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Sexual Reproduction in Flowering Plants Test - 69

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Sexual Reproduction in Flowering Plants Test - 69
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  • Question 1
    1 / -0
    Self pollination, which involves two different flowers of the same plant, is called?
    Solution
    Geitonogamy is a mode of pollination. In this type, there is the fertilization of a flower by the pollen grains of the same or genetically identical flower. It is a type of self-pollination. It comes from a Latin word, geiton means neighbor, and gamy means marriage.
    Thus, the correct answer is option B. 
  • Question 2
    1 / -0
    The endosperm in angiosperms develops from
    Solution
    Endosperm is formed when the two sperm nuclei inside a pollen grain reach the interior of an embryo sac or female gametophyte. One sperm nucleus fertilizes the egg, forming a zygote, while the other sperm nucleus usually fuses with the two polar nuclei or the secondary nuclei at the center of the embryo sac, forming a primary endosperm cell (often called as the triple fusion nucleus). The cell created in the process of double fertilization develops into the endosperm. 
    It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. 
  • Question 3
    1 / -0
    Exine of pollen grain is made up of
    Solution
    Pollen grain is a uninucleate cell with two layered cell wall. Exine is the outer covering of pollen grain which is highly sculptured with sporopollenin; a chemically inert polymer of carotenoid ester which is highly resistant to degradation by any enzyme, as known so far. Option C is correct. 
    The inner thin cell layer of cellulose/pectin cellulose makes intine; this makes option A incorrect. 
    Lignin may or may not be present in the outer wall which makes option B incorrect. Correct answer is B. 
    The sticky oily covering found around surface of pollens is termed as pollen kit. It is not part of pollen wall. This make option D incorrect.
    Therefore, the correct answer is option C.
  • Question 4
    1 / -0
    Cross pollination does not occur in
    Solution
    Cleistogamous flowers characteristics:  
    • They do not open at all. 
    • The anthers and stigma lie close to each other.
    • When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. It is autogamous.
    • They produce assured seed-set even in the absence of pollinators.
    Thus, they do not show cross pollination.
    So, the correct answer is 'Cleistogamous flowers'
  • Question 5
    1 / -0
    Environmental biotic factor that helps in pollination is
    Solution
    A pollinator is the biotic agent (vector) that moves pollen from the male anthers of a flower to the female stigma of a flower to accomplish fertilization of the female gametes in the ovule of the flower by the male gametes from the pollen grain. Here, insect is the biotic factor. 
    So, the correct answer is 'Insects'
  • Question 6
    1 / -0
    Milky water in green coconut is 
    Solution
    Correct option: B
    Explanation:

    • The milky water present in the green coconut is actually the endosperm present in the liquid form.
    • The liquid endosperm is responsible to provide nutrition to the developing embryo.
    • Thus, after the embryo development when the coconut matures, the liquid is taken up by the embryo for its nutrition.
    Hence, the correct answer is Liquid endosperm.
  • Question 7
    1 / -0
    In angiosperms, the formation of two male gametes from a pollen grain involves _________ divisions.
  • Question 8
    1 / -0
    What is not true about emasculation of a flower while performing an artificial cross?
    Solution
    Emasculation is the removal of anthers in a bisexual flower to prevent self-pollination. It is done before the flowering period(anthesis). The female reproductive part is not involved in this process. It is a technique used by plant breeders to obtain the desired variety by crossing a plant with the desired pollen grain obtained by emasculation. 
    So, the correct answer is 'It is done in flowers of plants selected as male parent'.
  • Question 9
    1 / -0
    The coconut water from tender coconut represents
    Solution
    Coconut water is the endosperm part of the coconut plant. Endosperm is the most common nutritive tissue for the development of embryos in Angiosperms and develops as post-fertilization structure from the primary endosperm nucleus. The coconut endosperm is a nuclear type. In very young coconut fruit the endosperm is found as a clear fluid in which float numerous nuclei of various sizes. This fluid is compactly filling the embryo sac in which the embryo is developing.
  • Question 10
    1 / -0
    Cotyledon of maize grain is called as:
    Solution
    The embryo in maize grain consists of a single cotyledon called a scutellum, a radicle, and a plumule. The radicle lies towards the pointed side of the embryonic region of the seed. It is covered by a protective sheath called coleorhiza. The plumule is located towards the upper side of the embryonic region opposite to radicle. It is also enclosed in a protective sheath known as coleoptile. 
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