NEET 2020 Biology Questions and Answers (81-90)

 81. 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

(1) G1 phase

 (2) S phase

(3) G2 phase 

(4) M phase

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

(1) Serosa is the innermost layer of the alimentary canal

(2) IIeum is a highly coiled part

(3) Vermiform appendix arises from duodenum

(4) IIeum opens into small intestine

83. 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

(c) Seed inside the fruit

(d) Embryo sac inside the ovule

(1) (a), (b) and (c) 

(2) (c) and (d)

(3) (a) and (d) 

(4) (a) only

84. Dissolution of the synaptonemal complex occurs during

(1) Zygotene

 (2) Diplotene

(3) Leptotene 

(4) Pachytene

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

Column-I                          Column-II

(a) Organ of Corti               (i) Connects middle ear and pharynx

(b) Cochlea                         (ii) Coiled part of the labyrinth

(c) Eustachian tube            (iii) Attached to the oval window

(d) Stapes (iv) Located on the basilar membrane

(a) (b) (c) (d)

(1) (iii) (i) (iv) (ii)

(2) (iv) (ii) (i) (iii)

(3) (i) (ii) (iv) (iii)

(4) (ii) (iii) (i) (iv)

86. The ovary is half inferior in :

(1) Mustard 

(2) Sunflower

(3) Plum 

(4) Brinjal

87. Identify the basic amino acid from the following.

(1) Glutamic Acid 

(2) Lysine

(3) Valine 

(4) Tyrosine

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

Column-I                       Column-II

(a) Eosinophils (i) Immune response

(b) Basophils (ii) Phagocytosis

(c) Neutrophils (iii) Release histaminase, destructive enzymes

(d) Lymphocytes (iv) Release granules containing histamine

  (a) (b) (c) (d)

(1) (iv) (i) (ii) (iii)

(2) (i) (ii) (iv) (iii)

(3) (ii) (i) (iii) (iv)

(4) (iii) (iv) (ii) (i)

89. Match the following

(a) Inhibitor of (i) Ricin catalytic activity

(b) Possess peptide bonds (ii) Malonate

(c) Cell wall material in fungi (iii)Chitin in fungi

(d) Secondary Metabolite (iv) Collagen 

Choose the correct option from the following

(a) (b) (c) (d)

(1) (iii) (i) (iv) (ii)

(2) (iii) (iv) (i) (ii)

(3) (ii) (iii) (i) (iv)

(4) (ii) (iv) (iii) (i)

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

(1) Reorganisation of all cell components takes place.

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

(3) Nuclear Division takes place.

(4) DNA synthesis or replication takes place.

Answers:

81. (4) M phase

82. (2) IIeum is a highly coiled part

83. (3) (a) and (d) 

84. (2) Diplotene

85. (2) (iv) (ii) (i) (iii)

86. (3) Plum 

87. (2) Lysine

88. (4) (iii) (iv) (ii) (i)

89. (4) (ii) (iv) (iii) (i)

90. (2) Cell is metabolically active, grows but does not replicate its DNA.

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NEET Biology 2020 Questions and Answers( 71-81)

 71. Which of the following statements about inclusion bodies in incorrect?

(1) These are involved in ingestion of food particles

(2) They lie free in the cytoplasm

(3) These represent reserve material in cytoplasm

(4) They are not bound by any membrane

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

(1) Gross primary productivity is always more than net primary productivity

(2) Gross primary productivity and Net primary productivity are one and same

(3) There is no relationship between Gross primary productivity and Net primary

productivity

(4) Gross primary productivity is always less than net primary productivity

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

(1) Water currents only

(2) Wind and water

(3) Insects and water

(4) Insects or wind

74. The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is 

(1) Root pressure 

(2) Imbibition 

(3) Plasmolysis 

(4) Transpiration

75. Select the correct statement.

 (1) Glucagon is associated with hypoglycemia. 

(2) Insulin acts on pancreatic cells and adipocytes.

 (3) Insulin is associated with hyperglycemia. 

(4) Glucocorticoids stimulate gluconeogenesis.

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

(1) Abscisic acid 

(2) Phenolic acid

 (3) Para-ascorbic acid 

(4) Gibberellic acid

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

(a) Fourth trophic level 

(i) Crow (b) Second trophic level 

(ii) Vulture (c) First trophic level

 (iii) Rabbit (d) Third trophic level 

 (iv) Grass

Select the correct option

(a) (b) (c) (d)

(1) (iii) (ii) (i) (iv)

(2) (iv) (iii) (ii) (i)

(3) (i) (ii) (iii) (iv)

(4) (ii) (iii) (iv) (i)

78. The first phase of translation is

(1) Recognition of DNA molecule

(2) Aminoacylation of tRNA

(3) Recognition of an anti-codon

(4) Binding of mRNA to ribosome

79. Strobili or cones are found in

(1) Pteris

(2) Marchantia

(3) Equisetum

(4) Salvinia

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

Column-I                                   Column-II

(a) 6-15 pairs of gill slits          (i) Trygon

(b) Heterocercal caudal fin (ii) Cyclostomes

(c) Air Bladder                  (iii)Chondrichthyes

(d) Poison sting                (iv) Osteichthyes

(a) (b) (c) (d)

(1) (iii) (iv) (i) (ii)

(2) (iv) (ii) (iii) (i)

(3) (i) (iv) (iii) (ii)

(4) (ii) (iii) (iv) (i)

Answers

71. (1) These are involved in ingestion of food particles

72. (1) Gross primary productivity is always more than net primary productivity

 73.  (4) Insects or wind

74. (4) Transpiration

75. (4) Glucocorticoids stimulate gluconeogenesis.

76. (1) Abscisic acid 

77. (4) (ii) (iii) (iv) (i)

78. (2) Aminoacylation of tRNA

79. (3) Equisetum

80. (4) (ii) (iii) (iv) (i)

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NEET Biology 2020 Questions and Answers (61-70)

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

(1) Fungal diseases 

(2) Plant nematodes

(3) Insect predators 

(4) Insect pests

62. Meiotic division of the secondary oocyte is completed

(1) At the time of copulation

(2) After zygote formation

(3) At the time of fusion of a sperm with an ovum

(4) Prior to ovulation

63. 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.

(c) Central nervous system is dorsal and hollow.

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

(1) (c) and (a) 

(2) (a) and (b)

(3) (b) and (c)

 (4) (d) and (c)

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

Column-I                                                          Column-II

(a) Clostridium butylicum                                 (i) Cyclosporin-A

(b) Trichoderma polysporum                              (ii) Butyric Acid

(c) Monascus purpureus                                    (iii)Citric Acid

(d) Aspergillus niger                                          (iv) Blood cholesterol lowering agent

     (a) (b) (c) (d)

(1) (ii) (i) (iv) (iii)

(2) (i) (ii) (iv) (iii)

(3) (iv) (iii) (ii) (i)

(4) (iii) (iv) (ii) (i)

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

(1) Gelidium and Gracilaria

(2) Anabaena and Volvox

(3) Chlorella and Spirulina

(4) Laminaria and Sargassum

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

(1) Uremia and Renal Calculi

(2) Ketonuria and Glycosuria

(3) Renal calculi and Hyperglycaemia

(4) Uremia and Ketonuria

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

(1) Growth response

(2) Defence action

(3) Effect on reproduction

(4) Nutritive value

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

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

(2) Atrial natriuretic factor causes vasoconstriction

(3) Decrease in secretion of renin by JG cells

(4) More water reabsorption due to undersecretion of ADH

69. Select the correct match

(1) Phenylketonuria – Autosomal dominant trait

(2) Sickle cell anaemia – Autosomal recessive trait, chromosome-11

(3) Thalassemia – X linked

(4) Haemophilia – Y linked

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

(1) Natality

(2) Mortality

(3) Species interaction

(4) Sex ratio

Answers:

61. (4) Insect pests

62. (4) Prior to ovulation

63. (3) (b) and (c)

64.  (1) (ii) (i) (iv) (iii)

65. (3) Chlorella and Spirulina

66. (2) Ketonuria and Glycosuria

67. 2) Defence action

68. (1) Reabsorption of Na+ and water from renal tubules due to aldosterone

69. (2) Sickle cell anaemia – Autosomal recessive trait, chromosome-11

70. (3) Species interaction

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NEET 2020 - Biology Questions and Answers (51-60)

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

(1) Glycerol, trypsin 

(2) Cellulose, lecithin

(3) Inulin, insulin 

(4) Chitin, cholesterol

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

(1) the cockroach does not have nervous system.

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

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

(4) the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.

53. Select the correct events that occur during inspiration.

(a) Contraction of diaphragm

(b) Contraction of external inter-costal muscles

(c) Pulmonary volume decreases

(d) Intra pulmonary pressure increases

(1) (c) and (d)

(2) (a), (b) and (d)

(3) only (d)

(4) (a) and (b)

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

(1) One 

(2) Two

(3) Three 

(4) Zero

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

(1) CH3, H2, NH4 and water vapor at 800°C

(2) CH4, H2, NH3 and water vapor at 600°C

(3) CH3, H2, NH3 and water vapor at 600°C

(4) CH4, H2, NH3 and water vapor at 800°C

56.   Embryological support for evolution was disapproved by

(1) Alfred Wallace

(2) Charles Darwin

(3) Oparin

(4) Karl Ernst von Baer

57. The roots that originate from the base of the stem are

(1) Primary roots

(2) Prop roots

(3) Lateral roots

(4) Fibrous roots

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

(1) High concentration of Progesterone

(2) Low concentration of LH

(3) Low concentration of FSH

(4) High concentration of Estrogen

59. Goblet cells of alimentary canal are modified from

(1) Columnar epithelial cells

(2) Chondrocytes

(3) Compound epithelial cells

(4) Squamous epithelial cells

60. Snow-blindness in Antarctic region is due to

(1) Inflammation of cornea due to high dose of UV-B radiation

(2) High reflection of light from snow

(3) Damage to retina caused by infra-red rays

(4) Freezing of fluids in the eye by low temperature

Answers:

51. (3) Inulin, insulin 

52. (2) the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.

53. (4) (a) and (b)

54. (1) One 

55. (4) CH4, H2, NH3 and water vapor at 800°C

56. (4) Karl Ernst von Baer

57. (4) Fibrous roots

58. (4) High concentration of Estrogen

59. (1) Columnar epithelial cells

60. (1) Inflammation of cornea due to high dose of UV-B radiation

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NEET 2020 - Biology Questions and Answers (41-50)

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

Column-I                                                 Column-II

(a) Bt cotton                                           (i) Gene therapy

(b) Adenosine deaminase deficiency   (ii) Cellular defence

 (c) RNAi                                               (iii)Detection of HIV infection

(d) PCR                                                 (iv) Bacillus thuringiensis

(a) (b) (c) (d)

(1) (iii) (ii) (i) (iv)

(2) (ii) (iii) (iv) (i)

(3) (i) (ii) (iii) (iv)

(4) (iv) (i) (ii) (iii)

42. Flippers of Penguins and Dolphins are examples of

(1) Convergent evolution

(2) Industrial melanism

(3) Natural selection

(4) Adaptive radiation

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

(1) 1 molecule of 3-C compound

(2) 1 molecule of 6-C compound

(3) 1 molecule of 4-C compound and 1 molecule of 2-C compound

(4) 2 molecules of 3-C compound

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

(1) Sporozoites

(2) Female gametocytes

(3) Male gametocytes

(4) Trophozoites

45. Identify the incorrect statement.

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

(2) Sapwood is the innermost secondary xylem and is lighter in colour

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

(4) Heart wood does not conduct water but gives mechanical support

46. Which of the following is correct about viroids?

(1) They have free RNA without protein coat

(2) They have DNA with protein coat

(3) They have free DNA without protein coat

(4) They have RNA with protein coat

47. 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

(c) Filariasis (iii)Salmonella

(d) Malaria (iv) Haemophilus

    (a) (b) (c) (d)

(1) (iii) (iv) (i) (ii)

(2) (ii) (i) (iii) (iv)

(3) (iv) (i) (ii) (iii)

(4) (i) (iii) (ii) (iv)

48.  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

(1) 2.5 meters

(2) 2.2 meters

(3) 2.7 meters

(4) 2.0 meters

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

(1) 20 million 

(2) 50 million

(3) 7 million 

(4) 1.5 million

50. The QRS complex in a standard ECG represents

(1) Depolarisation of auricles

(2) Depolarisation of ventricles

(3) Repolarisation of ventricles

(4) Repolarisation of auricles

Answers:

41. (4) (iv) (i) (ii) (iii)

42. (1) Convergent evolution

43. (1) 1 molecule of 3-C compound

44. (1) Sporozoites

45. (2) Sapwood is the innermost secondary xylem and is lighter in colour

46. (1) They have free RNA without protein coat

47. (1) (iii) (iv) (i) (ii)

48. (2) 2.2 meters

49. (3) 7 million 

50. (2) Depolarisation of ventricles

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