Practice NEET 2020 Biology Questions (Phase - 1)

NEET Previous year Question Papers is one of the strong tool for the preparation of NEET. So, let’s practice NEET 2020 Biology Question (1st phase, held on 13th September). At the end of this practice session, you can “Check Score” and see the correct answers with explanation.

NEET 2020 Biology Questions

1. Identify the basic amino acid from the following.

Lysine

Valine

Tyrosine

Glutamic Acid

2. Match the following :

NEET 2020 Paper Biomolecules

Choose the correct option from the following :

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

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

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

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

3. Select the correct statement.

Insulin is associated with hyperglycemia.

Glucocorticoids stimulate gluconeogenesis.

Insulin acts on pancreatic cells and adipocytes.

Glucagon is associated with hypoglycemia.

4. Select the option including all sexually transmitted diseases :

Cancer, AIDS, Syphilis

Gonorrhoea, Syphilis, Genital herpes

Gonorrhoea, Malaria, Gential herpes

AIDS, Malaria, Filaria

5. Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ?

Renal calculi and Hyperglycaemia

Uremia and Renal Calculi

Uremia and Ketonuria

Ketonuria and Glycosuria

6. If the head of cockroach is removed, it may live for few days because :

The head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.

The supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.

The cockroach does not have nervous system.

The head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.

7. The number of substrate level phosphorylations in one turn of citric acid cycle is :

Zero

One

Two

Three

8. Match the following diseases with the causative organism and select the correct option.

Column – I Column – II

(a) Typhoid (i) Wuchereria

(b) Pneumonia (ii) Plasmodium

(d) Malaria (iv) Haemophilus

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

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

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

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

9. Bilaterally symmetrical and acoelomate animals are exemplified by :

Annelida

Ctenophora

Platyhelminthes

Aschelminthes

10. Snow-blindness in Antarctic region is due to :

Damage to retina caused by infra-red rays

Freezing of fluids in the eye by low temperature

Inflammation of cornea due to high dose of UV-B radiation

High reflection of light from snow

11. Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?

Low concentration of LH

High concentration of Estrogen

High concentration of Progesterone

Low concentration of FSH

12. Meiotic division of the secondary oocyte is completed :

At the time of fusion of a sperm with an ovum

Prior to ovulation

At the time of copulation

After zygote formation

13. Match the organism with its use in biotechnology.

NEET 2020 Question, Biotechnology

Select the correct option from the following:

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

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

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

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

14. The ovary is half inferior in :

Plum

Brinjal

Mustard

Sunflower

15. The enzyme enterokinase helps in conversion of :

pepsinogen into pepsin

protein into polypeptides

trypsinogen into trypsin

caseinogen into casein

16. Which of the following statements is not correct ?

Genetically engineered insulin is produced in E coli.

In man insulin is synthesised as a proinsulin.

The proinsulin has an extra peptide called C-peptide.

The functional insulin has A and B chains linked together by hydrogen bonds.

17. Which of the following regions of the globe exhibits highest species diversity?

Amazon forests

Western Ghats of India

Madagascar

Himalayas

18. Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their :

Effect on reproduction

Nutritive value

Growth response

Defence action

19. Match the following concerning essential elements and their functions in plants :

NEET 2020 Questions, Plant Mineral

Select the correct option :

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

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

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

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

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

Column – I Column – II

(a) Bt cotton (i) Gene therapy

(b) ADA deficiency (ii) Cellular defence

(d) PCR (iv) Bacillus thuringiensis

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

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

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

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

21. Cuboidal epithelium with brush border of microvilli is found in :

ducts of salivary glands

eustachian tube

lining of intestine

proximal convoluted tubule of nephron

22. Select the correct events that occur during inspiration.

(a) Contraction of diaphragm

(b) Contraction of external inter-costal muscles

(d) Intra pulmonary pressure increases

(a) and (b)

(a), (b) and (d)

only (d)

23. Which of the following statements is correct ?

Adenine does not pair with thymine

Adenine pairs with thymine through one H-bond

Adenine pairs with thymine through two H-bonds

Adenine pairs with thymine through three H-bond

24. In water hyacinth and water lily, pollination takes place by :

insects and water

wind and water

water currents only

insects or wind

25. The process of growth is maximum during :

Dormancy

Log phase

Lag phase

Senescence

26. Identify the wrong statement with reference to immunity.

Foetus receives some antibodies from mother, it is an example for passive immunity.

When exposed to antigen (living or dead) antibodies are produced in the host’s body. It is called “Active immunity”.

When ready-made antobodies are directly given, it is called “Passive immunity”.

Active immunity is quick and gives full response.

27. Identify the substances having glycosidic bond and peptide bond, respectively in their structure :

Inulin, insulin

Chitin, Cholesterol

Glycerol, trypsin

Cellulose, lecithin

28. The sequence that controls the copy number of the linked DNA in the vector, is termed :

Recognition site

Selectable marker

Ori site

Palindromic sequence

29. Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

Abscisic acid

Cytokinin

Gibberellin

Ethylene

30. By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams ?

Inbreeding

Mutational breeding

Cross breeding

Out crossing

31. Which of the following is the most abundant protein in the animals ?

Haemoglobin

Insulin

Collagen

Lectin

32. Which of the following is put into Anaerobic sludge digester for further sewage treatment ?

Activated sludge

Primary sludge

Floating debris

Effluents of primary treatment

33. Identify the correct statement with regard to G₁ phase (Gap 1) of interphase.

Nuclear Division takes place.

DNA synthesis or replication takes place.

Reorganisation of all cell components takes place.

Cell is metabolically active, grows but does not replicate its DNA.

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

NEET 2020 Question, Blood

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

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

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

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

35. Match the following column with respect to meiosis :

NEET 2020 Question Meiosis

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

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

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

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

36. Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells ?

Polysomes

Endoplasmic reticulum

Peroxisomes

Golgi bodies

37. In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ?

There is no relationship between Gross primary productivity and Net primary productivity.

Gross primary productivity is always less than net primary productivity.

Gross primary productivity is always more than net primary productivity.

Gross primary productivity and Net primary productivity are one and same.

38. From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask :

CH₃, H₂, NH₄ and water vapor at 800°C

CH₄, H₂, NH₃ and water vapor at 800°C

CH₄, H₂, NH₃ and water vapor at 600°C

CH₃, H₂, NH₃ and water vapor at 600°C

39. Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?

(a) Darwin’s Finches of Galapagos islands.

(b) Herbicide resistant weeds.

(d) Man-created breeds of domesticated animals like dogs.

Only (a)

(a) and (c)

(b), (c) and (d)

Only (d)

40. Identify the correct statement with reference to human digestive system.

Vermiform appendix arises from duodenum

Ileum opens into small intestine

Serosa is the innermost layer of the alimentary canal

Ileum is highly coiled part

41. Experimental verification of the chromosomal theory of inheritance was done by :

Morgan

Mendel

Sutton

Boveri

42. In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

GIFT and ZIFT

ZIFT and IUT

GIFT and ICSI

ICSI and ZIFT

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

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

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

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

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

44. The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are :

Ammonia and hydrogen

Ammonia alone

Nitrate alone

Ammonia and oxygen

45. The QRS complex in a standard ECG represents:

Repolarisation of ventricles

Repolarisation of auricles

Depolarisation of auricles

Depolarisation of ventricles

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

NEET 2020 Question, Human Reproduction

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

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

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

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

47. The body of the ovule is fused within the funicle at :

Chalaza

Micropyle

Hilum

Nucellus

48. Identify the wrong statement with regard to Restriction Enzymes.

Sticky ends can be joined by using DNA ligases.

Each restriction enzyme functions by inspecting the length of a DNA sequence.

They cut the strand of DNA at palindromic sites.

They are useful in genetic engineering.

49. Which of the following is not an attribute of a population?

Species interaction

Sex ratio

Natality

Mortality

50. The infectious stage of Plasmodium that enters the human body is :

Male gametocytes

Female gametocytes

Sporozoites

Trophozoites

51. Strobili or cones are found in :

Equisetum

Salvinia

Pteris

Marchantia

52. The specific palindromic sequence which is recognized by EcoRI is :

5′ – GGATCC – 3′
3′ – CCTAGG – 5′

5′ – GAATTC – 3′
3′ – CTTAAG – 5′

5′ – GGAACC – 3′
3′ – CCTTGG – 5′

53. Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to :

Insect predators

Insect pests

Fungal diseases

Plant nematodes

54. The plant parts which consist of two generations one within the other :

(a) Pollen grains inside the anther

(b) Germinated pollen grain with two male gametes

(d) Embryo sac inside the ovule

(a) only

(a) and (d)

(a), (b) and (c)

55. The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :

2 molecules of 3-C compound

1 molecule of 4-C compound and 1 molecule of 2-C compound

1 molecule of 3-C compound

1 molecule of 6-C compound

56. Select the correct match.

Thalassemia – X linked

Haemophilia – Y linked

Phenylketonuria – Autosomal dominant trait

Sickle cell anaemia – Autosomal recessive trait, chromosome-11

57. Name the enzyme that facilitates opening of DNA helix during transcription.

RNA polymerase

DNA ligase

DNA helicase

DNA polymerase

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

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

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

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

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

59. Which of the following would help in prevention of diuresis ?

Decrease in secretion of renin by JG cells

More water reabsorption due to undersecretion of ADH

Reabsorption of Na+ and water from renal tubules due to aldosterone

Atrial natriuretic factor causes vasoconstriction

60. Which of the following statements about inclusion bodies is incorrect ?

These represent reserve material in cytoplasm.

They are not bound by any membrane.

These are involved in ingestion of food particles.

They lie free in the cytoplasm.

61. Match the trophic levels with their correct species examples in grassland ecosystem.

NEET 2020 Questions, Ecosystem

Select the correct option :

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

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

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

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

62. Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G₀). This process occurs at the end of :

G₂ phase

M phase

G₁ phase

S phase

63. The transverse section of a plant shows following anatomical features:

(a) Large number of scattered vascular bundles surrounded by bundle sheath.

(b) Large conspicuous parenchymatous ground tissue.

(d) Phloem parenchyma absent.

Identify the category of plant and its part :

Dicotyledonous root

Monocotyledonous stem

Dicotyledonous stem

Monocotyledonous root

64. The process reponsible for facilitating loss of water in liquid form from the tip of grasss blades at night and in early morning is :

Plasmolysis

Transpiration

Root pressure

Imbibition

65. According to Robert May, the global species diversity is about :

1.5 million

7 million

20 million

50 million

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

NEET 2020 Question, Microbes

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

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

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

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

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

NEET 2020 paper Animal Kingdom

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

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

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

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

68. Dissolution of the synaptonemal complex occurs during :

Leptotene

Pachytene

Zygotene

Diplotene

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

Column-I Column-II

(a) Pituitary gland (i) Grave’s disease

(b) Thyroid gland (ii) Diabetes mellitus

(d) Pancreas (iv) Addision’s disease

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

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

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

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

70. In gel electrophoresis, separated DNA fragments can be visualized with the help of :

Ethidium bromide in infrared radiation

Acetocarmine in bright blue light

Ethidium bromide in UV radiation

Acetocarmine in UV radiation

71. Which of the following is correct about viroids ?

They have free DNA without protein coat.

They have DNA with protein coat.

They have free RNA without protein coat.

They have RNA with protein coat.

72. Goblet cells of alimentary canal are modified from :

Compound epithelial cells

Squamous epithelial cells

Columnar epithelial cells

Chondrocytes

73. Which of the following statements are true for the phylum-Chordata ?

(a) In Urochordata notochord extends from head to tail and it is present throughout their life.

(b) In Vertebrata notochord is present during the embryonic period only.

(d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.

(b) and (c)

(a) and (b)

(d) and (c)

74. Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

Allele ‘i’ does not produce any sugar.

The gene (I) has three alleles.

A person will have only two of the three alleles.

When I^A and I^B are present together, they express same type of sugar.

75. Which of the following is not an inhibitory substance governing seed dormancy?

Para-ascorbic acid

Gibberellic acid

Abscisic acid

Phenolic acid

76. Flippers of Penguins and Dolphins are examples of :

Natural selection

Adaptive radiation

Convergent evolution

Industrial melanism

77. Embryological support for evolution was disapproved by :

Oparin

Karl Ernst von Baer

Alfred Wallace

Charles Darwin

78. Choose the correct pair from the following :

Exonucleases : Make cuts at specific positions within DNA

Ligases : Join the two DNA molecules

Polymerases : Break the DNA into fragments

Nucleases : Separate the two strands of DNA

79. Which of the following pairs is of unicellular algae?

Chlorella and Spirulina

Anabaena and Volvox

Gelidium and Gracilaria

Laminaria and Sargassum

80. Floridean starch has structure similar to :

Laminarin and cellulose

Starch and cellulose

Amylopectin and glycogen

Mannitol and algin

81. Montreal protocol was signed in 1987 for control of :

Release of Green House gases

Disposal of e-wastes

Emission of ozone depleting substances

Transport of Genetically modified organisms from one country to another

82. Identify the wrong statement with reference to transport of oxygen.

Low pCO2 in alveoli favours the formation of oxyhaemoglobin.

Binding of oxygen with haemoglobin is mainly related to partial pressure of O2.

Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin.

Partial pressure of CO2 can interfere with O2 binding with haemoglobin.

83. The roots that originate from the base of the stem are :

Lateral roots

Fibrous roots

Primary roots

Prop roots

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

NEET 2020 Question, Animal Kingdom

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

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

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

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

85. How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

86. Ray florets have :

Half inferior ovary

Inferior ovary

Superior ovary

Hypogynous ovary

87. In light reaction, plastoquinone facilitates the transfer of electrons from :

PS-I to ATP synthase

PS-II to Cytb₆f complex

Cytb₆f complex to PS-I

PS-I to NADP⁺

88. Identify the incorrect statement.

Due to deposition of tannins, resins, oils etc., heart wood is dark in colour

Heart wood does not conduct water but gives mechanical support

Sapwood is involved in conduction of water and minerals from root to leaf

Sapwood is the innermost secondary xylem and is lighter in colour

89. If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10⁹ bp, then the length of the DNA is approximately :

2.0 meters

2.2 meters

2.5 meters

2.7 meters

90. The first phase of translation is :

Recognition of an anti-codon

Binding of mRNA to ribosome

Recognition of DNA molecule

Aminoacylation of tRNA

Question 1 of 90

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NEET 2020 Biology Questions

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