NEET 2020 Biology Questions (2nd Phase) with Solutions

NEET Previous year Question practice is one of the important tool for the preparation of NEET. Here you can practice NEET 2020 Biology Questions (2nd phase, held on 14th October 2020) and at the end of this practice session, check your attempted score as well as get correct answers with explanation of all the questions. So, let’s practice…

1. Match the following concerning the activity/function and the phytohormone involved :-

(a) Fruit ripener (i) Abscisic acid
(b) Herbicide (ii) GA₃
(c) Bolting agent (iii) 2, 4-D
(d) Stress hormone (iv) Ethephon

Select the correct option from following :

(a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

(a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)

(a) – (iv), (b) – (iii), (c) – (ii), (d) – (i)

(a) – (iv), (b) – (ii), (c) – (i), (d) – (iii)

2. Which is the basis of genetic mapping of human genome as well as DNA finger printing ?

Polymorphism in DNA sequence

Single nucleotide polymorphism

Polymorphism in hnRNA sequence

Polymorphism in RNA sequence

3. Match the following columns and select the correct option :

Column – I Column – II
(i) Typhoid (a) Haemophilus influenzae
(ii) Malaria (b) Wuchereria bancrofti
(iii) Pneumonia (c) Plasmodium vivax
(iv) Filariasis (d) Salmonella typhi

(i)-(d), (ii)-(c), (iii)-(a), (iv)-(b)

(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)

(i)-(a), (ii)-(c), (iii)-(b), (iv)-(d)

(i)-(a), (ii)-(b), (iii)-(d), (iv)-(c)

4. The laws and rules to prevent unauthorised exploitation of bio-resources are termed as :

Biopatenting

Bioethics

Bioengineering

Biopiracy

5. In cockroach, identify the parts of the foregut in correct sequence :

Mouth → Oesophagus → Pharynx → Crop → Gizzard

Mouth → Crop → Pharynx → Oesophagus → Gizzard

Mouth → Gizzard → Crop → Pharynx → Oesophagus

Mouth → Pharynx → Oesophagus → Crop → Gizzard

6. Match the following columns with reference to cockroach and select the correct option :

Column – I Column – II
(a) Grinding of (i) Hepatic caecal
the food particles
(b) Secrete gastric (ii) 10th segment
juice
(c) 10 pairs (iii) Proventriculus
(d) Anal cerci (iv) Spiracles
(v) Alary muscles

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

(a)-(iv), (b)-(iii), (c)-(v), (d)-(ii)

(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)

(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

7. Match the following :

(a) Aquaporin (i) Amide

(b) Asparagine (ii) Polysaccharide

(d) Chitin (iv) Carotenoids

Select the correct option :

(a) – (iii), (b) – (i), (c) – (iv), (d) – (ii)

(a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

(a) – (ii), (b) – (i), (c) – (iv), (d) – (iii)

(a) – (iii), (b) – (i), (c) – (ii), (d) – (iv)

8. Which of the following is the correct floral formula of Liliaceae ?

Floral Formula

(1)

(2)

(3)

(4)

9. Match the following columns and select the correct option :

Column – I Column – II
(a) Ovary (i) HCG
(b) Placenta (ii) Estrogen
(c) Corpus luteum (iii) Androgens
(d) Leydig cells (iv) Progesterone

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

10. For the commercial and industrial production of Citric Acid, which of the following microbes is used ?

Aspergillus niger

Lactobacillus sp

Saccharomyces cerevisiae

Clostridium butylicum

11. Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants —

Vehicular exhaust

Allergy causing pollen

Noise

Particulates of size 2.5 micrometer or below

12. A species which was introduced for ornamentation but has become a trouble-some weed in India :

Parthenium hysterophorus

Eichhornia crassipes

Prosopis juliflora

Trapa spinosa

13. In a mitotic cycle, the correct sequence of phases is :

S, G₁, G₂, M

M, G₁, G₂, S

G₁, G₂, S, M

14. E.coli has only 4.6 × 10⁶ base pairs and completes the process of replication within 18 minutes; then the average rate of polymerisation is approximately :

2000 base pairs/second

3000 base pairs/second

4000 base pairs/second

1000 base pairs/second

15. Embryological support for evolution was proposed by :

Ernst Heckel

Karl Ernst von Baer

Charles Darwin

Alfred Wallace

16. After about how many years of formation of earth, life appeared on this planet ?

500 billion years

50 million years

500 million years

50 billion years

17. Which of the following statements is incorrect ?

RuBisCO is a bifunctional enzyme

In C₄ plants, the site of RuBisCO activity is mesophyll cell

The substrate molecule for RuBisCO activity is a 5-carbon compound

RuBisCO action requires ATP and NADPH

18. In a mixture, DNA fragments are separated by :

Bioprocess engineering

Restriction digestion

Electrophoresis

Polymerase chain reaction

19. The best example for pleiotropy is :

Skin colour

Phenylketoneuria

Colour Blindness

ABO Blood group

20. A Hominid fossil discovered in Java in 1891, now extinct, having cranial capacity of about 900 cc was:

Homo erectus

Neanderthal man

Homo sapiens

Australopithecus

21. Match the following columns and select the correct option :

Pesticides

(a)-(iii), (b)-(v), (c)-(iv), (d)-(i)

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(v)

(a)-(ii), (b)-(iv), (c)-(v), (d)-(iii)

22. Which of the following statements is incorrect ?

Biomass decreases from first to fourth trophic level

Energy content gradually increases from first to fourth trophic level

Number of individuals decreases from first trophic level to fourth trophic level

Energy content gradually decreases from first to fourth trophic level

23. Hormones stored and released from neurohypophysis are :

Thyroid stimulating hormone and Oxytocin

Oxytocin and Vasopressin

Follicle stimulating hormone and Leutinizing hormone

Prolactin and Vasopressin

24. Match the following events that occur in their respective phases of cell cycle and select the correct option :

Cell Division

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

25. In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as :

Ammonia

Glutamate

Nitrates

Ureides

26. Which of the following is incorrect about Cynobacteria ?

They are photoautotrophs

They lack heterocysts

They often form blooms in polluted water bodies

They have chlorophyll A similar to green plants

27. Which of the following options does correctly represent the characteristic features of phylum Annelida ?

Triploblastic, unsegmented body and bilaterally symmetrical.

Triploblastic, flattened body and acoelomate condition.

Diploblastic, mostly marine and radially symmetrical.

28. RNA interference is used for which of the following purposes in the field of biotechnology ?

to develop a plant tolerant to abiotic stresses

to develop a pest resistant plant against infestation by nematode

to enhance the mineral usage by the plant

to reduce post harvest losses

29. Cyclosporin A, used as immuno suppression agent, is produced from :

Monascus purpureus

Saccharomyces cerevisiae

Penicillium notatum

Trichoderma polysporum

30. First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is :

EcoR1

Adenosine deaminase

Thermostable DNA polymerase

Hind II

31. Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are :

Lenticels

Guard cells

Bundle sheath cells

Bulliform cells

32. Match the following columns and select the correct option :

Column – I Column – II
(a) Aptenodytes (i) Flying fox
(b) Pteropus (ii) Angel fish
(c) Pterophyllum (iii) Lamprey
(d) Petromyzon (iv)Penguin

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

33. Match the following columns and select the correct option :

Column – I Column – II
(a) Smooth (i) Protein synthesis
endoplasmic
reticulum
(b) Rough (ii) Lipid synthesis
endoplasmic
reticulum
(c) Golgi complex (iii) Glycosylation
(d) Centriole (iv) Spindle formation

(a)-(ii), (b)-(i), (c)-(iii). (d)-(iv)

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

34. The term ‘Nuclein’ for the genetic material was used by :

Franklin

Meischer

Chargaff

Mendel

35. In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:

Eyelids and eyelashes are formed

Most of the major organ systems are formed

The head is covered with fine hair

Movement of the foetus

36. During Meiosis 1, in which stage synapsis takes place ?

Pachytene

Zygotene

Diplotene

Leptotene

37. Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to :

Gibberellic acid

Nitrate

Ascorbic acid

Chilling conditions

38. The Total Lung Capacity (TLC) is the total volume of air accomodated in the lungs at the end of a forced inspiration. This includes :

RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV

RV; ERV; IC and EC

RV; ERV; VC (Vital Capacity) and
FRC (Functional Residual Capacity)

RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume)

39. Intrinsic factor that helps in the absorption of vitamin B₁₂ is secreted by :

Goblet cells

Hepatic cells

Oxyntic cells

Chief cells

40. Which of the following conditions cause erythroblastosis foetalis ?

Mother Rh^+ve and foetus Rh^–ve

Mother Rh^–ve and foetus Rh^+ve

Both mother and foetus Rh^–ve

Both mother and foetus Rh^+ve

41. Select the incorrectly matched pair from following :

Chondrocytes – Smooth muscle cells

Neurons – Nerve cells

Fibroblast – Areolar tissue

Osteocytes – Bone cells

42. Which of the following elements helps in maintaining the structure of ribosomes ?

Magnesium

Zinc

Copper

Molybdenum

43. Match the following columns and select the correct option.

Auto immune disorder

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(iii), (b)-(i), (c)-(ii), (d)-(v)

(a)-(iv), .(b)-(v), (c)-(i), (d)-(ii)

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

44. The increase in osmolarity from outer to inner medullary interstitium is maintained due to :

(i) Close proximity between Henle’s loop and vasa recta
(ii) Counter current mechanism
(iii) Selective secretion of HCO₃¯ and hydrogen ions in PCT
(iv) Higher blood pressure in glomerular capillaries

Only (ii)

(iii) and (iv)

(i), (ii) and (iii)

(i) and (ii)

45. Which of the following statements about cork cambium is incorrect ?

It forms secondary cortex on its outerside

It forms a part of periderm

It is responsible for the formation of lenticels

It is a couple of layers thick

46. Match the following techniques or instruments with their usage :

Biotechnology NEET 20 Questions

Select the correct option from following:

(a) – (iii), (b) – (ii), (c) – (iv), (d) – (i)

(a) – (ii), (b) – (i), (c) – (iv), (d) – (iii)

(a) – (iv), (b) – (iii), (c) – (ii), (d) – (i)

(a) – (ii), (b) – (i), (c) – (iii), (d) – (iv)

47. According to Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health ?

3.5 micrometers

2.5 micrometers

4.0 micrometers

3.0 micrometers

48. Identify the correct features of Mango and Coconut fruits.

(i) In both fruit is a drupe
(ii) Endocarp is edible in both
(iii) Mesocarp in Coconut is fibrous, and in Mango it is fleshy
(iv) In both, fruit develops from monocarpellary ovary

Select the correct option from below :

(i), (iii) and (iv) only

(i), (ii) and (iii) only

(i) and (iv) only

(i) and (ii) only

49. Which of the following is associated with decrease in cardiac output ?

Sympathetic nerves

Parasympathetic neural signals

Pneumotaxic centre

Adrenal medullary hormones

50. Select the correct statement :

Atrial Natriuretic Factor increases the blood pressure.

Angiotensin II is a powerful vasodilator.

Counter current pattern of blood flow is not observed in vasa recta.

Reduction in Glomerular Filtration Rate activates JG cells to release renin.

51. Select the correct option of haploid cells from the following groups :

Primary oocyte, Secondary oocyte, Spermatid

Secondary spermatocyte, First polar body, Ovum

Spermatogonia, Primary spermatocyte, Spermatid

Primary spermatocyte, Secondary spermatocyte, Second polar body

52. Which of the following is incorrect for wind-pollinated plants ?

Well exposed stamens and stigma

Many ovules in each ovary

Flowers are small and not brightly coloured

Pollen grains are light and non-sticky

53. The number of contrasting characters studied by Mendel for his experiments was :

54. Inclusion bodies of blue- green, purple and green photosynthetic bacteria are :

Contractile vacuoles

Gas vacuoles

Centrioles

Microtubules

55. Which of the following statements is incorrect regarding the phosphorus cycle ?

Phosphates are the major form of phosphorus reservoir

Phosphorus solubilising bacteria facilitate the release of phosphorus from organic remains

There is appreciable respiratory release of phosphorus into atmosphere

It is sedimentary cycle

56. Match the following columns and select the correct option :

Column – I Column – II
(a) Pneumotaxic (i) Alveoli
Centre
(b) O₂ Dissociation (ii) Pons
curve
(c) Carbonic (iii) Haemoglobin
Anhydrase
(d) Primary site of (iv) R.B.C.
exchange of gases

(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

57. The rate of decomposition is faster in the ecosystem due to following factors except :

Detritus rich in sugars

Warm and moist environment

Presence of aerobic soil microbes

Detritus richer in lignin and chitin

58. Which of the following statements is incorrect about gymnosperms ?

They are heterosporous

Male and female gametophytes are free living

Most of them have narrow leaves with thick cuticle

Their seeds are not covered

59. The proteolytic enzyme rennin is found in :

Intestinal juice

Bile juice

Gastric juice

Pancreatic juice

60. The yellowish fluid “colostrum” secreted by mammary glands of mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as :

Passive immunity

Active immunity

Acquired immunity

Autoimmunity

61. Match the following columns and select the correct option :-

Column-I Column-II
(a) Pituitary hormone (i) Steroid
(b) Epinephrine (ii) Neuropeptides
(c) Endorphins (iii) Peptides, proteins
(d) Cortisol (iv) Biogenic amines

(a) – (iv), (b) – (i), (c) – (ii), (d) – (iii)

(a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)

(a) – (iv), (b) – (iii), (c) – (i), (d) – (ii)

(a) – (iii), (b) – (iv), (c) – (i), (d) – (ii)

62. In the following in each set a conservation approach and an example of method of conservation are given –
(a) In situ conservation – Biosphere Reserve
(b) Ex situ conservation – Sacred groves
(c) In situ conservation – Seed bank
(d) Ex situ conservation – Cryopreservation

Select the option with correct match of approach and method :

(a) and (c)

(a) and (d)

(b) and (d)

(a) and (b)

63. Male and female gametophytes do not have an independent free living existence in :

Pteridophytes

Algae

Angiosperms

Bryophytes

64. In some plants thalamus contributes to fruit formation. Such fruits are termed as :

False fruits

Aggregate fruits

True fruits

Parthenocarpic fruit

65. During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PS II, what is the source which replaces these electrons?

Oxygen

Water

Carbon dioxide

Light

66. Phycoerythrin is the major pigment in :

Red algae

Blue green algae

Green algae

Brown algae

67. Who coined the term ‘Kinetin’ ?

Skoog and Miller

Darwin

Went

Kurosawa

68. Match the following columns and select the correct option :

Human Eye

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

69. Select the incorrect statement.

Transport of molecules in phloem can be bidirectional.

Movement of minerals in xylem is unidirectional

Unloading of sucrose at sink does not involve the utilization of ATP.

Elements most easily mobilized in plants from one region to another are: phosphorus, sulphur, nitrogen and potassium.

70. The size of Pleuropneumonia – like Organism (PPLO) is :

0.02 µm

1 – 2 µm

10 – 20 µm

0.1 µm

71. The biosynthesis of ribosomal RNA occurs in :

Ribosomes

Golgi apparatus

Microbodies

Nucleolus

72. The impact of immigration on population density is :

Negative

Both positive and negative

Neutralized by natality

Positive

73. According to Alexander von Humboldt :

Species richness decreases with increasing area of exploration

Species richness increases with increasing area, but only up to limit

There is no relationship between species richness and area explored.

Species richness goes on increasing with increasing area of exploration

74. Match the following group of organisms with their respective distinctive characteristics and select the correct option :

Animal Kingdom

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

75. Which of the following STDs are not curable ?

Genital herpes, Hepatitis B, HIV infection

Chlamydiasis, Syphilis, Genital warts

HIV, Gonorrhoea, Trichomoniasis

Gonorrhoea, Trichomoniasis, Hepatitis B

76. Select the correct statement from the following :

Gel electrophoresis is used for amplification of a DNA segment.

The polymerase enzyme joins the gene of interest and the vector DNA.

Restriction enzyme digestions are performed by incubating purified DNA molecules with the restriction enzymes of optimum conditions.

PCR is used for isolation and separation of gene of interest.

77. Correct position of floral parts over thalamus in mustard plant is :

Gynoecium occupies the highest position, while the other parts are situated below it.

Margin of the thalamus grows upward, enclosing the ovary completely, and other parts arise below the ovary.

Gynoecium is present in the centre and other parts cover it partially.

Gynoecium is situated in the centre, and other parts of the flower are located at the rim of the thalamus, at the same level.

78. In Recombinant DNA technology antibiotics are used :

to keep medium bacteria-free

to detect alien DNA

to impart disease-resistance to the host plant

as selectable markers

79. In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of :

2’C pentose sugar

3’C pentose sugar

5’C pentose sugar

1’C pentose sugar

80. Spooling is :

Amplification of DNA

Cutting of separated DNA bands from the agarose gel

Transfer of separated DNA fragments to synthetic membranes

Collection of isolated DNA

81. Attachment of spindle fibers to kinetochores of chromosomes becomes evident in :

Anaphase

Telophase

Prophase

Metaphase

82. Pyruvate dehydrogenase activity during aerobic respiration requires :

Calcium

Iron

Cobalt

Magnesium

83. All vertebrates are chordates but all chordates are not vertebrates, why ?

Notochord is replaced by vertebral column in adult of some chordates.

Ventral hollow nerve cord remains throughout life in some chordates.

All chordates possess vertebral column.

All chordates possess notochord throughout their life.

84. Match the items in Column-I with those in Column-II :

Column I Column II

(a) Herbivores-Plants (i) Commensalism

(b) Mycorrhiza-Plants (ii) Mutualism

(d) Orchid-Tree (iv) Competition

Select the correct option from following :

(a) – (iv), (b) – (ii), (c) – (i), (d) – (iii)

(a) – (iii), (b) – (ii), (c) – (iv), (d) – (i)

(a) – (ii), (b) – (i), (c) – (iii), (d) – (iv)

(a) – (i), (b) – (iii), (c) – (iv), (d) – (ii)

85. Chromosomal theory of inheritance was proposed by :

Sutton and Boveri

Bateson and Punnet

T. H. Morgan

Watson and Crick

86. Inbreeding depression is :

Reduced motility and immunity due to close inbreeding

Decreased productivity due to mating of superior male and inferior female

Decrease in body mass of progeny due to continued close inbreeding

Reduced fertility and productivity due to continued close inbreeding

87. Vegetative propagule in Agave is as :

Rhizome

Bulbil

Offset

Eye

88. The phenomenon of evolution of different species in a given geographical area starting from a point and spreading to other habitats is called :

Saltation

Co-evolution

Natural selection

Adaptive radiation

89. Identify the statement which is incorrect.

Sulphur is an integral part of cysteine.

Glycine is an example of lipids.

Lecithin contains phosphorus atom in its structure.

Tyrosine possesses aromatic ring in its structure.

90. Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of :

Implants only

Injections only

Pills, injections and implants

Pills only

Question 1 of 90

Practice NEET 2020 (Phase 1st) Biology Questions

NEET 2020 Biology Questions (2nd Phase) with Solutions

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