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Sexual Reproduction in Flowering Plants Test - 51

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Sexual Reproduction in Flowering Plants Test - 51
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  • Question 1
    1 / -0
    Apomixis is 
    Solution
    Correct option: D
    Explanation:
    • Apomixis is a type of asexual reproduction in plants.
    • Here, the zygote is not formed as a result of the fusion of gametes but by parthenogenesis.
    • Here, the megaspore mother cell forms the embryo sac and then develops into a seed without fertilisation.
    • Hence, apomixis is "failure of fusion of gametes resulting in parthenogenesis".

  • Question 2
    1 / -0
    Diptera flies are trapped for pollination by the flowers of 
    Solution
    Fly trap mechanism is a method of pollination in insect pollinated i.e. entomophilous flowers. Such plants secrete some chemicals to attract insects which aid in pollination. For example, Aristolochia. In Aristolochia, stigma receptivity is lost before the anther dehisces. So, it has developed a mechanism to get pollinated by the diptera flies. At the time of anther dehiscence, this plants secrete chemicals to attract the diptera flies. The flowers of Aristolochia consists of a long perianth tube containing many hairs that point downwards. Such hairs are called deflexed hairs and aid in the entry of the flies in the tube through which it reaches the base of the flower. The anthers dehisce and pollen are laden on the back of the insect. The deflexed hair shed or wither off and the fly can exit the flower. When it enters another flower, pollination occurs.
    So, the correct answer is 'Aristolochia'.
  • Question 3
    1 / -0
    The phenomenon of male and female structures maturing at two different 
    times is ...............
    Solution
    Dichogamy : It is defined as the condition in some flowering plants, in which the pistils and stamens mature at different times, thus preventing self-pollination. In other terms, it is defined as the maturation of male and female parts of a flower at different times, preventing automatic self-pollination.
  • Question 4
    1 / -0
    Match the Sets.
      List I List II 
     A Intine 1 Microspore mother cell
     B Pollen sac 2 Cellulose
     C Pin-eyed 3 Short-styled
     D Thrum-eyed 4 Long-styled
    Solution
    Intine - cellulose
    Pollen - microspore mother cell
    Pin-eyed - Long styled
    Thrum-eyed - Short styled
    The pollen grain has an inner and outer layer. The inner layer is called as intine and the outer one is called as exine. Intine is composed of cellulose.
    A diploid cell in plants that divides by  meiosis to give rise to four haploid microspores. In flowering plants microspore mother cells are formed within the pollen sacs of the anthers by mitosis; the microspores they produce develop into pollen grains.
    Pin-eyed : Having the stigma in the mouth of the corolla, on one end of a long style with the stamens lower in the tube
    Thrum-eyed: Having on a short style below the anthers, which like in the mouth of the corolla on big stamens.
  • Question 5
    1 / -0
    Match the two columns.
      List I  List II
     A Mature microspore 1 Exine of pollen grain
     B Sporopollenin 2 Pollen grain
     C Megasporangium 3 Funcile
     D Stalk of ovule 4 Ovule
    Solution
    Mature microspore is called as pollen grain. It is haploid in nature and is formed as a result of meiosis from megaspore mother cell which is diploid in nature. Sporopollenin is the substance present in the exine layer of pollen grain. It provides the tough structure for the outer cover of pollen grains. Megasporangium is also called as female gametophyte, known as female gametophyte. Fertilization takes place in megasporangium and forms zygote. The ovule is attached to the ovary wall until maturity by a  short stalk called funiculus. The area of attachment to the ovary wall is referred to as the placenta.
  • Question 6
    1 / -0
    When pollen is transferred from the anther of a flower to the stigma of another flower of the same plant, it is referred to as
    Solution
    • Geitonogamy is a type of self-pollination.
    •  Geitonogamy is when pollen is exported using a vector (pollinator or wind) out of one flower but only to another flower on the same plant. It is a form of self-fertilization.
    • A vector must be used to transport pollen from flower to flower on the same plant.
    •  Hence, When pollen is transferred from the anther of a flower to stigma of another flower of the same plant, it is referred to as Geitonogamy.
    • So, the correct answer is 'Geitonogamy'.
  • Question 7
    1 / -0
    Mark the layer endothecium that is rich in sporopollenin, the resistant protein.

    Solution
    Layer endothecium is marked by D. It is a layer present after middle layer. It helps to provide nutrition to developments of pollen grains and also help in dehiscence of spores. Thus, the correct option is A.
  • Question 8
    1 / -0
    Which one of them cannot exhibit both autogamy and geitonogamy?
    Solution
    Autogamy: Transfer of pollen grains from the anther to the stigma of the same flower.
    Geitonogamy: The transfer of pollen from the anther of one flower to the stigma of another flower in the same plant.
    Whereas, in Papaya both these are not possible. The female plants produce fruit and may be cross pollinated with others by pollinating agents like insects and wind. It is because in papaya both male and female flowers are present on different plants.
  • Question 9
    1 / -0
    In which one of the following pollination is autogamous?
    Solution
    Correct option: A
    Explanation:
    • Autogamous refers to self-pollination.
    • In cleistogamous flowers, the flowers remain close for the entire time.
    • Due to this, the pollen grain from the stamen lands on the stigma of the same flower.
    • In chasmogamous flowers, the flowers are open with anther and stigma exposed.
    • Here, both geitonogamy and xenogamy are observed.
    Hence, in "cleistogamy" pollination is autogamous.
  • Question 10
    1 / -0
    In which of the following is translator mechanism found?
    Solution
    Calotropis species are considered common weeds in some parts of the world. It shows translator or clip mechanism. Pollen grains are present in pollinia. The pollinia are attached to a rough and sticky disc called corpusculum. When the insect visits the flower pollinia get entangled in the legs of the insect. When this insect visits another flower, pollinia are transferred.
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