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Class 12 Biology Objective In English Chapter - 2 Sexual Reproduction in flowering plants

Class 12 Biology Objective In English Chapter – 2 Sexual Reproduction in flowering plants

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Class 12 Biology Objective In English Chapter – 2 Sexual Reproduction in flowering plants

1. Amphibians among plants belong to

 (A) Algae

 (B) Bryophytes

 (C) Fungi

 (D) Pteridophytes

Ans – (B)

2. Gynoecium is made up of

(A) Stigma

(B) Style

(C) Ovary

(D) All of above

Ans – (D)

3. The monohybrid genotypic ratio 1 2: 1 in F2 generation indicates :

(A) Segregation

(B) Independent assortment

(C) Dominance

(D) Incomplete dominance

Ans – (A)

4. In a fully developed male gametophyte the number of nuclei is :

(A) one

(B) five

(C) three

(D) four

Ans – (C)

5. If an endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in each cell of the root will be

 (A) 8

 (B) 4

 (C) 16

 (D) 24

Ans – (C)

6. The female gametophyte of a typical dicot at the time of fertilization is

(A) 8-celled

(B) 7-celled

(C) 6-celled

(D) 5-celled

Ans – (B)

7. Feathery stigma occurs in

(A) Pea

(B) Wheat

(C) Datura

(D) Caesalpinia

Ans – (D)

8. How many meiotic divisions are required for the formation of 100 functional megaspores ?

(A) 100

(B) 50

(C) 25

(D) 26

Ans – (A)

9 How many meiotic divisions are required for the formation of 100 pollen grains ?

(A) 100

(B) 50

(C) 25

(D) 26

Ans – (C)

10. Pollen grains are

 (A) megaspore

 (B ) microspore

 (C) microsporophyll

 (D) microsporangium

Ans – (B)

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11. The total number of nuclei involved in double fertilization in angiosperms are :

(A) two

(B) three

(C) four

(D) five

Ans – (D)

12. In which of the following species of plants seeds are produced through Apomixis ?

 (A) Asteraceae and grass

 (B) Mustard

 (C) Citrus and Mango

 (D)None of these

Ans – (A)

13. Pollination is the characteristic of

(A) Bryophytes and Angiosperms

(B) Peteridophytes and Angiosperms

(C) Angiosperms and Gymnosperms

(D) Angiosperms and Fungi

Ans – (C)

14. Progeny produced as a result of cross pollination :

(A) Shows high degree of variability and is evolutionary important

(B) is sterile

(C) has recessive characters

(D) is homozygous with phenotypic uniformity

Ans – (A)

15. 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)

16. Anemophily is pollination through :

(A) animals

(B) insects

(C) birds

(D) air

Ans – (B)

17. Entomophily is pollination through :

(A) water

(B) insects

(C) animals

(D) air

Ans – (B)

18. 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)

19. 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)

20 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)

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21. 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)

22. Which is not a water pollinated plants ?

 (A) Zostera

 (B) Vallisneria

 (C) Hydrilla

 (D) Cannabis

Ans – (D)

23. Spiny or Sticky pollen grains and large attractively coloured flowers are associated with :

(A) hydrophily

(B) entomophily

(C) Ornithophily

(D) anemophily

Ans – (B)

24. Male and female flowers are present on different plants to ensure Xenogamy in:

(A) papaya

(B) bottlc gourd

(C) maize

(D) all

Ans – (A)

 25. 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)

 26. Endospermic seeds are found in :

(A) castor

(B) barley

(C) coconut

(D) all

Ans – (D)

27. Which in the following is not an endospermic seed ?

(A) Pea

(B) Castor

(C) Maize

(D) Wheat

Ans – (A)

28. The endosperm in angiosperms is :

(A) haploid

(B) diploid

(C) triploid

(D) tetraploid

Ans – (C)

29. The endosperm in gymnosperms is :

(A) haploid

(B) diploid

(C) triploid

(D) tetraploid

Ans – (A)

30. Sexual reproduction was first reported in plants by:

(A) Kolreuter

(B) Camerarius

(C) Van Beneden

(D) Nawaschin

Ans – (D)

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31. In flowering plants, unisexual male of flower is called:

(A) Pistillate

(B) Monoecious

(C) Dioecious

(D) Staminate

Ans – (D)

32. The fertile part of stamen is :

 (A) anther

 (B) filament

 (C) connective

 (D) ovule

Ans – (A)

33.Flower organs have evolved from modified :

(A) leaves

(C) sporangia

(B) branches

(D) apical meristems

Ans – (A)

34. Polynology is the study of :

(A) Pollen grains

(B) Palms

(C) Flowers

(D) Fruits

Ans – (D)

35. A monothecous anther with two microsporangia is found in :

(A) Brassica

(B) Corianders

(C) Legumes

(D) Hibiscus

Ans – (A)

36. The tissue which attaches the ovules inside the ovary is :

(A) Funicle

(B) Hilum

(C) Placenta

(D) Chalaza

Ans – (C)

37. Point out the odd one :

(A) archesporium

(B) oogonium

(C) ovule

(D) antheridium

Ans – (C)

38. Mieropyle is found in

(A) ovule

(B) seeu

(C) ovule and seed both

(D) fruit

Ans – (C)

39. Female gametophyte is represented by :

(A) ovule

(B) embryo sac

(C) megaspore mother cell

(D) megasporophyll

Ans – (B)

40. The female gamete of angiosperm is represented by :

(A) egg

(B) carpel

(C) pollen grain

(D) oospore

Ans – (A)

41. The female gametophyte (embryo sac) of a typical dicot (= polygonum) at the time of fertilization is :

(A) 8-nucleated and 7-celled

(B) 7-nucleated and 8-celled

(C) 4-nucleated and 4-celled

(D) 8-nucleated and 8-celled

Ans – (A)

42. Filliform apparatus characteristic of :

(A) synergids

(B) 3g

(C)anther wall

(D lantipodal cells

Ans – (A)

43. The haploid cell which divide by mitosis to form embryo sac is :

(A) megaspore mother cell

(B) microspore mother cell

(C) functional megaspore

 (D) non-functional megaspore

Ans – (C)

44. Largest cell in the ovule is :


(B) antipodal

(C) eentral cell

(D) size of cells variable

Ans – (C)

45. When anthers and stigma in an inter sexual flower, mature at different times the condition is called:

(A) dicliny

(B) dichogamy

(C) herkogamy

(D) cleistogamy

Ans – (B)

46 Maturation of gynaecium before anthers of the same flower is :

(A) Protogyny

(B) Protandry

(C) Heterogamy

(D) Autogamy

Ans – (A)

47. A typical example of cross pollination is:

(A) Wheat

(B) Tomato

(C) Potato

(D) Maize

Ans – (D)

48 For self pollination, a flower should be :

(A) asexual

(B) monosexual

(C) unisexual

(D) bisexual

Ans – (D)

49. Anther represents :

(A) sporogonium

(B) male gametophyte

(C) male sporophyll

(D) sporangium

Ans – (C)

50. The developing pollen derives its nutrition from:

(A) tapetum

(B) endothecium

(C) middle layers


Ans – (A)

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51. Pollen grains are non-green due to

(A) absence of plastids

(B) degeneration of plastids

(C) conversion of plastids into chromoplasts

(D) attraction of vectors

Ans – (A)

52. If there are only four sporogenous cells in an anther, the number of pollen grains will be :

(A) 4

(B) 8

(C) 16

(D) 12

Ans – (C)

53. Ploidy in a pollen grain (= cyperus) is :

(A) 5n

(B) 3n

(C) n

(D) 2n

Ans – (C)

54. Pollen grains is related to embryosac as :

(A) sperm to egg

(B) male gametophyte to female gametophyte

(C) male gametophyte to egg

(D) sperm to female gametophyte

Ans – (B)

55. How many pollen mother cells will form 1000 pollen grains ?

(A) 200

(B) 250

(C) 300

(D) 100

Ans – (B)

56. The microspore mother cell in a pollensac of arnther is:

 (A) diploid

 (B) haploid

 (C) tripolid

 (D) polyptoid

Ans – (A)

 57. Pollen grain with polten tube represents :

(A) male sporophyte

(B) male gametophyte

(C) female sporophyte

(D) female gametophyte

Ans – (A)

58. How many nuclel are present in mature polten ?

(A) 1

(B) 2

(C) 3

(D) 4

Ans – (B)

59.Pollen gains are yellow due to :

(A) flavonoids and carotenoids

(B) sulphur

(C) chromoplast

(D) etiolin

Ans – (A)

60. Cytoplasm of pollen grain is rich in

(A) fat and starch

(B) protein

(C) starch and Ravonoids


Ans – (A)

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61. Cross polination is preferred over self pollination because it

(A) Produces better offspring

(B) Forms new varieties

(C) Induces parthenogenesis

(D ) ls economical

Ans – (A)

62. Anemophily occurs in………….

(A) Salvia

(B) Vallisneria

(C) Coconut

(D) Bottle brush

Ans – (C)

63. During formation of pollen grains, a microspore mother cell undergoes

(A) One meiotic division

(B) One mitotic division

(C) One meiotic and one mitotic division

(D) One meiotic and two mitotic division

 Ans – (D)

64. Which of the following will help in making early germination of pollen on stigma ?

(A) P

(B) Ca++

(C) Mo

(D) CI

Ans – (B)

65. Auxins contained in pollen grains stimulate growth of

(A) pollen tube as well as ovary

(B) only pollen tube

(C) only ovary

(D ) male gametes

Ans – (A)

66. Arrangement of nuclei in normal dicot embryo sac is :

(A) 3 + 3 + 2

(B) 2 + 3 + 3

(C) 3 + 2 + 3

(D) 2 + 4 + 2

Ans – (C)

67. Tapetum which develops into ovule is called :

(A) amoeboid tapetum

(B) glandular tapetum

(C) integumentary tapetum

(D) flagellar tapetum

Ans – (C)

68. In angiosperms, all the four microspores of a tetrad are covered by a layer formed of :

(A) cellulose

(B) sporopollenin

(C) pectose

(D) callose

Ans – (D)

69. Male gametophyte of anglosperms / monocots is :

(A) Mierosporangium

(B) Nucellus

(C) Microspore

(D) Stamen

Ans – (C)

70. In flowering plant a mature gametophyte is derived from a pollen mother cell by:

(A) 3 mitosis

(B) 1 meiosis and three mitosis

(C) 1 melosis and two mitosis

(D) singte meiosis

Ans – (C)

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71. Chemically pollen kit is made up of :

(A) proteins

(B) lipids and carotenoids

(C) carbohydrates and carotenoids

(D) sporopollenium

Ans – (B)

72. Night blooming flowers are generally

(A) Light weight

(B) Stunted

(C) Brightly coloured

(D) Bloom in clusters

Ans – (B)

73. When a flower is brightly coloured and secretes nectar, if is most probably :

(A) pollinated by wind

(B) pollinated by insects

(C) an insectivorous plants

(D) sterile flower

Ans – (B)

74. Natural parthenogenesis occurs in :

(A) Drosophila

(B) House fly

(C) Honey bee

(D) All

Ans – (C)

75. Anther is related to :

(A) formation of pollen

(B) development of pollen

(C) opening of flower bud

(D) reception of pollen by stigma

Ans – (C)

76. Formation and differentiation of pollen grains in anther is called :

(A) megasporogenesis

(B) microsporogenesis

(C) spermiogenesis

(D) double fertilization

Ans – (B)

77. A dithecous anther contains:

(A) 4 microsporangia

(B) 3 microsporangia

(C) 2 microsporangia

(D) 1 microsporangia

Ans – (A)

78. Meiosis in anther occurs in :

(A) endothecium cells

(B) pollens

(C) tapetal cells

(D) spore mother cells

 Ans – (D)

79. Pollen grains are produced in :

(A) anther

(B) stigma

(C) filament

(D) polten sac

Ans – (D)

80. The pollen is :

(A) haploid

(B) dipolid

(C) triploid

(D) tetraploid

Ans – A()

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81. Sexual of flowering plants reproduction was discovered by :

(A) Camerarius

(B) Nawaschin

(C) Strasburger

(D) Maheswari

Ans – (A)

82. Function of tapetum is

(A) Protective

(B) Nutritive

(C) Respiratory

(D ) All of the above

Ans – (B)

83. Number of chromosomes in root cell is 14. What will be the number in synergids ?

(A) 14

(B) 21

(C) 7

(D) 28

Ans – (C)

84. Proteinaceous endosperm of maize is called

(A) apophysis

(B) scutellum

(C) coleoptile

(D) aleurone layer

Ans – (D)

85. The ovary of a flower is :

(A) haploid

(B) dipolid

(C) triploid

(D) tetraploid

Ans – (B)

86. In angiosperms the fertilization occurs in :

(A) nucellus
(B) embryo sac

(C) ovary

(D) ovule

Ans – (B)

87. After fertilization, seed coats of seed develop from :

(A) embryo sac

(B) integuments

(C) ovule

(D) chalazal region

Ans – (B)

88. One of the following essential for fertilization is :

(A) Corolla  

(B) Mature ovule

(C) Calyx

(D) Fruit

Ans – (B)

89. At the time the pollen tube contains :

(A) two male gametes

(B) two male nuclei

(C) four male gametes

(D) three male gametes

Ans – (A)

90. Double fertilization is the fusion of:

(A) one egg with two sperms

(B) sperm nucleus with egg nucleus as well as with polar nuclei

(C) one male gamete with egg and other male gamete with synergid

(D) one male gamete with egg and other male gamete with secondary nucleus.

Ans – (D)

91. Double fertilization is characteristic of :

(A) dicots and monoctos/all angiosperms

(B) all Gymnosperms

(C) phanerogams

(D) Spermatophytes

Ans – (A)

92. Triple fusion is :

(A) fusion of one male gamete with two polar nuclei in the embryo sac

(B )fusion of one male gamete with three nuclei in embryo sac

(C) fusion of one male gamete with two synergids

(D )three fusions in one embryo sac

Ans – (A)

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