Class 12th Biology VVI Objective Question in English Sexual Reproduction in Flowering Plants Chapter
SEXUAL REPRODUCTION IN FLOWERING PLANTS
1. Which of the following devices is not used by plants to prevent autogamy?
(a) Self-incompatibility
(b) Production of unisexual flowers
(c) Heterostyly
(d) Production of cleistogamous flowers
| Answer ⇒ D |
2. The edible part in coconut is the endosperm. Which part of the endosperm is called liquid syncytium?
(a) Liquid endosperm in the coconut seed
(b) Endosperm meat
(c) The outermost layer of endosperm
(d) All of these
| Answer ⇒ A |
3. The scutellum is a part of
(a) grass cotyledon
(b) dicot cotyledon
(c) maize endosperm.
(d) pericarp
| Answer ⇒ A |
4. Anemophily can be best seen in
(a) sunflower
(b) maize
(c) fig
(d) yucca
| Answer ⇒ A |
5. The single shield-shaped cotyledon in monocot is called
(a) epiblast
(b) coleorhiza
(c) coleoptile
(d) scutellum
| Answer ⇒ D |
6. When anthers mature prior to maturity of stigma, it is called
(a) protogymy
(b) heterostyly
(c) dichogamy
(d) protandry
| Answer ⇒ D |
7. The fusion of male gametes with a secondary nucleus is called
(a) syngamy
(b) triple fusion
(c) geitonogamy
(d) cleistogamy
| Answer ⇒ B |
8. The process of double fertilization was discovered by
(a) Strasburger
(b) P Maheshwaring
(c) Nawaschin
(d) Amici
| Answer ⇒ C |
9. Milky water of green coconut is
(a) liquid female gametophyte
(b) secretion of seedcoat
(c) liquid endosperm.
(d) degenerated nuclear tissue
| Answer ⇒ C |
10. What would be the number of chromosomes in the aleurone layer if the megaspore mother cell contains 10 chromosomes?
(a) 10
(b) 15
(c) 20
(d) 30
| Answer ⇒ C |
11. The number of meiotic divisions required to produce 400 seeds in a pea plant is
(a) 400
(b) 500
(c) 600
(d) 800
| Answer ⇒ B |
12. When the body of the ovule becomes completely inverted towards the base of the funiculus so that the micropyle and hilum come to lie very closely, such ovules are called
(a) amphitropous
(b) anatropous
(c) hemianatropous
(d) circinotropous
| Answer ⇒ B |
13. Removal of anthers from the flower bud before the anther dehisces is called
(a) bagging
(b) artificial pollination
(c) emasculation
(d) hybridization
| Answer ⇒ C |
14. Formation of an extra embryo from the nucellus or integument is called
(a) polyspermy
(b) apomixis
(c) parthenocarpy
(d) polyembryony
| Answer ⇒ D |
15. Transfer of pollen grains from the anther to the stigma of a different plant is called
(a) xenogamy
(b) xenia
(c) geitonogamy
(d) cleistogamy
| Answer ⇒ A |
16. Which of the following is not a part of the ovule (megasporangium)?
(a) Integuments
(b) Nucellus
(c) Chalaza
(d) Endothecium
| Answer ⇒ D |
17. The process of formation of microspores from a pollen mother cell through meiosis is called
(a) megasporogenesis
(b) microsporogenesis.
(c) microgametogenesis
(d) megagametogenesis
| Answer ⇒ B |
18. Which one is not a part of the anther wall?
(a) Endothecium
(b) Endothelium
(c) Tapetum
(d) Middle layers
| Answer ⇒ B |
19. Pollen grains are well preserved as fossils because of the presence of
(a) sporopollenin
(b) thin exine
(c) thick intine
(d) spiny exine
| Answer ⇒ A |
20. Egg apparatus consists of
(a) egg cell
(b) synergids
(c) both egg cell and synergids
(d) antipodals
| Answer ⇒ C |
21. Ruminate endosperm is found in
(a). Asteraceae
(b) Fabaceae
(c) Euphorbiaceae
(d) Annonaceae
| Answer ⇒ D |
22. Plants of which one of the following groups of genera are pollinated by the same agency?
(a) ‘Ficus, Bombax, Casuarina
(b) Triticum, Phoenix, Zea
(b) Kigelia, Yucca, Cocos
(d) Salvia, Jatropha, Morus
| Answer ⇒ B |
23. In which of the following plants does cleistogamy occur
(a) Dhatura
(b) Petunia
(c) Commelina
(d) Gladiolus
| Answer ⇒ C |
24. When pollination takes place between two flowers on the same plant, the process is known as
(a) xenogamy
(b) geitonogamy
(c) porogamy
(d) entomophily
| Answer ⇒ B |
25. When pollination takes place by means of bees, it is called
(a) melitophily
(b) myrmecophily
(c) ornithophily
(d) cheiropterophily
| Answer ⇒ A |
26. Pollination by birds is called
(a) entomophily
(b) myrmecophily
(c) ornithophily
(d) cheiropterophily
| Answer ⇒ C |
27. Flowers pollinated by snail and slug are called
(a) ornithophilous
(b) cheiropterophilous
(c) malacophilous
(d) entomophilous
| Answer ⇒ C |
28. Syngamy refers to the fusion of one of the sperm with
(a) egg
(b) synergids
(c) secondary nucleus
(d) egg and the other secondary nucleus
| Answer ⇒ A |
29. The endosperm cell of an angiosperm has the chromosomes. The number of chromosomes in the gametes would be
(a) 8
(b) 16
(c) 24
(d) 48
| Answer ⇒ A |
30. Aleurone layer is present in
(a) cotyledons
(b) the peripheral part of scutellum
(b) the outermost layer of endosperm
(d) the peripheral part of coleoptile
| Answer ⇒ C |
31. Which of the following is not correct about pome?
(a) True fruit remains inside the swollen thalamus
(b) Fruit develops from an apocarpous, superior ovary
(c) Seeds develop inside the locules
(d) Wall of the ovary is thin like a paper
| Answer ⇒ B |
32. Which of the following is a true fruit?
(a) Coconut
(b) Apple
(c) Pear
(d) Cashew
| Answer ⇒ A |
33. The edible part in Litchi is
(a) endosperm
(b) mesocarp
(c) fleshy aril
(d) pericarp
| Answer ⇒ C |
34. The outer wall (exine) of a pollen grain is composed of one of the most resistant biological materials, known as
(a) tannin
(b) pectocellulose
(c) sporopollenin
(d) lignin
| Answer ⇒ C |
35. When the body of the ovule, embryo sac, micropyle and funicle, all lie in one straight plane, the ovule is known as
(a) orthotropous
(b) amphitropous ic anatropous
(d) campylotropous
| Answer ⇒ A |
36. When the ovule is curved, and along with the ovule the embryo sac becomes horse-shoe shaped, such an ovule is called
(a) anatropous
(b) circinotropous
(c) amphitropous
(d) orthotropous
| Answer ⇒ C |
37. The embryo sac is called monosporic when it develops from
(a) all the four megaspores
(b) two functional megaspores only
(c) three micropylar megaspores only
(d) one of the four megaspores which becomes functional
| Answer ⇒ D |
38. When the pollen grains are transferred by the agency of air, this type of pollination is called
(a) anemophily
(b) entomophily
(c) ornithophily
(d) myrmecophily
| Answer ⇒ A |
39. The female gametophyte of a typical dicot is also called Polygonum type of embryo sac. At the time of fertilization, mature embryo sac is
(a) 7-celled, 7-nucleate
(b) 7-celled, 8-nucleate,
(c) 8-celled, 7-nucleate
(d) 8-celled, 8-nucleate
| Answer ⇒ B |
40. How many pollen mother cells should undergo meiotic division to produce 64 pollen grains?
(a) 64
(b) 32
(c) 16
(d) 8
| Answer ⇒ C |
41. In a fully developed male gametophyte, the number of nuclei is
(a) one
(b) five
(c) three
(d) four
| Answer ⇒ C |
42. The innermost layer of anther is tapetum whose function is
(a) dehiscence
(b) mechanical
(c) nutrition
(d) protection
| Answer ⇒ C |
43. When micropyle, chalaza, and hilum lie in a straight line, the ovule is said to be
(a) anatropous
(b) orthotropous
(C) amphitropous
(d) campylotropous
| Answer ⇒ B |
44. In female gametophyte of a typical dicot at the time of fertilization is
(a) 8-celled
(b) 7-celled
(c) 6-celled
(d) 5-celled
| Answer ⇒ B |
45. Polygonum type of embryo sac is
(a) 8-nucleate, 7-celled
(b) 8-nucleate. 8-celled
(C) 7-nucleate, 7-celled
(d) 7-nucleate, 3 celled
| Answer ⇒ A |
46. One of the most resistant biological material present in the exine of the pollen grain is
(a) pectocellulose
(b) sporopollenin
(c) suberin
(d) cellulose
| Answer ⇒ B |
47. Callas enzyme which dissolves callose of pollen tetrads to separate four pollen is provided by
(a) pollens
(b) tapetum
(c) middle layers
(d) endothecium
| Answer ⇒ B |
48. Study of pollen grains is called
(a) micrology
(b) anthology
(c) palynology
(d) promology
| Answer ⇒ C |
49. The pollen grain is a
(a) megaspore
(b) microspore
(c) microsporophyll
(d) microsporangium
| Answer ⇒ B |
50. The stamens represent
(a) microsporangia
(b) male gametophytes
(c) male gametes
(d) microsporophylls
| Answer ⇒ D |
51. Pollen kitt is generally found in
(a) anemophilous flowers
(b) entomophilous flowers
(c) ornithophilous flowers
(d) malacophilous flowers
| Answer ⇒ B |
52. How many meiotic divisions are required for the formation of 100 functional megaspores ?
(a) 100
(b) 50
(c) 25
(d) 26
| Answer ⇒ A |
53. Plant with ovaries having only one or a few ovules are generally pollinated by
(a) bees
(b) butterflies
(c) birds
(d) wind
| Answer ⇒ D |
54. Even in the absence of pollinating agents seed-setting is assured in
(a) Commelina
(b) Zostera
(c) Salvia
(d) Fig
| Answer ⇒ A |
55. During the process of fertilization, the pollen tube of the pollen grain usually enters the embryo sac through
(a) integument
(b) nucleus
(c) chalaza
(d) micropyle
| Answer ⇒ D |
56. The filiform apparatus is present in
(a) synergids
(b) egg cell
(c) antipodals
(d) secondary nucleus
| Answer ⇒ A |
57. Modified shoot with highly condensed internodes is
(a) leaf
(b) flower
(c) microsporophyll
(d) megasporophyll
| Answer ⇒ B |
58. Anther is generally
(a) monosporangiate
(b) bisporangiate
(c) tetrasporangiate
(d) trisporangiate
| Answer ⇒ C |
59. In angiosperms, various stages of reductional division can best be studied in
(a) young anthers
(b) mature anthers
(c) young ovules
(d) endosperm cells
| Answer ⇒ A |
60. Feathery stigma occurs in
(a) Pea
(b) Wheat
(c) Datura
(d) Caesalpinia
| Answer ⇒ B |
61. Part of the gynoecium which receives the pollen is called
(a) style
(b) stigma
(c) ovule
(d) ovary
| Answer ⇒ B |
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