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Sexual Reproduction In Flowering Plants Mcq
Quiz 4
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Q.1
In orthotropous ovule, the micropyle and chalaza are ... .. [ AFMC 1998 ]
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a) Parallel to funiculus
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b) At right angles to funiculus
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c) Oblique angle to funiculus
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d) In straight line with funiculus
Explanation
Answer : (d)
Q.2
Adventitive polyembryony/from nucellar cells occurs in ... ... [ RPMT 2011 ]
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a) Poa
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b) Brassica
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c) Allium
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d) Citrus
Explanation
Answer : (d)
Q.3
Raphe is ... ... [ CPMT 2007 ]
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a) Ridge formed by fused funiculus
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b) Funicle attached to ovule
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c) Part of nucellus
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d) Part of flower
Explanation
Answer : (a)
Q.4
The tenuinucellate ovule has ... ..
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a) Large amount of nucellus
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b) Small amount of nucellus
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c) Micropylar nucellus
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d) Chalazal nucellus
Explanation
Answer : (b)
Q.5
Pollination by birds is ... .. [ HPPMT 2005 ]
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a) Malacophily
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b) Ornithophily
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c) Chiropterophily
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d) Myrmecophily
Explanation
Answer : (b)
Q.6
A natural sequence of developmental stages in the life cyle of an angiosperm is ... ..[ AIIMS 1991 ]
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a) Cleavage → Fertilization → Differentiation → Fruit formation
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b) Pollination → Fertilization → Seed formation → Germination
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c) Germination → Double fertilization → Endosperms formation → Seed dispersal
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d) Maturation → Mitosis → Differentiation → Fertilization
Explanation
Answer : (b)
Q.7
Tapetal cells of stamens are ... ... [ AMU 2003 ]
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a) Diploid uninucleate
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b) Tetraploid binucleate
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c) Hexaploid tetranucleate
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d) Polyploid multinucleate
Explanation
Answer : (d)
Q.8
Despite high level of heterozygosity, the progeny derived from a seed of cross pollinated plant was found to be completely uniform. One reason can be ... .... [ BHU 1994 ]
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a) Induced mutation
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b) Polyploidy
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c) Apomixis
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d) Parthenocarpy
Explanation
Answer : (c)
Q.9
Cleistogamous flower is found in ... ... [ JKCMEE 2011]
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a) Tobacco
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b) Mirabilis
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c) Viola
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d) None of the above
Explanation
Answer : (c)
Q.10
Pollen tube deposits its inclusions in ... ... [ RPMT 1998]
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a) Central cell
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b) Synergids
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c) Oosphere
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d) Antipodal cells
Explanation
The synergid cells are located in the female gametophyte and are essential for angiosperm reproduction. During the fertilization process, a pollen tube grows into one of the synergid cells, ceases growth, ruptures, and releases its two sperm cells into this cell The two male gametes then move towards the egg cell and central cell for syngamy and triple fusion. The other synergid which is the persistent synergid degenerates soon after pollen tube has released its contents in the embryo sac. Answer : (b)
Q.11
In fertilized ovule, n, 2n and 3n conditions occur respectively in ... ... [ BHU 1990]
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a) Antipodal, egg and endosperm
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b) Egg, nucellus and endosperm
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c) Endosperm, nucellus and egg
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d) Antipodals, synergids and integuments
Explanation
Answer : (b)
Q.12
Which occurs after double fertilization ... ... [ kerala 2012 ]
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a) pollen grain germinates over stigma
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b) pollen tube enters the embryo sac
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c) Two male gametes are discharged into embryo sac
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d) PEN develops into endosperm
Explanation
Answer : (d)
Q.13
In Cucumber, pollen tube enters embryo sac through ... ... [ Manipur 2005 ]
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a) Integuments
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b) Micropyle
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c) Endosperm
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d) Chalaza
Explanation
Answer : (a)
Q.14
During formation of pollen grains, a microspore mother cell undergoes ... ... [ CBSE 2001 ]
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a) One meiotic division
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b) One mitotic division
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c) One meiotic and one mitotic division
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d) One meiotic and two mitotic divisions
Explanation
Answer : (a)
Q.15
Effect of pollen on character of pericarp and seed coat is ... .. [ AMU 2002 ]
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a) Xenia
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b) Metaxenia
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c) Ruminante endosperm
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d) Chimera
Explanation
Answer : (b)
Q.16
Development of sporophyte/embryo from gametophytic tissue without fusion of gametes is .. ... [ Pb PMT2000]
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a) Apospory
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b) Apogamy
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c) Apomixix
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d) parthenogenesis
Explanation
Answer : (b)
Q.17
Intraspecific cross pollination is ... ... [ HPPMT 2010 ]
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a) Allogamy
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b) Geitonogamy
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c) Xenogamy
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d) Alloautogamy
Explanation
Answer : (c)
Q.18
Movement of pollen tube towards embryo sac is ... ... [ BHU 2002 ]
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a) Thermotactic
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b) Phototactic
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c) Chemotatic
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d) Thigmotactic
Explanation
Answer : (c)
Q.19
In angiosperms functional megaspore develops into ... .. [ CBSE mains 2011]
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a) Endosperms
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b) Embryo sac
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c) Ovule
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d) Pollen sac
Explanation
Answer : (b)
Q.20
Embryo sac is ... ... [ Bih PMT 2002 ]
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a) Microgametophyte
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b) Microsporangium
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c) Megagametophyte
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d) Megasporangium
Explanation
Answer : (c)
Q.21
Ovules of Capsella and Pisum sativum are ... .. [ RPMT 1995 ]
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a) Orthotropous
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b) Anatropous
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c) Amphitropous
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d) Campylotropous
Explanation
Answer : (d)
Q.22
Which pair has haploid nature ... ... [ CBSE 2008 ]
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a) Nucellus and antipodal cells
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b) Egg nucleus and secondary nucleus
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c) Megaspore mother cell and antipodal cells
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d) Egg cell and antipodal cells
Explanation
Answer : (d)
Q.23
tion 2 What is the fate of the male gametes discharged in the synergid? [NEET 2019]
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a) One fuses with egg other(s) degenerate(s) in the synergid.
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b) All fuse with the egg.
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c) One fuses with the egg, other(s) fuse(s) with synergid nucleus.
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d) One fuses with the egg and other fuses with central cell nuclei.
Explanation
The pollen tube contains two sperms (each is a haploid male gamete). When pollen tube enters the embryo-sac (inside the ovule), it bursts to release its contents i.e., two sperms along with certain amount of protoplasm . The first male gamete discharge in one of the synergid.one fuses with the egg and other fuses with the secondary or definitive nucleus present in central cell. Answer:(d)
Q.24
Parthenocarpic fruits are produced by ... ... [ CBSE 2006 ]
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a) Treating plants with phenyl mercuric acetate
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b) treating plants with low concentration of gibberellic acid and auxin
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c) Removing androecium of flowers before release of pollen grains
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d) Raising plants from vernalised seeds
Explanation
Parthenocarpy is the development of fruits without prior fertilization which results in the formation of seedless fruits. In some plant species, parthenocarpic (seedless) fruits may be produced naturally or they may be induced by treatment of the unpollinated flowers with auxin e.g. Parthenocarpic tomato fruits can be produced by treating the plants with low concentration of gibberellic acid (promotes fruit set) and auxin (completes the development process).Removal of androecium, before pollen release, is called emasculation which is helpful in preventing unwanted poor pollination.Vernalized seeds are the chill treated seeds for breaking dormancy.Phenyl mercuric acetate is an antitranspirant. Answer : (b)
Q.25
Match the columns
a) Zoophily
1) Pollination by birds
b) Ornithophily
2) Pollination by insects
c) Entomophily
3) Pollination by bats
d) Chiropterophily
4) Pollination by animal
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a) a - 3, b - 2, c - 1, d - 4
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b) a - 1, b - 2, c - 3, d - 4
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c) a - 4, b - 1, c - 2, d - 3
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d) a - 4, b - 2, c - 3, d - 1
Explanation
Answer : (c)
Q.26
Number of chromosomes is 24 in nucelus. Number of chromosomes in microspore mother cell would be .. .. [ AMU 2001 ]
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a) 36
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b) 30
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c) 24
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d) 12
Explanation
Answer : (c)
Q.27
Genotypically the pollen grains produced an anther belong to ... ... [ CPMT 1991]
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a) One type
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b) Two types
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c) Many types
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d) All the above
Explanation
Answer : (c)
Q.28
Function of guiding and attracting pollen tube is done by ... ... [ AFMC 2002 ]
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a) Egg cell
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b) Filiform apparatus
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c) Antipodal cells
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d) Secondary nucleus
Explanation
Answer : (b)
Q.29
In double fertilization, male gamete and secondary nucleus form ... ... [ AFMC 1999 ]
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a) Endosperm
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b) Gamete
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c) Embryo
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d) Egg
Explanation
Answer : (a)
Q.30
Gametogenesis is haploid plants involves ... ... [ AMU 2011 ]
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a) Binary fission
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b) Meiosis
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c) Mitosis
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d) Amitosis
Explanation
Answer : (c)
Q.31
Assertion: In some species of asteraceae and poaceae, seeds are formed without fertilization Reason: Formation of fruit without fertilization is called parthenocarpy ... ... [ AIIMS 2011]
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (b)
Q.32
What is wrong ... ... [ DPMT 2011]
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a) Pollen grains remain viable for several months because of sporopollenin covering
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b) No enzyme can degrade sporopollenin
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c) Pollen grains are well represented in fossil strata due to sporopollenin
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d) Pollen wall has cavities containing proteins
Explanation
Sporopollenin is a substance which is very tough and resistant. This provides protection to the pollen grains from adverse conditions like high temperature, pH, etc. This helps to preserve the pollen grain and prevents from getting denatured for a long period of time. statement correct (a) Proteases can be used for disrupting the structure of sporopollenin thereby disrupting exine of pollen grain. Though it is difficult to destroy exine, but proteases can be used as sporopollenin is made up of phenylalanine derivatives which are amino acids. Sporopollenin is one of the most chemically inert biological polymers. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments. statement (c) is not correct Proteins are stored in two sites in the pollen grain walls of the Malvaceae, (a) in the cellulosic intine, mainly in the vicinity of the circular apertures, and (b) in cavities in the sculptured layer of the exine. The intine-held materials are incorporated during the growth of the wall. Answer : (c)
Q.33
Suspensor of embryo is formed by ... ... [ MHTCET 2008 ]
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a) Basal cell
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b) Apical cell
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c) Terminal cell
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d) Hypophysis
Explanation
Answer : (a)
Q.34
In angiosperms, endosperm is formed by .... ....
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a) Division of fused polar nuclei
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b) Free nuclear division of megaspore
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c) Division of fused synergids and male gamete
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d) Division of fused polar nuclei and male
Explanation
Answer : (d)
Q.35
Female gamete of angiosperms is represented by ... .. [ AMU 1998]
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a) Oospore
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b) Carpel
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c) Egg
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d) Pollen grain
Explanation
Answer : (c)
Q.36
Maturation of anthers and stigma at the same time is ... ... [ JIPMER 2000 ]
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a) Allogamy
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b) Xenogamy
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c) Homogamy
0%
d) Dichogamy
Explanation
Answer : (c)
Q.37
Embryo sac occurs in ... ... [ CBSE 1991 ]
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a) Embryo
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b) Axis part of embryo
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c) Ovule
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d) Endosperm
Explanation
embryo sac. the megaspore of a seed-bearing plant, situated within the ovule, giving rise to the endosperm and forming the egg cell or nucleus from which the embryo plant develops after fertilization Answer : (a)
Q.38
Fibrous thickenings of hygroscopic nature are found in this part of anther ... .. [ EAMCET 2005 ]
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a) Epidermis
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b) Tapetum
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c) Middle layer
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d) Endothecium
Explanation
Answer : (d)
Q.39
Chromosome number in oosphere isThe number in angiospermic endosperm shall be ... ... [ CPMT 1994 ]
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a) 8
0%
b) 12
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c) 16
0%
d) 24
Explanation
Answer : (d)
Q.40
Which is not true ... ...
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a) Pollen grain are released from anthers at 2-celled stage
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b) Sporogenous cell directly behave as megaspore mother cell
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c) Megaspore divides twice to form an 8-nucleate embryo sac
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d) Endosperm is triploid
Explanation
The ovule or the megasporangium develops as a small protuberance of the placental tissue. In the very young ovule a single hypodermal cell is differentiated as archesporium cell. The archesporial cell may directly function as megaspore mother cell (tenuinucellate ovule) or may divide periclinally to form an outer parietal cell and an inner sporogenous cell (crassinucellate ovule). The sporogenous cell directly behaves as megaspore mother cell (or megasporocyte). Answer : (c)
Q.41
In mesogamy, pollen tube enters the ovule through ... ... [ Manipla 1997 ]
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a) Middle of integuments after piercing the tissues
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b) Middle of integuments without piercing the tissues
0%
c) Chalaza
0%
d) Middle of micropyle
Explanation
Answer : (a)
Q.42
Ovule is inverted with body fused to funicle, micropyle laying close to hilum and facing the placenta. It is ... ... [ BHU 1998 ]
0%
a) Hemitropous
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b) Orthotropous
0%
c) Anatropous
0%
d) Campylotropous
Explanation
Answer : (c)
Q.43
Nucellae embryo is .. .. [ CBSE 1989]
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a) Amphimictic haploid
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b) Amphimictic diploid
0%
c) Apomictic haploid
0%
d) Apomictic diploid
Explanation
Answer : (d)
Q.44
For self pollination, a flower should be ... ... [ Har PMT 2005 ]
0%
a) Asexual
0%
b) Monosexual
0%
c) Unisexual
0%
d) Bisexual
Explanation
Answer : (d)
Q.45
Fore-runner of male gamete is ... ... [ MHTCET 2010 ]
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a) Megasporangium
0%
b) Antipodal cell
0%
c) Microspore mother cell
0%
d) Embryo sac
Explanation
Answer : (c)
Q.46
Pollenkitt is formed from ... ... [ CPMT 2001 ]
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a) Endothecium
0%
b) Middle layers
0%
c) Microspore mother cell
0%
d) Tapetum
Explanation
Answer : (d)
Q.47
Fusion of one male gamete with egg and other of the same pollen tube with two polar nuclei is ... ... [ AIIMS 2005 ]
0%
a) Triple fusion
0%
b) Vegetative fertilization
0%
c) Double fertilization
0%
d) parthenogenesis
Explanation
Answer : (c)
Q.48
Vegetative fertilization, which involves formation of endosperm, is fusion of ... ... [ JKCMEE 2003 ]
0%
a) One male gamete with diploid secondary nucleus
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b) Two vegetative cells
0%
c) Two male gametes
0%
d) Female gamete with secondary nucleus
Explanation
Answer : (a)
Q.49
Polar nuclei are located in ... .. [ CPMT 1994]
0%
a) Pollen tube
0%
b) Embryo sac
0%
c) Ovule
0%
d) Thalamus
Explanation
Answer : (b)
Q.50
Plants with one or a few ovules are generally pollinated by [ CBSE 2012 ]
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a) Wind
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b) Bees
0%
c) Birds
0%
d) Butterflies
Explanation
Answer : (a)
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