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Sexual Reproduction in Flowering Plants Test - 36

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Sexual Reproduction in Flowering Plants Test - 36
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  • Question 1
    1 / -0
    Ubisch bodies found in tapetal cell helps in the formation of 
    Solution
    The small acellular structures of sporopollenin is known as ubisch bodies. These are also known as orbicules. These are produced as a byproducts of pollen wall sporopollenin synthesis. It helps in pollen development. It is mainly found in the extracellular matrix of the tapetal cells which helps in the formation of exine.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Germpore is the region where the exine is
    Solution
    Germ pore is the opening found in pollen, where exine (outer wall) is absent.

  • Question 3
    1 / -0
    One advantage of cleistogamy is 
    Solution
    Cleistogamy is a type of self-pollination that is seen in permanently closed Self-pollinating flowers. These flowers are called as cleistogamous flowers. Self-pollination leads to lesser genetic diversity. Seed dispersal does not takes place in it due to closed flowers. Seed set is not dependent on pollinators as they are self fertilized. 
    Thus, the correct answer is 'Seed set is not dependent on pollinators.'
  • Question 4
    1 / -0
    Endogamy in plants is the term, where
    Solution
    Endogamy is the type of pollination in which the pollen from the anthers of a flower reaches the stigma of another flower of the same plant.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    Unisexuality of flowers prevents
    Solution
    Correct Option: C
    Explanation:

    • A unisexual flower is a flower that contains three whorls such as petals, sepals, the male reproductive structure (stamen) or the female reproductive structure (pistil). 
    • Autogamy is pollination by the transfer of pollen grains from the anther of a flower to the stigma of the same flower.
    • Geitonogamy is the pollination by transfer of pollen grains from the anther of a flower to the stigma of another flower of the same plant.
    • Thus, a unisexual flower cannot show autogamy but geitonogamy is possible.
    • Hence, the unisexuality of flowers that is the presence of either stamens or carpels can prevent autogamy but not geitonogamy. 
  • Question 6
    1 / -0
    When pollen grains of a flower pollinate the stigma of another flower of the same plant, it is called as 
    Solution
    Geitonogamy is the transfer for pollen grains from anthers of one flower to another flower of either the same plant or genetically similar plant or between two clones.
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    Which of the following is pollinated by water?
    Solution
    Zostera is a small genus of widely distributed seagrass, commonly called marine eelgrass. In Zostera, hydrophily is the method of pollination.
  • Question 8
    1 / -0
    Pollination by wind is called as 
    Solution
    Anemophily or wind pollination is a form of pollination whereby pollen is distributed by the wind. 
    Geitonogamy is the pollination between two flowers of the same plant.
    Autogamy is the pollination of a flower from its own pollen grain.
    Malacophily is the pollination of a flower from the snail.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    In which of the following, pollination takes place by lever mechanism?
    Solution
    • The flowers in Salvia are arranged in thysrus inflorescence. They are attractive and well adapted for cross-pollination through the agency of insects.
    • These flowers show lever mechanism in which the corolla has a spreading upper lip. and a lower lip. These flowers have long bifurcated connectives. 
    • When the insects land on the lower lip of the corolla to obtain the nectar it pushes the sterile lobes of the stamen inwards. 
    • Hence the anther lobes come down and shed the pollen on the back of the insect. This results in its pollination. 
    Thus the correct answer is option A.
  • Question 10
    1 / -0
    Fig is pollinated by 
    Solution
    Fig is an inflorescence and not a fruit made up of many clusters of flowers and seeds inside its bulbous stem. Thus is requires a special pollinator to pass through this unusual arrangement of fig. Fig is pollinated by tiny insects called fig wasps which manage to enter into the fig by a tiny bract lined opening at the apex of fig called ostiole. It has tightly closed bracts through which only tiny wasp can enter which is brought about by her flat and elongate body and rows of teeth on her mandibular appendage. Wind, water and itself it is not possible to pollinate such an inflorescence with fully enclosed flowers. 
    Thus, the correct answer is option D. 
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