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Sexual Reproduction in Flowering Plants Test - 30

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Sexual Reproduction in Flowering Plants Test - 30
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  • Question 1
    1 / -0
    Persistent nucellus in the seed is known as:
    Solution
    Persistent nucellus in some seeds is called Perisperm. Perisperm is a layer of nutritive tissue in the seed of certain flowering plants. It is derived from the nucellus and surrounds the embryo.
    So, the correct answer is 'Perisperm'
  • Question 2
    1 / -0
    Pollen grains can be stored for several years in liquid nitrogen having a temperature of
    Solution

    Pollen grains can be stored for several years in liquid nitrogen at a temperature of -196℃ and this is known as cryopreservation. So, the correct answer is option A.

  • Question 3
    1 / -0
    Pollination in water hyacinth and water lily is brought about by the agency of
    Solution
    Water lily has actinomorphic flowers and produce large number of stamen to favor anemophily (wind pollination). Water hyacinth exhibit entomophily and is pollinated by insects that feed on its foliage
    So, the correct answer is 'Insects or wind'
  • Question 4
    1 / -0
    Seed formation without fertilization in flowering plants involves the process of
    Solution
    • Seed formation without fertilization in flowering plants involves the process of apomixis. 
    • Although seeds, in general, are the products of fertilization, a few flowering plants such as Asteraceae and grasses, have evolved this special mechanism.
    • An apomixis is a form of asexual reproduction that mimics sexual reproduction. It includes abnormal sexual reproduction in which egg or other cells like synergids and antipodals develop into an embryo without fertilization and meiosis.
    So, the correct answer is option D.
  • Question 5
    1 / -0
    Winged pollen grains are present in
    Solution

    Mangoes and mustard are pollinated by insects as they produces and nectar and have sticky and heavy pollen grains. Cycas and pinus are pollinated by wind but in cycas, pollen is dry, light and round. Whereas, in pinus, pollen is winged that helps in pollination. Thus the correct answer is option C.
  • Question 6
    1 / -0
    In water hyacinth and water lily, pollination takes place by :
    Solution
    In water hyacinth,  that is, Eichhornia the flowers are purple in color, attractive and borne in a spike to facilitate pollination by insects.
    Water lilies, Nymphea species have conspicuous attractive flowers to facilitate insect pollination while some species produce a large number of pollen grains to aid anemophily or wind pollination.
    So, the correct answer is 'Insects or wind'.
  • Question 7
    1 / -0
    Ray florets have
    Solution
    Ray florets are neuter flowers of capitulum inflorescence of the family Asteraceae. Both the ray florets and disc florets have inferior ovary. The ray florets are sterile female flowers while the disc florets are bisexual flowers that produce seeds.
    So, the correct answer is 'Inferior ovary'
  • Question 8
    1 / -0
    Attractants and rewards are required for
    Solution
    Entomophily is the pollination where the insects carry the pollen from the anther to stigma of the flower. In order to sustain the animal visit the flower serve nectar and pollen grain as rewards.
    So, the correct answer is option C.
  • Question 9
    1 / -0
    A dioecious flowering plant prevents both
    Solution
    Autogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of the same flower.
    Geitonogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of another flower of the same plant. 
    A plant having unisexual flowers is said to be dioecious. Such a flower will neither exhibit autogamy nor geitonogamy. 
    Thus the correct answer is option C.
  • Question 10
    1 / -0
    Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by
    Solution
    Wind pollinated flowers have single ovule in the ovary and the flowers are packed into an inflorescence. Pollen are light weight and non-sticky which leads to easy dispersal of the pollen from anther to stigma of the flower by wind. For example, corn cob where the pollens are packed in infloresence.
    So, the correct answer is option D.
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