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Sexual Reproduction in Flowering Plants Test - 64

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Sexual Reproduction in Flowering Plants Test - 64
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  • Question 1
    1 / -0
    Lever mechanism for pollination is characteristic feature of 
    Solution
    Lever mechanism for pollination is characteristic feature of Salvia. The flowers in this genus are arranged in thysrus inflorescence and they are attractive and well adapted for cross pollination through the agency of insects. In this mechanism of pollination, the corolla has a spreading upper lip, which acts as a landing place for the insect. When the insects land on the lower lip of the corolla and in its endeavour to obtain nectar that is secreted by the hypogynous disc, pushes the sterile lobes of the stamen inwards. Due to this the upper half of the connective with the fertile lobes act as a lever. Then the anther lobe comes down and shed the pollen on the back of the insect.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Pollination is a characteristic of 
    Solution
    Angiosperms, also called flowering plants which undergo pollination before they can reproduce. Angiosperms have male sex organs called stamens. 
    So the correct option is 'Angiosperms.'
  • Question 3
    1 / -0
    Flowers, which are pollinated by insects, are
    Solution
    Insects visit flowers that are open during the day. They are large, brightly coloured and have a strong scent. They have a tubular shape and a nectar guide. A nectar guide is regions on petals that are visible only to bees. This portion guides the bees to the centre of the flower helping in pollination. Thus the correct answer is option C.
  • Question 4
    1 / -0
    The biotic relationship between insects and plants with reference to pollination is called
    Solution
    Insects such as bees collect energy-rich pollen or nectar for their survival and energy needs from flowers. They visit flowers that are open during the day. During this time the pollen sticks to the bee's hair. When this bee visits another flower, some of the pollen is transferred to it resulting in pollination. As the bee and plant, both are benefited it is a mutualistic relation. Thus the correct answer is option B.
  • Question 5
    1 / -0
    The chief pollinators of our agri-horticultural crops are
    Solution
    Bees are the most effective pollinators which spent most of their lifetime in collecting pollen to feed their offsprings.
    So the correct option is 'Bees.'
  • Question 6
    1 / -0
    When pollen of a flower is transferred to the stigma of another flower of the same plant the pollination is referred to as 
    Solution
    Autogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of the same flower.
    Allogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of a flower of another plant of the same species.
    Xenogamy is the pollination of a flower by pollen from another flower of a plant of different species.
    Geitonogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of another flower of the same plant. 
    Thus the correct answer is option D.
  • Question 7
    1 / -0
    Entomophily is pollination by 
    Solution
    Entomophily is pollination of flowers by insects. Insects such as butterflies, moths and bees visit flowers for nectar. During this time the pollens stick onto their body. When the same insect visits another flower it transfers the pollen to the stigma of that flower leading to pollination. Thus the correct answer is option D.
  • Question 8
    1 / -0
    Flowers, which are pollinated by insects, are 
    Solution
    Insects such as butterflies, moths and bees visit flowers for nectar. These flowers have to be large, colored, showy and scented so that they can be easily spotted by insects. While feeding on nectar the pollens attach onto their body. When the same insect visits another flower it transfers the pollen to the stigma of that flower leading to pollination. Thus the correct answer is option C. 
  • Question 9
    1 / -0
    In Ficus religiosa (peepal) the pollination is affected by 
    Solution
    Pollination is the process by which pollen is transferred from the anther to the stigma of the plant, thereby enabling fertilization and reproduction. In Ficus religiosa also known as Peepal tree, the pollination is affected by insects especially the small wasps which crawl through the opening of inflorescence in search of a suitable place to lay eggs and hence aids in pollination.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    A plant has $$24$$ chromosomes in microspore mother cell. The number of chromosomes in its endosperm will be
    Solution
    The inner diploid sporogenous tissue of each microsporangium first undergoes mitotic divisions to increase the cell number and then differentiates into microspore/pollen mother cell. Being the product of mitosis in diploid cells, microspore mother cells are diploid i.e. carry two complete sets of chromosomes. Double fertilization is characterized by fusion of one male gamete fuses with egg nucleus (syngamy) to form the diploid embryo and that of other with diploid secondary nucleus/central cell (triple fusion) to form triploid primary endosperm nucleus which in turn divides to form large nutritive endosperm. This makes endosperm triploid being the product of triple fusion between the diploid secondary nucleus and haploid male gamete. Therefore, if microspore mother cell has 2n= 24 chromosomes, the triploid endosperm will have 3n= 36 chromosomes. Thus, the correct answer is option A.
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