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Sexual Reproduction in Flowering Plants Test - 47

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Sexual Reproduction in Flowering Plants Test - 47
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  • Question 1
    1 / -0
    The botanical name of the National flower of India is
    Solution
    • The botanical name of the Indian National flower is Nelumbo nucifera.
    • Nelumbo nucifera, also known as Indian lotus, sacred lotus, bean of India, or simply lotus is one of two species of this aquatic plant in the family Nelumbonaceae. 
    • The roots of the lotus are planted in the soil of the pond or river bottom, while the leaves float on top of the water surface or are held well above it. 
    • Flowers are generally attached to the thick stem.

    Hence, the correct option is B.

  • Question 2
    1 / -0
    When embryo develops from nucellus, it is known as 
    Solution
    Apomixis refers to substitution of the usual sexual reproduction by a form of asexual reproduction which does not involve meiosis and syngamy. There are two main categories of apomixis- Vegetative reproduction (plants propagate through body parts other than seed) and Agamospermy (seed is retained as agent of propagation but the embryo is formed by some process in which normal meiosis and syngamy have been eliminated).
    Two different types of agamospermy have been recognized based on whether the embryo develops from a cell of the unreduced female gametophyte (gametophytic agamospermy) or directly from diploid sporophytic cells of the ovule such as nucellus or integuments (sporophytic or adventive embryony). In adventive embryony spore is not differentiated.
    When embryo develops directly from a diploid egg the process is also called as recurrent agamospermy.  In Non-recurrent Agamospermy, embryo develops parthenogenetically from haploid egg.
  • Question 3
    1 / -0
    Pick up the correct statement for pollen tube.
    Solution
    Chemotactic movement leads the pollen grains to the embryo sac. It means that the movement of gametes as a result of chemical induction. Chemotactic movement causes the pollen grains to reach the embryo sac and results in fusion, which is also called as syngamy. The pollen grain grows from its tip.
  • Question 4
    1 / -0
    In an angiosperm, the resultant of secondary nucleus with male gamete has $$.........$$ nature.
    Solution
    In angiosperms, double fertilization takes place, where two male gametes enter the embryo sac. One of the gametes fuse with the egg cell which forms the embryo. Whereas the other one fuses with secondary nuclei, which is diploid in nature. This results in the formation of triploid endosperm which provides nourishment to the growing embryo.
  • Question 5
    1 / -0
    Pollenkit helps in the
    Solution
    On the surface of the pollen there is a sticky layer known as the pollen coat or pollen kit, which is a rich source of proteins, lipids, vitamins, phenolic compounds and minerals for the bees. The extent  and chemistry of pollenkit varies from species to species and the bees prefer pollen rich in pollen kit.
  • Question 6
    1 / -0
    Which of the following is a non-recurrent apomixis? 
    Solution
    • Amphimixis is actually the process of sexual reproduction, which involves meiosis and syngamy. By meiosis, diploid cells of sporophyte give rise to haploid gametophytes, which produce male and female gametes. 
    • Syngamy, i.e. fusion of haploid gametes, results in the restoration of the diploid sporophytic generation.
    • Haploid parthenogenesis is the formation of an embryo from an unfertilized egg, thus forming a haploid embryo.
    • Aneuspory is a kind of diplospory in which a megaspore mother cell produces embryo sac by mitosis instead of meiosis, thus producing a diploid embryo sac.
    • Since non-recurrent apomixis is the direct development of the embryo from an unfertilized egg, therefore, Haploid parthenogenesis is non-recurrent apomixis.
    So, the correct answer is 'Haploid parthenogenesis'.
  • Question 7
    1 / -0
    The male gametes of angiosperms are
    Solution
    The male gametes of angiosperms consist of two sperm cells within a pollen grain or a pollen tube. They are derived from a single generative cell, which is formed as the smaller cell by unequal cell division in the microspore after meiosis. The gametes formed will be non-motile as there is no flagellated stage in the life cycle of angiosperms.
  • Question 8
    1 / -0
    Leeuwenhoek discovered ............
    Solution
    Citrus produces more than one embryo from one fertilized ovum and hence, called polyembryonic fruit. Citrus seed storage proteins were used as markers to compare the embryogenesis in developing seeds and somatic embryogenesis in vitro. It was first discovered by Leeuwenhoek.

  • Question 9
    1 / -0
    What is meant by emasculation?
    Solution
    • Emasculation is the process in which removal of stamens/anther from the male parts of the bisexual flower. It prevents self-pollination. It is performed when artificial pollination needs to be administered.  

    Thus, the correct option is C.
  • Question 10
    1 / -0
    In .......... flowers, the stigma is always branched rough and sticky.
    Solution
    • The stigma of anemophilous flowers is always rough and sticky to increase the ability to capture pollen.
    • Anemophily is the pollination whereby pollen is distributed by wind. 
    • Features of wind pollination syndrome include a lack of scent production, a lack of showy floral parts, reduced proportion of nectar, production of enormous numbers of pollen grains. 
    • This distinguishes them from entomophilous and zoophilous species.

    So, the correct answer is option B.
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