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Sexual Reproduction in Flowering Plants Test - 38

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Sexual Reproduction in Flowering Plants Test - 38
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  • Question 1
    1 / -0
    A close relation between flower and pollinating agent is best exhibited by 
    Solution
    The Yucca moth pollinates the Yucca plant. The moth and the shape of the flower have adapted to allow successful pollination of Yucca plant. The moth deposits pollen on the sticky stigma for fertilization to occur later. The female moth also deposits eggs. As the eggs develop into larvae, they obtain food from the flower and developing seeds. Resulting in both the insect and flower benefitting from each other in this symbiotic relationship.
    Therefore, the correct answer is option C.
  • Question 2
    1 / -0
    In Salvia, pollination takes place by 
    Solution
    In Salvia, there is a special mechanism called as lever mechanism or turn pipe mechanism. This favours the pollination method of entomophily where the pollinating agents are insects. When a pollinator probes a male stage flower for nectar, the lever present in the plant causes the stamens to move and the pollen to be deposited on the pollinator. When the pollinator withdraws from flower, the lever returns to their original position.
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    The endosperm of Brassica is 
    Solution
    Brassica is an example for angiospermic plant. Thus, the endosperm is triploid in nature. In angiosperms double fertilization will take place as a result of triple fusion.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    If the number of chromosomes in endosperm of a dicot plant is 36, the root cells will contain 
    Solution
    Correct Option: C
    Explanation:
    Endosperm is a triploid in nature, it means it has three times the number of haploid number of chromosomes of the cell. Therefore,
    3N= 36
    N= 12
    We know that, Roots cells are diploid in nature therefore chromosome number of root cell as per the question will be 24 chromosomes.

  • Question 5
    1 / -0
    Which one is an example of triploid tissue?
    Solution
    Maize and lily are angiosperm plants, in which the endosperm is formed by fusion of one diploid polar nucleus and halpoid male gamete, thus this tissue is triploid.
  • Question 6
    1 / -0
    Which of the following is a non-endospermic monocot seed?
    Solution
    Endosperm is the tissue formed inside the seed. It surrounds embryo and provides nutrition. Mostly monocots have endospermic or albuminous seed and dicots have non-endospermic seed. But one of the exceptions is Alisma seed which is a monocot plant but with non-endospermic seed. Thus, the correct answer is 'Alisma.'
  • Question 7
    1 / -0
    If an angiosperm male plant is diploid and female plant is tetraploid, the ploidy level of endosperm will be ____.
  • Question 8
    1 / -0
    The best example of polyembryony is 
    Solution
    Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg. Polyembryony occurs regularly in many plants and animals, e.g., Pinus.
  • Question 9
    1 / -0
    Nucellar embryo is an
    Solution
    Nucellar embryony is a form of seed reproduction that occurs in certain plant species. During the development of seeds from plants that possess this genetic trait, the nucellar tissue which surrounds the megagametophyte can produce additional embryos which are genetically identical to the parent plant. Nucellar embryo is apomictic diploid. Substitution of usual sexual reproduction by a form of reproduction which does not include meiosis and syngamy is called apomixis. In this technique, embryo is developed by some other tissue without fertilization e.g., nucellus or integuments or infertilized egg. Nucellus in a diploid tissue so nucellar embryo is apomictic diploid. So, the correct answer is option D.
  • Question 10
    1 / -0
    Dicot embryo consists of 
    Solution
    Dicot embryo consists of radicle, plumule, cotyledons and sometimes endosperm. Radicles will develop to form roots, plumule will give rise to shoot and cotyledons will help in providing nourishment to the growing embryo.
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