyroxin	(ii) Diabetes insipidus
(c) Corticoids	(iii) Acromegaly
(d) Growth Hormone	(iv) Goitre
	(v) Diabetes mellitus

Select the correct option.
(a) (b) (c) (d)
1. (ii) (iv) (i) (iii)
2. (v) (i) (ii) (iii)
3. (ii) (iv) (iii) (i)
4. (v) (iv) (i) (iii)

47.

In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as:
1. Parthenogenesis
2. Autogamy
3. Parthenocarpy
4. Syngamy

48.

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

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

49.

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

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

50.

Extrusion of the second polar body from egg nucleus occurs:
1. simultaneously with first cleavage
2. after entry of sperm but before fertilization
3. after fertilization
4. before entry of sperm into ovum

51.

Select the correct sequence for transport of sperm cells in male reproductive system.
1. Testis $\to$ Epididymis $\to$ Vasa efferentia $\to$ Vas deferens $\to$ Ejaculatory duct $\to$ Inguinal canal
$\to$ Urethra $\to$ Urethral meatus
2. Testis $\to$ Epididymis $\to$ Vasa efferentia $\to$ Rete testis $\to$ Inguinal canal $\to$ Urethra
3. Seminiferous tubules $\to$ Rete testis $\to$ Vesa efferentia $\to$ Epididymus $\to$ Vas deferens $\to$
Ejaculatory duct $\to$ Urethra $\to$ Urethral meatus
4. Seminiferous tubules $\to$ Vasa efferentia $\to$ Epididymis $\to$ Inguinal canal $\to$ Urethra

52.

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

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

53.

Select the hormone-releasing Intra-Uterine Devices:
1. Lippes Loop, Multitoad 375
2. Vaults, LNG-20
3. Multiload 375, Progestasert
4. Progestasert, LNG-20

54.

Which of the following sexually transmitted diseases is not completely curable?
1. Chlamydiosis
2. Gonorrhoea
3. Genital warts
4. Genital herpes

55.

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in $F_{1}$ generation, pink flowers were obtained. When pink flowers were selfed, the $F_{2}$ generation showed white, red and pink flowers. Choose the incorrect statement from the following:
1. Law of Segregation does not apply in this experiment
2. This experiment does not follow the Principle of Dominance
3. Pink colour in $F_{1}$ is due to incomplete dominance
4. Ratio of $F_{2}$ is 1/4(red):2/4(pink):1/4(white)

56.

Select the incorrect statement:

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

57.

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

58.

What map unit (Centimorgan) is adopted in the construction of genetic maps?
1. A unit of distance between genes on chromosomes, representing 50% cross over.
2. A unit of distance between two expressed genes, representing 10% cross over.
3. A unit of distance between two expressed genes, representing 100% cross over.
4. A unit of distance between genes on chromosomes. representing 1% cross over.

59.

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:
1. Sutton Boveri
2. T.H. Morgan
3. Gregor J. Mendel
4. Alfred Sturtevant

60.

What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile?
1. Down's syndrome
2. Turner's syndrome
3. Klinefelter's syndrome
4. Edward syndrome

61.

Under which of the following conditions will there be no change in the reading frame of the following mRNA?
5'AACAGCGGUGCUAUU 3'
1. Deletion of GGU from 7th, 8th and 9th positions
2. Insertion of G at 5th position
3. Deletion of G from 5th position
4. Insertion of A and G at 4th and 5th positions respectively

62.

Expressed Sequence Tags (ESTs) refers to:
1. Novel DNA sequence
2. Genes expressed as RNA
3. Polypeptide expression
4. DNA polymorphism

63.

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?
1. Genetic code is specific
2. Genetic code is not ambiguous
3. Genetic code is redundant
4. Genetic code is nearly universal

64.

Variations caused by mutation, as proposed by Hugo de Vries, are:
1. small and directionless
2. random and directional
3. random and directionless
4. small and directional

65.

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 weights from 2 to 2.5 kg or 4.5 kg to 5 kg die. Which type of selection process is taking place?
1. Cyclical selection
2. Directional selection
3. Stabilizing selection
4. Disruptive selection

66.

Match the hominids with their correct brain size:
(a) Homo habilis (i) 900 cc
(b) Homo neanderthalensis (ii) 1250 cc
(c) Homo erectus (iii) 650-800 cc
(d) Homo sapiens (iv) 1400 cc
Select the correct option.
(a) (b) (c) (d)
1. (iv) (iii) (i) (ii)
2. (iv) (i) (iv) (ii)
3. (iii) (ii) (i) (iv)
4. (iii) (iv) (i) (ii)

67.

Which of the following can be used as a biocontrol agent in the treatment of plant disease?
1. Lactobacillus
2. Trichoderma
3. Chlorella
4. Anabaena

68.

Select the correct group of biocontrol agents:

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

69.

Which of the following is a commercial blood cholesterol lowering agent?
1. Lipase
2. Cyclosporin A
3. Statin
4. Streptokinase

70. Match the following :

(a)	Lactobacillus	(i)	Cheese
(b)	Saccharomyces cerevisiae	(ii)	Curd
(c)	Aspergillus niger	(iii)	Citric Acid
(d)	Acetobacter aceti	(iv)	Bread
		(v)	Acetic acid

Select the correct option
(a) (b) (c) (d)
1. (ii) (i) (iii) (v)
2. (ii) (iv) (v) (iii)
3. (ii) (iv) (iii) (v)
4. (iii) (iv) (v) (i)

71.

Which of the following equipments is essentially required for growing microbes on a large scale for industrial production of enzymes?
1. Bioreactor
2. BOD incubator
3. Sludge digester
4. Industrial oven

72.

Select the incorrect statement
1. Inbreeding helps in accumulation of superior genes and elimination of undesirable genes
2. Inbreeding is essential homozygosity
3. Inbreeding is essential to evolve purelines in any animal
4. Inbreeding selects harmful recessive genes that reduce fertility and productivity

73.

Which of the following immune responses is responsible for rejection of kidney graft?
1. Cell mediated immune response
2. Auto-immune response
3. Humoral immune response
4. Inflammatory immune response

74.

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

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

75.

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.
1. Salmonella typhi/Widal test
2. Plasmodium vivax/UTI test
3. Streptococcus pneumoniae/Widal test
4. Salmonella typhi/Anthrone test

76.

Drug called 'Heroin' is synthesized by:
1. nitration of morphine
2. methylation of morphine
3. acetylation of morphine
4. glycosylation of morphine

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

(a)	i gene	(i)	$β$ -galactosidase
(b)	Z gene	(ii)	Permease
(c)	A gene	(iii)	Repressor
(d)	Y gene	(iv)	transacetylase

Select the correct option
(a) (b) (c) (d)
1. (iii) (iv) (i) (ii)
2. (i) (iii) (ii) (iv)
3. (iii) (i) (ii) (iv)
4. (iii) (i) (iv) (ii)

78.

Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement
1. The enzyme recognizes a specific palindromic nucleotide sequence in the DNA
2. The enzyme cuts DNA molecules at identified position within the DNA
3. The enzyme binds DNA at specific sites and cuts only one of the two strands
4. The enzyme cuts the sugar-phosphate backbone at specific sites on each strand

79.

What triggers activation of protoxin to active Bt toxin of Bacillus thuringeinsis in boll worm?
1. Acidic pH of stomach
2. Body temperature
3. Moist surface of midgut
4. Alkaline pH of gut

80.

Which of the following is true for Golden rice?
1. It has yellow grains, because of gene introduced from a primitive variety of rice
2. It is Vitamin A enriched, with a gene from daffodil
3. It is pest resistant, with a gene from Bacillus thuringiensis
4. It is drought tolerant, developed using Agrobacterium vector

81.

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

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

82.

Match the Column-I with Column-II

	Column-I		Column-II
(a)	Saprophyte	(i)	Symbiotic association of fungi with plant roots
(b)	Parasite	(ii)	Decomposition of dead organic materials
(c)	Lichens	(iii)	Living on living plants or animals
(d)	Mycorrhiza	(iv)	Symbiotic association of algae and fungi

Choose the correct answer from the options given below:

	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(iv)	(i)
2.	(i)	(ii)	(iii)	(iv)
3.	(iii)	(ii)	(i)	(iv)
4.	(ii)	(i)	(iii)	(iv)

83.

Which of the following ecological pyramids is generally inverted?
1. Pyramid of biomass in a sea
2. Pyramid of numbers in grassland
3. Pyramid of energy
4. Pyramid of biomass in a forest

84.

Which one of the following is not a method of in situ conservation of biodiversity
1. Sacred Grove
2. Biosphere Reserve
3. Wildlife Sanctuary
4. Botanical Garden

85.

Which of the following is the most important cause for animals and plants being driven to extinction?
1. Alien species invasion
2. Habitat loss and fragmentation
3. Drought and floods
4. Economic exploitation

86.

The Earth Summit held in Rio de Janeiro in 1992 was called:
1. for immediate steps to discontinue use of CFCs that were damaging the ozone layer
2. to reduce ${CO}_{2}$ emissions and global warming
3. for conservation of biodiversity and sustainable utilization of its benefits
4. to asess threat posed to native species by invasive weed species

87.

Which of these following methods is the most suitable for disposal of nuclear waste?
1. Bury the waste within rocks deep below the Earth's surface
2. Shoot the waste into space
3. Bury the waste under Antarctic ice-cover
4. Dump the waste within rocks under deep ocean

88.

Which of the following pair of gases is mainly responsible for the greenhouse effect?
1. Carbon dioxide and methane
2. Ozone and Ammonia
3. Oxygen and Nitrogen
4. Nitrogen and Sulphur dioxide

89.

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:
1. making tubes and pipes
2. making plastic sacks
3. use as a fertilizer
4. construction of roads

90.

Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?
1. Geneva protocol
2. Montreal protocol
3. Kyoto protocol
4. Gothenburg protocol

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