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Sexual Reproduction in flowering plants Mcqs Pyqs For Neet Examination

Get the Questions and answers of Sexual reproduction in plants and previous questions for the preparation if Neet 2020-2021.

Subtopics of sexual reproduction in flowering plants

* Pre-fertilization structures and events

* Double fertilization 

* Post fertilization  structures and events

* Apomixis and polyembryony

Pre-fertilization structures and events

1. Generative cell was destroyed by laser but a normal pollen tube was still formed because.

(A) vegetative cell is not damaged.
(B) contents of killed generative cell stimulate pollen growth.
(C). laser beam stimulates growth of pollen tube.
(D) the region of emergence of pollen tube
is not harmed.

2. Male gametophyte of angiosperms/monocots is

(A) microsporangium
(B) nucellus
(C) microspore
(D) stamen

3. Female gametophyte of angiosperms is represented by

(A) ovule
(B) megaspore mother cell
(C) embryo sac
(D) nucellus

4. Embryo sac occurs in

(A) embryo
(B) axis part of embryo
(C) ovule
(D) endosperm

5. Which of the following pair have haploid structures?

(A) Nucellus and antipodal cells
(B) Antipodal cells and egg cell
(C) Antipodal cells and megaspore mother
cell
(D) Nucellus and primary endosperm
nucleus

6. Point out the ODD one.

(A) Nucellus
(B) Embryo sac
(C) Micropyle
(D) Pollen grain

7. Embryo sac represents

(A) megaspore
(B) megagametophyte
(C) megasporophyll
(D) megagamete

8. When pollen of a flower is transferred to the stigma of another flower of the same plant, the pollination is referred to as

(A) autogamy
(B) geitonogamy
(C) xenogamy
(D) allogamy

9. In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?

(A) 75
(B) 100
(C) 25
(D) 50

10. If there are 4 cells in anthers, what will be the number of pollen gains?

(A) 16
(B) 12
(C) 8
(D) 4

11. What is the direction of micropylo in anatropous ovule?

(A) Upward
(B) Downward
(C) Right
(D) Len

12. In angiosperms pollen tube liberate their malo gametes into the

(A) central cell
(B) antipodal cells
(C) egg cell
(D) synergids

13. Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

(A) Egg cell
(B) Persistent synergid
(C) Degenerated synergids
(D) Central cel

14. The arrangement of the nuclei in a normal embryo sac in the dicot plants is

(A) 3+ 3 + 2
(B) 2 +4 + 2
(C) 3 + 2 + 3
(D) 2+ 3+3

15. In gymnosperms, the pollen chamber represents

(A) a cavity in the ovule in which pollen grains are stored after pollination
(B) an opening in the megagametophyte through which the pollen tube approaches the egg
(C) the microsporangium in which pollen grains develop
(D)a cell in the pollen grain in which the sperms are formed.

16. Which one of the following is surrounded by a callose wall?

(A) Male gamete
(B) Egg
(C) Pollen grain
(D) Microspore mother cell

17. Two plants can be conclusively said to belong to the same species if they

(A) have more than 90 percent similar genes (B) look similar and possess identical secondary
metabolites
(C) have same number of chromosomes
(D) can reproduce freely with each other
and form seeds

18. Male gametes in angiosperms are formed by the division of

(A)generative cell
(B)vegetative cell
(C)microspore mother cell
(D)microspore

19. Which one of the following is resistant to enzyme action?

(A) Pollen exine
(B) Leaf cuticle
(C) Cork
(D) Wood fibre

20.What does the filiform apparatus do at the entrance into ovule?

(A) It brings about opening of the pollen tube.
(B) It guides pollen tube from a synergid to
egg
(C) It helps in the entry of pollen tube into a
synergid.
(D) It prevents entry of more than one
pollen tube into the embryo sac

21. Which one of the following pairs of plant structures has haploid number of chromosomes?

(A) Nucellus and antipodal cells
(B) Egg nucleus and secondary nucleus
(C) Megaspore mother cell and antipodal cells
(D) Egg cell and antipodal cells

23. Wind pollinated flowers are

(A) small, brightly coloured, producing large number of pollen grains
(B) small, producing large number of dry pollen grains
(C) large producing abundant nectar and pollen
(D) small, producing nectar and dry pollen

24. Transfer of pollen grains from the anther to the stigma of another flower of the same plant is
called

(A) xenogamy
(B) geitonogamy
(C) karyogamy
(D) autogamy

25. In angiosperms, functional megaspore
develops into

(A) embryo sac
(B) ovule
(C) endosperm
(D) pollen sac

26. Wind pollination is common in

(A) legumes
(B) lilies
(C) grasses
(D) orchids

27. Which one of the following pollinations is autogamous?

(A) Geitonogamy
(B) Xenogamy
(C) Chasmogamy
(D) Cleistogamy

28. Filiform apparatus is a characteristic feature of

(A) suspensor
(B) egg
(C) synergid
(D) zygote

29. Which one of the following statements WRONG?

(A) When pollen is shed at two-celled stage, double fertilization does not take place.
(B) Vegetative cell is larger than generative cell.
(C) Pollen grains in some plants remain viable for months.
(D) Intine is made up of cellulose and pectin.

30. What is the function of germ pore?

(A) Emergence of radicle 30.
(B) Absorption of water for seed germination
(C) Initiation of pollen tube
(D) Release of male gametes

31. Plants with ovaries having only one or a few ovules, are generally pollinated by

(A) bees
(B) butterflies
(C) birds
(D) wind

32. Even in absence of pollinating agents seedsetting is assured in

(A) Commelina
(B) Zostera
(C) Salvia
(D) fig

33. An organic substance that can withstand environmental extremes and cannot be degraded
by any enzyme is

(A) cuticle
(B) sporopollenin
(C) lignin
(D) cellulose

34. Both, autogamy and geitonogamy are prevented in

(A) papaya
(B) cucumber
(C) castor
(D) maize

35. The gynoccium consists of many free pistils in flower of

(A) Aloe
(B) tomato
(C) Papaver
(D) Michelia

36. Which one of the following statements iscorrect?

(A) Hard outer layer of pollen is called intine
(B) Sporogenous tissue is haploid
(C) Endothecium produces the microspores 
(D) Tapetum nourishes the developing pollen

37. Advantage of cleistogamy is

(A) higher genetic variability
(B) more vigorous offspring
(C) no dependence on pollinators
(D) vivipary

38. Function of filiform apparatus is to

(A) recognize the suitable pollen at stigma 
(B) stimulate division of generative cell
(C) produce nectar
(D) guide the entry of pollen tube

39. Pollen tablets are available in the market for

(A) in vitro fertilization
(B) breeding programmes
(C) supplementing food
(D) ex situ conservation

40. An aggregate fruit is one which develops from

(A) multicarpellary syncarpous gynoecium 
(B) multicarpellary apocarpus gynoecium 
(C) complete inflorescence
(D) multicarpellary superior ovary

41. Geitonogamy involves

(A) fertilization of a flower by the pollen
from another flower of the same plant.
(B) fertilization of a flower by the pollen from the same flower.
(C) fertilization of a flower by the pollen from a flower of another plant in the same population.
(D) fertilization of a flower by the pollen from flower of another plant belonging to a distant
population.

42. Which one of the following statements
is NOT true?

(A) Pollen grains are rich in nutrients, and they are used in the form of tablets and syrups.
(B) Pollen grains of some plants cause severe allergies and bronchial afflictions in some people.
(C) The flowers pollinated by flies and bats secrete foul odour to attract them.
(D) Honey is made by bees by digesting pollen collected from flowers.

43. Which one of the following may require pollinators, but is genetically similar to autogamy?

(A) Geitonogamy
(B) Xenogamy
(C) Apogamy
(D) Cleistogamy

44. Which of the following are the important floral rewards to the animal pollinators?

(A) Colour and large size of flower
(B) Nectar and pollen grains
(C) Floral fragrance and calcium crystals
(D) Protein pellicle and stigmatic
exudates

45. Flowers are unisexual in

(A) China rose
(B) onion
(C) pea
(D) cucumber

46. Male gametophyte in angiosperms produces

(A) three sperms
(B) two sperms and a vegetative cell
(C) single sperm and a vegetative cell
(D) single sperm and two vegetative cell

47. In angiosperms, microsporogenesis and megasporogenesis

(A) occur in ovule
(B) occur in anther
(C) form gametes without further divisions 
(D) involve meiosis

48. Filiform apparatus is characteristic feature of

(A) synergids
(B) generative cell
(C) nucellar embryo
(D) aleurone cell

49. Which of the following statements is NOT correct?

(A) Pollen germination and pollen tube growth are regulated by chemical components of pollen
interacting with those of the pistil.
(B) Some reptiles have also been reported as pollinators in some plant species.
(C) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen
tube of the same species grows into the style.
(D) Insects that consume pollen or nectar without bringing about pollination are called
pollen/nectar robbers.

50. Which one of the following statements is NOT true?

(A) Pollen grains of many species cause severe allergies.
(B) Stored pollen in liquid nitrogen can be used in the crop breeding programmes.
(C) Tapetum helps in the dehiscence of anther.
(D) Exine of pollen grains is made up of sporopollenin.

51. Proximal end of the filament of stamen is attached to the

(A) placenta
(B) thalamus or petal
(C) anther
(D) connective

52. The ovule of an angiosperm is technically equivalent to

(A) megaspore
(B) megasporangium
(C) megasporophyll
(D) megaspore mother cell

53. Pollination in water hyacinth and water lily is brought about by the agency of

(A) bats
(B) water
(C) insects or wind
(D) birds

54. In majority of angiosperms

(A) a small central cell is present in the embryo sac
(B) egg has a filiform apparatus
(C) there are numerous antipodal cells
(D) reduction division in occurs
the megaspore mother cells

55. A dioecious flowering plant prevents both:

(A) Autogamy and xenogamy
(B) Autogamy and geitonogamy
(C) Geitonogamy and Xenogamy
(D) Cleistogamy and xenogamy

56. Flowers which have single ovule in the ovary and are packed into inflorescence are usually
pollinated by

(A) water
(B) bee
(C) wind
(D) bat

57. Attractants and rewards are required for

(A) anemophily
(B) entomophily
(C) hydrophily
(D) cleistogamy

58. Functional megaspore in an angiosperm develops into

(A) ovule
(B) endosperm
(C) embryo sac
(D) embryo

59. Which one of the following plants shows a very close relationship with a species of moth,
where none of the two can complete its life cycle without the other?

(A) Banana
(B) Yucca
(C) Hydrilla
(D) Viola

60. Winged pollen grains are present in

(A) Mango
(B) Cycas
(C) Mustard
(D) pinus

61. Pollen grains can be stored for several years in liquid nitrogen having a temperature of

(A) -196°C
(B) -80°C
(C) -120°C
(D) -160°C

62. Which of the following has proved helpful in preserving pollen as fossils?

(A) Oil contentintine
(B) Cellulosic
(C) Pollenkitt
(D) Sporopollenin

63. Which is the most common type of embryo sac in angiosperms?

(A) Bisporic with two sequential mitotic divisions
(B) Tetrasporic with one mitotic stage of divisions
(C) Monosporic with three sequential mitotic divisions
(D) Monosporic with two sequential mitotic divisions

64. In which one of the following, both autogamy and geitonogamy are prevented?

(A) Maize
(B) Wheat
(C) Papaya
(D) Castor

65. What type of pollination takes place in Vallisneria?

(A) Male flowers are carried by water currents to female flowers at surface of water.
(B) Pollination occurs in submerged condition by water.
(C) Flowers emerge above surface of water and pollination occurs by insects.
(D) Flowers emerge above water surface and pollen is carried by wind.

66. In water hyacinth and water lily, pollination takes place by:

(A) water currents only
(B) wind and water
(C) insects and water
(D) insects or wind

67. The plants parts which consist of two generations one within the other:
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male
gametes
(c) Seeds inside the fruit
(d) Embryo sac inside the ovule

(A) (a), (b) and (c)
(B) (c) and (d)
(C) (a) and (d)
(D) (a) only