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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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