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
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