Flower Reproduction Chapter 2 PDF

Sexual Reproduction In Flowering Plants MCQ Class 12 Question 1. What is the function of filiform apparatus in an angiospermic embryo sac? (a) Brings about opening of the pollen tube (b) Guides the pollen tube into a synergid (c) Prevents entry of more than one pollen tube into a synergid (d) None o...

Sexual Reproduction In Flowering Plants MCQ Class 12 Question 1. What is the function of filiform apparatus in an angiospermic embryo sac? (a) Brings about opening of the pollen tube (b) Guides the pollen tube into a synergid (c) Prevents entry of more than one pollen tube into a synergid (d) None of these Answer: (b) Guides the pollen tube into a synergid Sexual Reproduction In Flowering Plants Class 12 MCQ Question 2. The female gametophyte of a typical dicot at the time of fertilisation is (a) 8 – celled (b) 7 – celled (c) 6 – celled (d) 5 – celled Answer: (b) 7 – celled Class 12 Biology Chapter 2 MCQ Question 3. Polygonum type of embryo sac is (a) 8 – nucleate, 7 – celled (b) 8 – nucleate, 8 – celled (c) 7 – nucleate, 7 – celled (d) 4 – nucleate, 3 – celled Answer: (a) 8 – nucleate, 7 – celled Reproduction In Flowering Plants Class 12 MCQ Chapter 2 Question 4. Both chasmogamous and cleistogamous flowers are present in (a) Helianthus (b) Commelina (c) Rosa (d) Gossypium Answer: (b) Commelina MCQ On Sexual Reproduction In Flowering Plants Class 12 Question 5. Even in absence of pollinating agents seed-setting is assured in (a) Commelina (b) Zostera (c) Salvia (d) Fig Answer: (a) Commelina Chapter 2 Biology Class 12 MCQs Question 6. Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in (a) papaya (b) bottle gourd (c) maize (d) all of these. Answer: (a) papaya MCQ Of Sexual Reproduction In Flowering Plants Class 12 Question 7. Feathery stigma occurs in (a) pea (b) wheat (c) Datura (d) Caesalpinia Answer: (b) wheat Ch 2 Bio Class 12 MCQ Question 8. Plants with ovaries having only one or a few ovules are generally pollinated by (a) bees (b) butterflies (c) birds (d) wind Answer: (d) wind Class 12 Bio Chapter 2 MCQ Question 9. Which of the following is not a water pollinated plant ? (a) Zostera (b) Vallisneria (c) Hydrilla (d) Cannabis Answer: (d) Cannabis MCQ Questions For Class 12 Biology Chapter 2 Question 10. Spiny or sticky pollen grains and large, attractively coloured flowers are associated with (a) hydrophily (b) entomophily (c) ornithophily (d) anemophily Answer: (b) entomophily Biology Class 12 Chapter 2 MCQs Question 11. Endospermic seeds are found in (a) castor (b) barley (c) coconut (d) all of these Answer: (d) all of these Class 12 Bio Ch 2 MCQ Question 12. In albuminous seeds, food is stored in _______ and in non albuminous seeds, it is stored in _______. (a) endosperm, cotyledons (b) cotyledons, endosperm (c) nucellus, cotyledons (d) endosperm, radicle Answer: (a) endosperm, cotyledons Sexual Reproduction In Flowering Plants MCQ Questions Class 12 Question 13. Persistent nucellus is called as _______ and is found in _______. (a) perisperm, black pepper (b) perisperm, groundnut ‘ (c) endosperm, black pepper (d) endosperm groundnut Answer: (a) perisperm, black pepper Chapter 2 Bio Class 12 MCQ Question 14. Indentify the wrong statement regarding post-fertilisation development. (a) The ovary wall develops into pericarp. (b) The outer integument of ovule develops into tegmen. (c) The fusion nucleus (triple nucleus) develops into endosperm. (d) The ovule develops into seed. Answer: (b) The outer integument of ovule develops into tegmen. Chapter 2 Biology Class 12 MCQ Question 15. Polyembryony commonly occurs in (a) banana (b) tomato (c) potato (d) citrus. Answer: (d) citrus. Question 16. 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 Answer: (b) apogamy Question 17. Embryo sac is to ovule as _______ is to an anther. (a) Stamen (b) filament (c) pollen grain (d) androecium Answer: (c) pollen grain Question 18. 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. Answer: (d) epidermis and tapetum. Question 19. During microsporogenesis, meiosis occurs in (a) endothecium (b) microspore mother cells (c) microspore tetrads (d) pollen grains Answer: (b) microspore mother cells Question 20. 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 Answer: (a) Stigma, ovule, embryo sac, placenta Question 21. Science of cultivation, breeding, marketing and arrangement of flowers is called (a) arboriculture (b) floriculture (c) horticulture (d) anthology Answer: (b) floriculture Question 22. Nonessential floral organs in a flower are (a) sepals and petals (b) anther and ovary (c) stigma and filament (d) petals only. Answer: (a) sepals and petals Question 23. The stamens represent (a) microsporangia (b) male gametophyte (c) male gametes (d) microsporophylls. Answer: (d) microsporophylls Question 24. Anther is generally (a) monosporangiate (b) bisporangiate (c) letrasporangiate (d) trisporangiate. Answer: (c) letrasporangiate Question 25. 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. Answer: (b) middle layers lie between endothecium and tapetum Question 26. The innermost layer of anther is tapetum whose function is (a) dehiscence (b) mechanical (c) nutrition (d) protection. Answer: (c) nutrition Question 27. Callase enzyme which dissolves callose of pollen tetrads to separate four pollens is provided by (a) pollens (b) tapetum (c) middle layers (d) endothecium. Answer: (b) tapetum Question 28. 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) young anthers Question 29. Study of pollen grains is called (a) micrology (b) anthology (c) palynology (d) pomology Answer: (c) palynology Question 30. Several pollen grains form a unit designated as pollinium in Family (a) Asteraceae (c) Asclepiadaceae Pollen (b) Cucurbitaceae (d) Brassicaceae Answer: (c) Asclepiadaceae Pollen Question 31. Triple fusion in Capsella bursa pastoris is fusion of male gamete with (a) egg (b) synergid (c) secondary nucleus (d) antipodal. Answer: (c) secondary nucleus Question 32. Double fertilisation was first discovered in 1898 by _______ in Fritillaria and Lilium. (a) Nawaschin (b) Strasburger (c) Amici (d) Focke Answer: (a) Nawaschin Question 33. 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 Answer: (c) 16 Question 34. 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 Answer: (a) 8 Question 35. The true embryo develops as a result to fusion of (a) two polar nuclei of embryo sac (b) egg cell and male gamete (c) synergid and male gamete (d) male gamete and antipodals. Answer: (b) egg cell and male gamete Question 36. Father of Indian embryology is (a) P. Maheshwari (b) Swaminathan (c) R. Misra (d) Butler Answer: (a) P. Maheshwari Question 37. The portion of embryonal axis between plumule (future shoot) and cotyledons is called (a) hypocotyl (b) epicotyl (c) coleorhiza (d) coleoptile. Answer: (b) epicotyl Question 38. Coleoptile and coleorhiza are the protective sheaths _______ covering _______ and _______ respectively. (a) plumule, epicotyl (b) radicle, plumule (c) plumule, radicle (d) radicle, hypocotyl Answer: (c) plumule, radicle Question 39. _______ is not an endospermic seed. (a) Pea (b) Castor (c) Maize (d) Wheat Answer: (a) Pea Question 40. Endosperm is completely consumed by the developing embryo in (a) pea and groundnut (b) maize and castor (c) castor and groundnut (d) maize and pea. Answer: (a) pea and groundnut Question 41. Pollen grain is a (a) megaspore (b) microspore (b) microspore (d) microsporangium. Answer: (b) microspore Question 42. How many pollen mother cells should undergo meiotic division to produce 64 pollen grains ? (a) 64 (b) 32 (c) 16 (d) 8 Answer: (c) 16 Question 43. How many meiotic divisions are required for the formation of 100 pollen grains ? (a) 100 (b) 50 (c) 25 (d) 26 Answer: (c) 25 Question 44. One of the most resistant biological material present in the exine of pollen grain is (a) pectocellulose (b) sporopollenin (c) suberin (d) cellulose. Answer: (b) sporopollenin Question 45. What is the function of germ pore ? (a) Emergence of radicle (b) Absorption of water for seed germination (c) Initiation of pollen tube (d) All of these. Answer: (c) Initiation of pollen tube Question 46. _______of the pollen grain divides to form two male gametes. (a) Vegetative cell (b) Generative cell (c) Microspore mother cell (d) None of these Answer: (b) Generative cell Question 47. The three cells found in a pollen grain when it is shed at 3-celled stage are (a) 1 vegetative cell, 1 generative cell, 1 male gamete (b) 1 vegetative cell, 2 male gametes (c) 1 generative cell, 2 male gametes (d) either (a) or (b). Answer: (b) 1 vegetative cell, 2 male gametes Question 48. Megasporangium along with its protective integuments is called (a) ovary (b) ovule (c) funicle (d) chalaza Answer: (b) ovule Question 49. Mature ovules are classified on the basis of funiculus. If micropyle comes to lie close to the funiculus the ovule is termed as (a) orthotropous (b) anatropous (c) hemitropous (d) campylotropous Answer: (b) anatropous Question 50. 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) orthotropous Question 51. Fragrant flowers with well developed nectaries are an adaptation for (a) hydrophily (b) anemophily (c) entomophily (d) none of these Answer: (c) entomophily Question 52. Pollen kitt is generally found in (a) anemophilous flowers (b) entomophilous flowers (c) ornithophilous flowers (d) malacophilous flowers Answer: (b) entomophilous flowers Question 53. Which of these is a condition that makes flowers invariably autogamous ? (a) Dioecy (b) Self incompatibility (c) Cleistogamy (d) Xenogamy Answer: (c) Cleistogamy Question 54. Heterostyly as a contrivance for cross-pollination is found in (a) Pennisetum (b) Impatiens (c) Primula vulgaris (d) Oenothera Answer: (c) Primula vulgaris Question 55. The part of gynoecium that determines the compatible nature of pollen is (a) stigma (b) style (c) ovary (d) synergids Answer: (a) stigma Question 56. Part of the gynoecium which receives the pollen is called (a) style (b) stigma (c) ovule (d) ovary Answer: (b) stigma Question 57. Growth of pollen tube towards embryo sac is (a) chemotropic (b) thigmotaxis (c) geotropic (d) none of these Answer: (a) chemotropic Question 58. During the process of fertilisation the pollen tube of the pollen grain usually enters the embryo sac through (a) integument (b) nucellus (c) chalaza (d) micropyle Answer: (d) micropyle Question 59. Fusion of one of the male gametes with egg nucleus is referred to as (a) generative fertilisation (b) syngamy (c) vegetative fertilisation (d) both (a) and (b) Answer: (d) both (a) and (b) Question 60. The total number of nuclei involved in double fertilisation in angiospersm are (a) two (b) three (c) four (d) five Answer: (d) five