NEET Biology Sexual Reproduction in Flowering Plant / फूलों के पौधों में यौन प्रजनन Question Bank

done Critical Thinking Questions Total Questions - 23

• question_answer1)
  After demonstration of totipotency, a botanist wishes to produce identical plants from an angiosperm by tissue culture. The parts or tissues which are likely to yield haploid embryos are
  A)
  Root tips done clear
  B)
  Stem apices done clear
  C)
  Leaves done clear
  D)
  Anthers done clear
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• question_answer2)
  The most significant value of vegetative propagation is that
  A)
  It is a means of producing a large population of individuals genetically identical to the parent done clear
  B)
  It ensures that the progeny are safe from attack of diseases and pests done clear
  C)
  It is an ancient practice done clear
  D)
  It enables rapid production of genetic variation done clear
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• question_answer3)
  The microspore tetrad of angiosperm at the time of formation, are surrounded by a callose wall. Breakdown of this wall is brought about by the enzyme callase synthesized by the
  A)
  Tetrad cytoplasm done clear
  B)
  Ribosome of the tetrad done clear
  C)
  Spore mother cells done clear
  D)
  Cells of tapetum done clear
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• question_answer4)
  In angiosperms, the following events occur during megasporogenesis and megagametogenesis (i) Differentiation of megaspore mother cells (ii) Meiosis of the megaspore mother cell (iii) Formation of a linear tetrad (iv) Mitotic division of the functional megaspore (v) Degeneration of 3 megaspores (vi) Formation of embryo sac (vii) Fusion of polar nuclei The correct sequence is
  A)
  v, i, ii, vi, vii, iii, iv done clear
  B)
  iv, iii, vii, vi, ii, i, v done clear
  C)
  v, i, ii, vii, vi, iv, iii done clear
  D)
  v, i, ii, vi, vii, iv, iii done clear
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• question_answer5)
  Cotton plug like tissue present at the mouth of the micropyle responsible for directing the pollen tube is called
  A)
  Carpophore done clear
  B)
  Trabaculae done clear
  C)
  Obturator done clear
  D)
  Translator done clear
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• question_answer6)
  The diagram below is a longitudinal section of an ovule of an angiosperm With which of the following structures do the contents of one pollen tube fuse with
  A)
  1 and 3 done clear
  B)
  1 and 4 done clear
  C)
  2 and 3 done clear
  D)
  3 and 4 done clear
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• question_answer7)
  At what stage of endosperm development, you will observe nuclear or cellular type of endosperm
  A)
  When divisions starts in embryo done clear
  B)
  When embryo is heart-shaped done clear
  C)
  Mature stage of endosperm done clear
  D)
  Just after division of primary endosperm nucleus done clear
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• question_answer8)
  Micropyle allows [CPMT 1978]
  A)
  Pollen tube to penetrate in the ovule at the time of fertilization done clear
  B)
  Activity of germination of pollen grains done clear
  C)
  A pore in pollen grain done clear
  D)
  The growing up of pollen grain done clear
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• question_answer9)
  Which of the following statement is correct for the pollen tube [NCERT 1980; CBSE PMT 1993]
  A)
  It shows chemotactic movement done clear
  B)
  It shows only tip growth done clear
  C)
  It is composed of three non-cellular zones done clear
  D)
  It shows radial cytoplasmic streaming done clear
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• question_answer10)
  Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because [NCERT 1983; CBSE PMT 1989; JIPMER 1993]
  A)
  Laser beam stimulates pollen germination and pollen tube growth done clear
  B)
  The laser beam does not damage the region from which pollen tube emerges done clear
  C)
  The contents of killed generative cell permit germination and pollen tube growth done clear
  D)
  The vegetative cell has not been damaged done clear
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• question_answer11)
  After penetrating stigmatic and styler tissues, the pollen tube usually grow down towards the egg because  [CPMT 1985]
  A)
  The egg cell attracts the pollen tube as they have dissimilar electric charge done clear
  B)
  The filiform apparatus of synergids is believed to attract the pollen tube done clear
  C)
  It has no other passage to follow done clear
  D)
  It grows under control of nucleus done clear
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• question_answer12)
  Double fertilization process means  [CBSE PMT 1991; CPMT 1972, 73, 81, 84, 87, 94, 95; NCERT 1969, 71; MP PMT 1997; DPMT 1983; BHU 1976, 82, 91, 99]
  A)
  Fusion of one male gamete nucleus with egg nucleus while fusion of other male gamete nucleus with secondary nucleus done clear
  B)
  Fusion of male gamete nucleus with secondary nucleus done clear
  C)
  Fusion of two polar nuclei with each other done clear
  D)
  Fusion of male gamete nucleus with egg nucleus done clear
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• question_answer13)
  The endosperm found in angiospermic seed is different from that of gymnosperms in the sense that, in the former [Bihar 1991]
  A)
  It is formed before fertilization while in the latter it is formed after fertilization done clear
  B)
  It is formed after fertilization while in the latter it is formed before fertilization done clear
  C)
  It is cellular while in the latter it is nuclear done clear
  D)
  It is nutritive while in the latter it is protective done clear
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• question_answer14)
  Sperm cells of angiosperms differ from the rest of the plant groups like gymnosperms by [AFMC 1993]
  A)
  In angiosperms the sperm cells are non-motile whereas in the others they are flagellate done clear
  B)
  In angiosperms the sperm cells are produced in the pollen grain whereas in the rest they are produced in the antheridium done clear
  C)
  In angiosperms and gymnosperms the sperm cells are non-motile whereas in the rest they are flagellated done clear
  D)
  None of the above done clear
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• question_answer15)
  When the pollen grains are not transferred from anthers to the stigma in flower due to the barrier or fence, it is referred as or when some natural barrier exists between androecium and gynoecium to check self pollination, it is known as [AIIMS 1993]
  A)
  Heterostyly done clear
  B)
  Herkogamy done clear
  C)
  Dichogamy done clear
  D)
  Cleistogamy done clear
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• question_answer16)
  Which is the most logical sequence with reference to the life cycle of angiosperms [DPMT 1993]
  A)
  Germination, endosperm formation, seed dispersal, double fertilization done clear
  B)
  Pollination, fertilization, seed formation, germination done clear
  C)
  Cleavage, fertilization, grafting, fruit formation done clear
  D)
  Maturation, mitosis, differentiation, fertilization done clear
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• question_answer17)
  By tissue culture, indefinite number of plants from a small amount of parental tissue can be obtained. This technique is of great economic importance as [AIIMS 1994]
  A)
  New species can be generated done clear
  B)
  Through somaclonal variation, a large number of variants can be isolated done clear
  C)
  It is a useful method to multiply genetically uniform population of elite species done clear
  D)
  Homozygous diploids can be obtained done clear
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• question_answer18)
  Despite high level of heterozygosity, the progeny derived from seed of a cross pollinated plant was found to be completely uniform. One reason for this may the phenomenon of [BHU 1994]
  A)
  Parthenocarpy done clear
  B)
  Apomixis done clear
  C)
  Induced mutation done clear
  D)
  Polyploidy done clear
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• question_answer19)
  Which of the following four phases, in the post emergence life of an angiospermic plant, begins just after germination of seed and ends when the plant develops the capacity to reproduce       [KCET 1999]
  A)
  Death done clear
  B)
  Ageing done clear
  C)
  Maturity done clear
  D)
  Juvenility done clear
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• question_answer20)
  For pollinated ovary which is correct [BHU 1999]
  A)
  Accessory cells are diploid done clear
  B)
  Antipodal cells are haploid done clear
  C)
  Egg cell is diploid done clear
  D)
  Ovule cell is haploid done clear
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• question_answer21)
  If the diploid number of an angiospermic plant is 24, the number of chromosomes in the pollen grain, endosperm and integument will be [CPMT 2000]
  A)
  12, 36, 12 done clear
  B)
  12, 24, 36 done clear
  C)
  12, 12, 36 done clear
  D)
  12, 36, 24 done clear
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• question_answer22)
  Secondary nucleus in the middle of an embryo sac of angiosperms is [BHU 1999; AIEEE 2003]
  A)
  Diploid done clear
  B)
  Triploid done clear
  C)
  Tetraploid done clear
  D)
  Haploid done clear
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• question_answer23)
  In angiosperms the pollen grain is normally pollinated at [AMU 2005]
  A)
  One cell stage done clear
  B)
  Two celled stage done clear
  C)
  Three celled stage done clear
  D)
  Four celled stage done clear
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