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

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

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)

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

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

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

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)

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

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

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)

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

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

Q58. The ovary is half inferior in :

1. Brinjal

2. Mustard

3. Sunflower

4. Plum

4. Plum

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

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)

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

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)

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

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

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

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

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

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

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

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)