12th biology chapter 2 objective questions in english

1. An embryo may sometimes develop from any cell of embryo sac other than egg. It is termed as

(a) apospory

(b) apogamy

(c) parthenogenesis

(d) parthenocarpy

Ans (b)

2. Embryo sac is to ovule as _______ is to an anther.

(a) Stamen

(b) filament

(c) pollen grain

(d) androecium

Ans (c)

3. The outermost and innermost wall layers of microsporangium in an anther are respectively

(a) endothecium and tapetum

(b) epidermis and endodermis

(c) epidermis and middle layer

(d) epidermis and tapetum.

Ans (d)

4. During microsporogenesis, meiosis occurs in

(a) endothecium

(b) microspore mother cells

(c) microspore tetrads

(d) pollen grains

Ans (b)

5. From among the sets of terms given below, identify those that are associated with the gynoecium.

(a) Stigma, ovule, embryo sac, placenta

(b) Thalamus, pistil, style, ovule

(c) Ovule, ovary, embryo sac, tapetum

(d) Ovule, stamen, ovary, embryo sac

Ans (a)

6. Science of cultivation, breeding, marketing and arrangement of flowers is called

(a) arboriculture

(b) floriculture

(c) horticulture

(d) anthology

Ans (b)

7. Nonessential floral organs in a flower are

(a) sepals and petals

(b) anther and ovary

(c) stigma and filament

(d) petals only.

Ans (a)

8. The stamens represent

(a) microsporangia

(b) male gametophyte

(c) male gametes

(d) microsporophylls.

Ans (d)

9. Anther is generally

(a) monosporangiate

(b) bisporangiate

(c) letrasporangiate

(d) trisporangiate.

Ans (c)

10. The anther wall consists of four wall layers where

(a) tapetum lies just inner to endothecium

(b) middle layers lie between endothecium and tapetum

(c) endothecium lies inner to middle layers

(d) tapetum lies next to epidermis.

Ans (b)

11. The innermost layer of anther is tapetum whose function is

(a) dehiscence

(b) mechanical

(c) nutrition

(d) protection.

Ans (c)

12. Callase enzyme which dissolves callose of pollen tetrads to separate four pollens is provided by

(a) pollens

(b) tapetum

(c) middle layers

(d) endothecium.

Ans (b)

13. In angiosperms various stages of reductional division can best be studied in

(a) young anthers

(b) mature anthers

(c) young ovules

(d) endosperm cells.

Ans (a)

14. Study of pollen grains is called

(a) micrology

(b) anthology

(c) palynology

(d) pomology

Ans (c)

15. Several pollen grains form a unit designated as pollinium in Family

(a) Asteraceae

(c) Asclepiadaceae Pollen

(b) Cucurbitaceae

(d) Brassicaceae

Ans (c)

16. Triple fusion in Capsella bursa pastoris is fusion of male gamete with

(a) egg

(b) synergid

(c) secondary nucleus

(d) antipodal.

Ans (c)

17. Double fertilisation was first discovered in 1898 by _______ in Fritillaria and Lilium.

(a) Nawaschin

(b) Strasburger

(c) Amici

(d) Focke

Ans (a)

18. 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) 16

19. The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes ?

(a) 8

(b) 16

(c) 23

(d) 32

Ans (a) 8

20. Egg apparatus consists of 

(a) egg cell 

(b) synergids

(c) both egg cell and synergids

(d) antipodals

Ans (C)

21. Ruminate endosperm is found in 

(a). Asteraceae 

(b) Fabaceae

(c) Euphorbiaceae

(d) Annonaceae

Ans (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

Ans (B)

23. In which of the following plants does cleistogamy occur 

(a) Dhatura 

(b) Petunia

(c) Commelina 

(d) Gladiolus

Ans (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

Ans (B)

25. When pollination takes place by means of bees, it is called

(a) melitophily 

(b) myrmecophily

(c) ornithophily

(d) cheiropterophily

Ans (A)

26. Pollination by birds is called 

(a) entomophily

(b) myrmecophily 

(c) ornithophily

(d) cheiropterophily

Ans (C)

27. Flowers pollinated by snail and slug are called 

(a) ornithophilous

(b) cheiropterophilous 

(c) malacophilous

(d) entomophilous

Ans (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

Ans (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

Ans (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

Ans (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

Ans (B)

32. Which of the following is a true fruit? 

(a) Coconut 

(b) Apple

(c) Pear 

(d) Cashew

Ans (A)

33. The edible part in Litchi is 

(a) endosperm 

(b) mesocarp

(c) fleshy aril 

(d) pericarp

Ans (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

Ans (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

Ans (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

Ans (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

Ans (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

Ans (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

Ans (B)

40. How many pollen mother cells should undergo meiotic division to produce 64 pollen grains?

(a) 64 

(b) 32

(c) 16

(d) 8

Ans (C)

41. In a fully developed male gametophyte, the number of nuclei is

(a) one 

(b) five

(c) three 

(d) four

Ans (C)

42. The innermost layer of anther is tapetum whose function is

(a) dehiscence 

(b) mechanical

(c) nutrition 

(d) protection

Ans (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

Ans (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

Ans (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

Ans (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 

Ans (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

Ans (B)

48. Study of pollen grains is called

(a) micrology 

(b) anthology

(c) palynology 

(d) promology

Ans (C)

49. The pollen grain is a 

(a) megaspore 

(b) microspore

(c) microsporophyll

(d) microsporangium

Ans (B)

50. The stamens represent 

(a) microsporangia

(b) male gametophytes 

(c) male gametes

(d) microsporophylls

Ans (D)

51. Pollen kitt is generally found in 

(a) anemophilous flowers

(b) entomophilous flowers 

(c) ornithophilous flowers

(d) malacophilous flowers

Ans (B)

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

(a) 100 

(b) 50

(c) 25 

(d) 26

Ans (A)

53. Plant with ovaries having only one or a few ovules are generally pollinated by

(a) bees 

(b) butterflies

(c) birds 

(d) wind

Ans (D)

54. Even in the absence of pollinating agents seed-setting is assured in

(a) Commelina 

(b) Zostera

(c) Salvia 

(d) Fig

Ans (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

Ans (D)

56. The filiform apparatus is present in 

(a) synergids 

(b) egg cell

(c) antipodals 

(d) secondary nucleus

Ans (A)

57. Modified shoot with highly condensed internodes is 

(a) leaf 

(b) flower

(c) microsporophyll

(d) megasporophyll

Ans (B)

58. Anther is generally

(a) monosporangiate

(b) bisporangiate 

(c) tetrasporangiate

(d) trisporangiate

Ans (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

Ans (A)

60. Feathery stigma occurs in 

(a) Pea 

(b) Wheat

(c) Datura 

(d) Caesalpinia

Ans (B)