Class 12 Biology MCQs Chapter – 2
41. Pollination occurs when a pollen grain:
(A) releases its sperms nuclei
(B) lands on stigma
(C) matures and has 3 nuclei
(D) releases its sperm nuceli and fertilize the egg and polar nuclei
Ans – (B)
42. Anemophily is pollination through :
(A) animals
(B) insects
(C) birds
(D) air
Ans – (B)
43. Entomophily is pollination through :
(A) water
(B) insects
(C) animals
(D) air
Ans – (B)
44. When the anthers and stigma in an intersexual flower mature at the same time, it is known as :
(A) allogamy
(B) dichogamy
(C) homogamy
(D) syngamy
Ans – (C)
45. Cross pollination is beneficial because it results in:
(A) formation of male offsprings
(B) weaker progeny
(C) better progeny
(D) fromation of seeds
Ans – (C)
46. The deposition of pollen grains on the stigma of another flower of the same plant is called :
(A) dichogamy
(B) geitonogamy
(C) Xenogamy
(D) hydrogamy
Ans – (B)
47. The true embryo develops as a result of fusion of :
(A) two polar nuclei of embryo sac
(B) egg cell and male gamete
(C) Synergid & male gamete
(D) Male gamete and antipodals
Ans – (B)
48. Which is not a water pollinated plants ?
(A) Zostera
(B) Vallisneria
(C) Hydrilla
(D) Cannabis
Ans – (D)
49. Spiny or Sticky pollen grains and large attractively coloured flowers are associated with :
(A) hydrophily
(B) entomophily
(C) Ornithophily
(D) anemophily
Ans – (B)
50. Male and female flowers are present on different plants to ensure Xenogamy in:
(A) papaya
(B) bottlc gourd
(C) maize
(D) all
Ans – (A)
51. Fusion of one of male gamete with egg nucleus is called :
(A) generative fertilization
(B) Syngamy
(C) Vegetative fertilization
(D) Both (A) and (B)
Ans – (D)
52. Endospermic seeds are found in :
(A) castor
(B) barley
(C) coconut
(D) all
Ans – (D)
53. Which in the following is not an endospermic seed ?
(A) Pea
(B) Castor
(C) Maize
(D) Wheat
Ans – (A)
54. The endosperm in angiosperms is :
(A) haploid
(B) diploid
(C) triploid
(D) tetraploid
Ans – (C)
55. The endosperm in gymnosperms is :
(A) haploid
(B) diploid
(C) triploid
(D) tetraploid
Ans – (A)
56. Sexual reproduction was first reported in plants by:
(A) Kolreuter
(B) Camerarius
(C) Van Beneden
(D) Nawaschin
Ans – (D)
57. In flowering plants, unisexual male of flower is called:
(A) Pistillate
(B) Monoecious
(C) Dioecious
(D) Staminate
Ans – (D)
58. The fertile part of stamen is :
(A) anther
(B) filament
(C) connective
(D) ovule
Ans – (A)
59.Flower organs have evolved from modified :
(A) leaves
(C) sporangia
(B) branches
(D) apical meristems
Ans – (A)
60. Polynology is the study of :
(A) Pollen grains
(B) Palms
(C) Flowers
(D) Fruits
Ans – (D)
