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Sexual Reproduction in Flowering Plants Test - 46

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Sexual Reproduction in Flowering Plants Test - 46
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  • Question 1
    1 / -0
    Beaked, syngenesious anthers and epipetalous stamens are found in
    Solution
    In Asteraceae or Compositae, stamens are 5, epipetalous and alternate. The stamens are syngenesious that is only anthers are fused into a tube around the style and filaments are free. Anthers are dithecous, basifixed and dehiscing longitudinally. 
  • Question 2
    1 / -0
    Which of the following statements are true for flowers?
    Solution
    Flowers are sexual reproductive organ of plant because they contain male and female reproductive organ- stamen and pistil which form male and female gametes (pollen,ovule).Flowers can be unisexual (having only stamen or pistil) or bisexual (contain both stamen and pistil). After fertilization male and female gametes fuse to form zygote and ovary develops into fruit. Some plants do not produce flower like-moss, fern etc. These plant reproduce by spores.
  • Question 3
    1 / -0
    Mustard oil is obtained from
    Solution

    Mustard oil is extracted from the seeds of the mustard plant (Brassica campestris), belonging to the cruciferous family of plants. It is originally from the Mediterranean regions, but it grows easily in many parts of the world. It has a characteristically pungent flavor and aroma. Though this oil is nutty tasting, it is good for heart and also has many other benefits. Mustard oil contains a high amount of selenium and magnesium, which gives it anti-inflammatory properties. Whereas Brassica oleracea is the wild cabbage and Capsell bursa pastoris is the shepherd's purse. Thus, the correct answer is option A.

  • Question 4
    1 / -0
    In Figure, the parts A, B and C are sequentially ....

    Solution
    Plumule is shoot ,radicle is root and cotyledon are seed leaf.In germination process cotyledons absorb water and swell then radicle develops and after that plumule develops.
  • Question 5
    1 / -0
    Number of stamens present in Malvaceae is
    Solution
    In Malvaceae family, the stamens are five to numerous, and connate at least at their bases, but often forming a tube around the pistils. 
  • Question 6
    1 / -0
    Staminal tube is found in 
    Solution
    Stamens are numerous, epipetalous and monadephous. The filaments of all the stamens fuse to form staminal tube, round the style is a characteristic feature of family Malvaceae.
  • Question 7
    1 / -0
    The asexual process replaced by the sexual method is known as
    Solution
    In botany, apomixis was defined by Hans Winkler as replacement of the normal sexual reproduction by asexual reproduction, without fertilization. Apomixis is a reproductive mechanism that bypasses the sexual process and allows a plant to clone itself through seed.

    So, the correct answer is 'Apomixis'.
  • Question 8
    1 / -0
    The endosperm of angiosperms is developed from
    Solution
    In the case of double fertilization, which occurs in angiosperms, the primary nucleus fused with one of the nuclei of male gamete and produces zygote and secondary nucleus fuses with another nucleus of the male gametes and forms endosperm. Endosperm provides nourishment for the developing embryo. The other male gamete which enters the embryo sac fuses with the haploid egg and forms the embryo. Thus, the correct answer is option D.
  • Question 9
    1 / -0
    Perispermic seed is
    Solution
    Perisperm, the nutritive tissue of the seed which originates from the tecrine or nucellus, outside the embryo sac. It consits mainly of thin-walled parenchymatous cells rich in starch or oil, and, together with the endosperm within the embryo-sac, constitutes what was formerly known as albumen. With the exception of some Alismaceas and Orchidaceas, almost all spermaphytes have perisperm in the early stages of the development of the seed; but in 'exalbuminous' seeds it, together with the endosperm, is absorbed before the seed is ripe.
  • Question 10
    1 / -0
    Outermost layer of the pollen is formed from ..........
    Solution
    Sporopollenin is major component of the tough outer walls called as exine of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments. The exine layer is often intricately sculptured in species-specific patterns, allowing material recovered from lake sediments to provide useful information to palynologists about plant and fungal populations in the past. The chemical composition of sporopollenin is not exactly known, due to its unusual chemical stability and resistance to degradation by enzymes and strong chemical reagents.
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