NEET Biology: Medical Entrance Biology Questions and Answers

Useful for Medical Entrance Exams

2017 NEET Biology Questions and Answers (31-40)

31. Which one of the following is related to Ex-situ conservation of threatened animals and plants?
 1. Wildlife Safari parks
 2. Biodiversity hot spots
 3.  Amazon rainforest
 4. Himalayan region

32. Select the mismatch
 1. Pinus  - Dioecious
 2. Cycas - Dioecious
 3. Salvinia- Homosporous
 4. Equisetum – Homosporous

33. Which of the following facilitates opening of stomatal aperture ?
1. Contraction of outer wa1l of guard cells
2. Decrease in turgidity of guard cells
3. Radial orientation of cellulose microfibril in the cell wall of guard cells
4. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

34. The association of histone H1 with a nucleosome indicates :
1. Transcription is occurring.
2. DNA replication is occurring
3. The DNA is condensed into a Chromatin  Flbre.
4.  The DNA double helix is exposed.

35. DNA fragments are:
1.  Positively charged
2. Negatively charged
3.  Neutral
4.  Either Positively or negatively charged depending on their size

36. Capacitation occurs in:
1.  Rete testis
2. Epididymis
3. Vas deferens
4.  female reproductive tract

37. Which ecosystem has the maximum biomass?
1.  Forest ecosystem
2. Grassland ecosystem
3. Pond ecosystem
4 Lake ecosystem

38. A disease caused by an autosomal primary non-disiunction is :
1. Down's  Syndrome
2. Klinefelter's Syndrome
3. Tumer's  Syndrome
4. Sickle Cell Anemia

39. Life cycle of Ectocarpus and Fucus respectively
1.  Haplontic, Diplontic
2.  diplontic, haplodiplontic
3. haplodiplontic, diplontic
4. Haplodiptontic Haplontic


40.  If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?
1. 1
2. 11
3. 33

4. 333
2017 NEET Biology Questions and Answers (31-40)
Answers:
31.  1. Wildlife Safari parks
32.  1. Pinus  - Dioecious
33. 3. Radial orientation of cellulose microfibril in the cell wall of guard cells
34. 3. The DNA is condensed into a Chromatin  Flbre.
35. 2. Negatively charged
36. 4.  female reproductive tract
37. 1.  Forest ecosystem
38. 1. Down's  Syndrome
39. 3. haplodiplontic, diplontic
40. 3. 33
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2017 NEET Biology Questions and Answers (41-50)

41. The pivot joint between atlas and axis is a type of :
1. fibrous joint
2.  cartilaginous joint
3.  synovial joint
 4. saddle joint

42. A gene whose expression helps to identify transformed cell is known as :
1. Selectable marker
2. Vector
3. Plasmid
 4. Structural gene

43. Presence of plants arranged into well defined vertic layers depending on their height can be seen be in:
1.  Tropical Savannah
2.  Tropical Rain Forest
3.  Grassland
4.  Temperate Forest
44. The genotypes of a Husband and Wife are IAIB and IAi.
Among the blood types of their children, how many o different and phenotypes are possible.
1.  3 genotypes; 3 Phenotypes
2. 3 genotypes; 4 Phenotypes
3. 4 genotypes ; 3 phenotypes
4. 4 genotypes; 4phenotypes

45.  Zygotic meiosis is characteristic of
1. Marchantia
2. Fucus
3.  Funaria
4. Chlamydomonas

46.  A Which of the following is correctly matched for the product produced by them?
1.  Acetobacter aceti: Antibioics
2.  Methanobacteium : Lactic acid
3.  Penicillium notatum: Acetic acid
4. Saccharomyces cerevisiae : Ethanol  

47. Frog's heart when taken out of the body continues to beat for sometime
Select the best option from the following statements.
a.  Frog is a poikilotherm.
b. Frog does not have any coronary circulation.
c. Heart is "myogenic" in nature.
d. Heart is autoexcitable.
 Options:
(1) oniy (c)
(2) only (d)
(3) (a) and (b)
4. (c) and (d)

48. Which statement is wrong for Krebs'cycle ?
1.There are three points in the cycle where NAD+ is reduced to NADH+ H+
2. There is one point in the cycle where FAD+ is reduced to FADH2
3. During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesized
4. The cell cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid

49. In case of poriferars, the spongocoel is lined with flagellated cells called :
1. ostia
2. oscula
3. choanocytes
4. mesenchymal cells

50. Which of the following RNAs should be most abundant in animal cell ?
1. rRNA
2. tRNA
3.  m-RNA

4 mi-RNA
2017 NEET Biology Questions and Answers
Answers:
41. 3.  synovial joint
42. 1.  Selectable marker
43. 2.  Tropical Rain Forest
44. 3. 4 genotypes ; 3 phenotypes
45. 4. Chlamydomonas
46. 4. Saccharomyces cerevisiae : Ethanol  
47. 4.  (c) and (d)
48. 4.  The cell cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid
49. 3. choanocytes
50. 1. rRNA
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NEET 2017 Biology Solved Questions (51-60)

51. Which among these are the correct combination of aquatic mammals?
1.  Seals, DolPhins, Sharks
2.  Dolphins, Seals, Trygon
3.  Whales, Dolphins, Seals
4.  Trygon, Whales, Seals

52.  With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?
1. Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation rate 
2. C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum
3. Tomato is a greenhouse crop which can be grown in CO 2 - enriched atmosphere for higher yield
4. Light saturation for CO 2 fixation occurs at 10% of full sunlight

53. Asymptote in a logistic growth curve is obtained when :
1. K = N
2.  K > N
3.  K < N
4. The value of 'r' approaches zero

54. Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:
1. X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends.
2.  X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side.
3.  X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side.
4.  X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum

55. The DNA fragments separated on an agarose gel can be visualised after staining with 
1. Bromophenol blue
2. Acetocarmine
3. Aniline blue
4. Ethidium bromide

56. Functional megaspore in an angiosperm develops into
1.Ovule
2. Endosperm
3.Embryo sac
4.Embryo

57. Among the following characters, which one was not considered by Mendel in his experiments on pea ?
1. Stem - Tall or Dwarf
2. Trichomes - Glandular or non-glandular
3. Seed - Green or Yellow
4. Pod - Inflated or Constricted

58. Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:
1. Inspiratory Reserve Volume
2. Tidal Volume
3. Expiratory Reserve Volume
4. Residual Volume

59. GnRH, a hypothalamic hormone, needed in reproduction, acts on :
1. anterior pituitary gland and stimulates secretion of LH and oxytocin.
2. anterior pituitary gland and stimulates secretion of LH and FSH.
3. posterior pituitary gland and stimulates secretion of oxytocin and FSH.
4. posterior Pituitary gland and stimulates secretion of LH and lelaxin.

60.  In Bougainvillea thorns are the modifications of:
1. Stipules
2. Adventitious root
3. Stem

4. Ieaf
NEET 2017 Biology Solved Questions
Answers: 
51. 3.  Whales, Dolphins, Seals
52. (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum
53. 1. K = N
54. 4.  X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
55. 4. Ethidium bromide
56. 3.Embryo sac
57. 2. Trichomes - Glandular or non-glandular
58. 4. Residual Volume
59. 2. anterior pituitary gland and stimulates secretion of LH and FSH.
60. 3. Stem
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NEET Biology 2017 Solved Questions (61 - 70)

61. Which one from those given below is the period for Mendel's hybridization experiments ?
1.1856-1863
2.1840 - 1850
3. 1857 - 1869
4.1870 – 1877

62. Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements.

(a) Vitamin A derivatives are formed from carotene.
(b) The photopigments are embedded in the membrane discs of the inner segment
(c) Retinal is a derivative of Vitamin A.
(d) Retinal is a light absorbing part of all the visual photopigments.
 Options :
1. (a) and (b)
2. (a), (c) and (d) ,
3. (a) and (c)
4. (b), (c) and (d)

63. Which one of the following statements is not valid for aerosols ?
1. They are harmful to human health
2. They alter rainfall and monsoon patterns 
3. They cause increased agricultural productivity
4. They have negative impact on agricultural land

64. A decrease in blood pressue/volume will not cause the release of
1. Renin
2. Atrial Natriuretic Factor
3. Aldosterone
4. ADH

65. Homozygous purelines in cattle can be obtained by:
1. mating of related individuals of same breed.
2. mating of unrelated irdividuals of same breed.
3. mating of individuals of different breed. 
4. mating of individuals of different species.

66. The vascular cambium normally gives rise to
1. Phelloderm
2. Primary phloem
3. Secondary xylem
4.Periderm

67. Which of the following statement is correct ?
1.The ascending limb of loop of Henle is  impermeable to water.
2. The descending limb of loop of Henle is impermeable to water.
3. The ascending limb of loop of Henle is permeable to water.
4. The descending limb of loop of Henle is permeable to electrolytes.

68. Fruit and leaf drop at early stages can be prevented by the application of:
1. Cytokinins
2. Ethylene
3. Auxirs
4. Gibberellic acid

69. A baby boy aged two years is admitted to play school and passes through a dental check - up. The dentist observed that the boy had twenty teeth. Which teeth were absent ?
1. Incisors
2. Canines
3. Pre-molars
4. Molars

70. An important characteristic that Hemichordates share with Chordates is :
1. absence of notochord
2. ventral tubular nerve cord 
3. Pharynx with gill slits
4. pharynx without gill slits
Answers:
61. 1. 1856-1863
62. 3. (a) and (c)
63. 3. They cause increased agricultural productivity
64. 2.  Atrial Natriuretic Factor
65. 2. mating of unrelated irdividuals of same breed.
66. 3. Secondary xylem
67. 1.The ascending limb of loop of Henle is  impermeable to water.
68. 4. Gibberellic acid
69. 3. Pre-molars
70. 3. Pharynx with gill slits
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