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Chart & Stethoscope

BIOLOGY NEET - 2020
SOLUTIONS

Q46. By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams?

1. Out crossing

2. Mutational breeding

3. Cross breeding

4. Inbreeding

3. Cross breeding

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Q47. Identify the correct statement with reference to human digestive system.

1. Ileum opens into small intestine

2. Serosa is the innermost layer of the alimentary canal

3. Ileum is a highly coiled part

4. Vermiform appendix arises from duodenum

3. Ileum is a highly coiled part

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Q48. Match the following columns and select the correct option.

Column-I
(a) Clostridium butylicum
(b) Trichoderma polysporum
(c) Monascus Purpureus
(d) Aspergillus niger

Column-II
(i) Cyclosporin-A
(ii) Butyric Acid
(iii) Citric Acid
(iv) Blood cholesterol lowering agent

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

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

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

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

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

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Q49. Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?

1. Uremia and Ketonuria

2. Uremia and Renal Calculi

3. Ketonuria and Glycosuria

4. Renal calculi and Hyperglycaemia

3. Ketonuria and Glycosuria

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Q50. Floridean starch has structure similar to

1. Starch and cellulose

2. Amylopectin and glycogen

3. Mannitol and algin

4. Laminarin and cellulose

2. Amylopectin and glycogen

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Q51. Select the option including all sexually transmitted diseases.

1. Gonorrhoea, Syphilis, Genital herpes

2. Gonorrhoea, Malaria, Genital herpes

3. AIDS, Malaria, Filaria

4. Cancer, AIDS, Syphilis

1. Gonorrhoea, Syphilis, Genital herpes

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Q52. Match the following with respect to meiosis

Column-I
a. Zygotene
b. Pachytene
c. Diplotene
d. Diakinesis

Column-II
i. Terminalization
ii. Chiasmata
iii. Crossing over
iv. Synapsis

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

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

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

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

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

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Q53. Which of the following pairs is of unicellular algae?

1. Laminaria and Sargassum

2. Gelidium and Gracilaria

3. Anabaena and Volvox

4. Chlorella and Spirulina

4. Chlorella and Spirulina

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Q54. Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?

1. High concentration of Estrogen

2. High concentration of Progesterone

3. Low concentration of LH

4. Low concentration of FSH

1. High concentration of Estrogen

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Q55. Match the following columns and select the correct option.

Column-I
a. Bt cotton
b. Adenosone deaminase deficiency
c. RNAi
d. PCR

Column-II
i. Gene therapy
ii. Cellular defense
iii. Detection of HIV infection
iv. Bacillus thuringiensis

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

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

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

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

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

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Q56. Montreal Protocol was signed in 1987 for control of

1. Transport of Genetically modified organisms from one country to another

2. Emission of ozone-depleting substances

3. Release of Green House gases

4. Disposal of e-wastes

2. Emission of ozone-depleting substances

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Q57. Which of the following is correct about viroids?

1. They have RNA with protein coat

2. They have free RNA without protein coat

3. They have DNA with protein coat

4. They have free DNA without protein coat

2. They have free RNA without protein coat

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Q58. The ovary is half inferior in :

1. Brinjal

2. Mustard

3. Sunflower

4. Plum

4. Plum

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Q59. The enzyme enterokinase helps in conversion of

1. protein into polypeptides

2. trypsinogen into trypsin

3. caseinogen into casein

4. pepsinogen into pepsin

2. trypsinogen into trypsin

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Q60. Match the trophic levels with their correct species examples in grassland ecosystem.

Column-I
a. Fourth trophic level
b. Second trophic level
c. First trophic level
d. Third trophic level

Column-II
i. Crow
ii. Vulture
iii. Rabbit
iv. Grass

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

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

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

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

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

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Q61. How many true breeding pea plant varieties did Mendel select as pairs, which were similar
except in one character with contrasting traits?

(1) 4

(2) 2

(3) 14

(4) 8

(3) 14

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Q62. Match the following columns and select the correct option.

Column-I
a. Organ of Corti
b. Cochlea
c. Eustachian tube
d. Stapes

Column-II
(i) Connects middle ear and pharynx
(ii) Coiled part of the labyrinth
(iii) Attached to the oval window
(iv) Located on the basilar membrane

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

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

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

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

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

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Q63. In water hyacinth and water lily, pollination takes place by :

1. Insects or wind

2. Water currents only

3. Wind and water

4. Insects and water

1. Insects or wind

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Q64. Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of the stem, thus increasing the yield of sugarcane crop.

1. Cytokinin

2. Gibberellin

3. Ethylene

4. Abscisic acid

2. Gibberellin

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Q65. In light reaction, plastoquinone facilitates the transfer of electrons from

1. PS-II to Cytb6f complex

2. Cytb6f complex to PS-I

3. PS-I to NADP+

4. PS-I to ATP synthase

1. PS-II to Cytb6f complex

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Q66. Which of the following is not an inhibitory substance governing seed dormancy?

1. Gibberellic acid

2. Abscisic acid

3. Phenolic acid

4. Para-ascorbic acid

1. Gibberellic acid

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Q67. Name the enzyme that facilitates the opening of DNA helix during transcription.

1. DNA ligase

2. DNA helicase

3. DNA polymerase

4. RNA polymerase

4. RNA polymerase

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Q68. Which of the following would help in prevention of diuresis?

1. More water reabsorption due to undersecretion of ADH

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

3. Atrial natriuretic factor causes vasoconstriction

4. Atrial natriuretic factor causes vasoconstriction

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

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Q69. 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 less than net primary productivity

2. Gross primary productivity is always more than net primary productivity

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

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

2. Gross primary productivity is always more than net primary productivity

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Q70. Match the following columns and select the correct option.

Column-I
(a) Placenta
(b) Zona Pellucida
(c) Bulbo-urethral glands
(d) Leydig cells

Column-II
(i) Androgen
(ii) Human Chorionic Gonadotropin (hCG)
(iii) Layer of the ovum
(iv) Lubrication of the penis

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

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

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

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

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

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Q71. Strobili or cones are found in

1. Salvinia

2. Pteris

3. Marchantia

4. Equisetum

4. Equisetum

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Q72. Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of

1. M phase

2. G1 phase

3. S phase

4. G2 phase

1. M phase

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Q73. Flippers of Penguins and Dolphins are examples of

1. Adaptive radiation

2. Convergent evolution

3. Industrial melanism

4. Natural selection

2. Convergent evolution

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Q74. 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) 2.0 meters

(2) 2.5 meters

(3) 2.2 meters

(4) 2.7 meters

(3) 2.2 meters

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Q75. The QRS complex in a standard ECG represents

1. Repolarisation of auricles

2. Depolarisation of auricles

3. Depolarisation of ventricles

4. Repolarisation of ventricles

3. Depolarisation of ventricles

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Q76. Match the following columns and select the correct option.

Column-I
(a) Eosinophils
(b) Basophils
(c) Neutrophils
(d) Lymphocytes

Column-II
(i) Immune response
(ii) Phagocytosis
(iii) Release histamine, destructive enzymes
(iv) Release granules containing histamine

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

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

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

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

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

View solution

Q77. Which of the following statements is correct?

1. Adenine pairs with thymine through two H-bonds

2. Adenine pairs with thymine through one H-bond

3. Adenine pairs with thymine through three H-bonds

4. Adenine does not pair with thymine

1. Adenine pairs with thymine through two H-bonds

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Q78. The sequence that controls the copy number of the linked DNA in the vector, is termed

1. Selectable marker

2. Ori site

3. Palindromic sequence

4. Recognition site

2. Ori site

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Q79. Identify the basic amino acid from the following.

1. Tyrosine

2. Glutamic acid

3. Lysine

4. Valine

3. Lysine

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Q80. Match the following columns and select the correct option.

Column-I
(a) Pituitary gland
(b) Thyroid gland
(c) Adrenal gland
(d) Pancreas

Column-II
(i) Grave’s disease
(ii) Diabetes mellitus
(iii) Diabetes insipidus
(iv) Addison’s disease

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

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

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

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

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

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Q81. Select the correct statement.

1. Glucocorticoids stimulate gluconeogenesis.

2. Glucagon is associated with hypoglycemia.

3. Insulin acts on pancreatic cells and adipocytes.

4. Insulin is associated with hyperglycemia.

1. Glucocorticoids stimulate gluconeogenesis.

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Q82. Which one of the following is the most abundant protein in the animals?

1. Haemoglobin

2. Collagen

3. Lectin

4. Insulin

2. Collagen

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Q83. Experimental verification of the chromosomal theory of inheritance was done by

1. Mendel

2. Sutton

3. Boveri

4. Morgan

4. Morgan

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Q84. Match the following columns and select the correct option.

Column-I
(a) Floating ribs
(b) Acromion
(c) Scapula
(d) Glenoid cavity

Column-II
(i) Located between second and seventh ribs
(ii) Head of the humerus
(iii) Clavicle
(iv) Do not connect with the sternum

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

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

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

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

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

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Q85. The number of substrate-level phosphorylations in one turn of citric acid cycle is

1. zero

2. One

3. Two

4. Three

2. One

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Q86. Dissolution of the synaptonemal complex occurs during

1. Pachytene

2. Zygotene

3. Diplotene

4. Leptotene

3. Diplotene

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Q87. Bilaterally symmetrical and acoelomate animals are exemplified by

1. Ctenophora

2. Platyhelminthes

3. Aschelminthes

4. Annelida

2. Platyhelminthes

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Q88. The body of the ovule is fused within the funicle at

1. Hilum

2. Micropyle

3. Nucellus

4. Chalaza

1. Hilum

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Q89. Goblet cells of the alimentary canal are modified from

1. Squamous epithelial cells

2. Columnar epithelial cells

3. Chondrocytes

4. Compound epithelial cells

2. Columnar epithelial cells

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Q90. Snow-blindness in Antarctic region is due to

1. Freezing of fluids in the eye by low temperature

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

3. High reflection of light from snow

4. Damage to retina caused by infra-red rays

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

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