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Sexual Reproduction in Flowering Plants Test - 78

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Sexual Reproduction in Flowering Plants Test - 78
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  • Question 1
    1 / -0
    Apomixis is
    Solution

    Correct Option: B

    Explanation:

    • Apomixis is the formation of new individuals of seeds with embryo growing directly from diploid cells of nucellus or integument (as in Mango and Orange), diploid egg or some other gametophytic cell (as in Apple, Rubus, etc.).
    Hence, apomixis is development of plants without the fusion of gametes.

  • Question 2
    1 / -0
    Development of embryo from a cell of embryo sac other than egg is an example of
    Solution
    • Apospory is the development of gametophyte from the cells of sporophyte without the formation of spores.
    • Apogamy is the development of sporophyte from a cell of embryo sac gametophyte other than oosphere without the fusion of gametes.
    • In adventive embryogeny, there is a formation of extra embryos due to sporophytic budding. One or more sporophytic cells, either nucellus or integuments undergo stages of embryogeny and eventually develop into mature embryos.
    • Parthenogenesis is the formation of an embryo from unfertilized egg or female gamete.
    Hence, development of an embryo from a cell of embryo sac other than the egg is an example of Adventive embryogeny.
    So, the correct answer is C.
  • Question 3
    1 / -0
    Yucca is pollinated by.
    Solution

    Yucca is the pollinated by a moth known as the Tegeticulla yuccasella.  Each spring, adult moths emerge from the underground cocoons. And the males and females meet up with each other on Yucca plants for mating.

    The Yucca moth is also termed as the pronuba moth. It is a small white moth that lives in the semi-arid habitats where Yucca plants grow.

    Thus the correct answer is A.

  • Question 4
    1 / -0
    Pollen grains are shed at.
    Solution
    Pollen grains are generally shed at two celled stage in 60% angiosperms. Sometimes in others it can also shed at three celled stage.
    So, the correct option is B.
  • Question 5
    1 / -0
    Fragrant flowers with well developed nectaries are an adaptation for
    Solution
    Fragrant flowers with well-developed nectaries are an adaptation for entomophily. In entomophily, insects are the pollinating agents. These are the most common biotic agents of pollination. Bees are the most common insect which acts as pollinating agents. Other insect pollinators are butterflies, flies, beetles, wasps, ants, moths. Majority of insect-pollinated flowers are large-sized. These flowers are colorful and possess fragrance to attract the insects. Nectar is given as a reward to insects. Thus, option C is correct.
  • Question 6
    1 / -0
    The phenomenon of embryo formation from a vegetative cell derived from zygote is known as
    Solution
    •Apospory is the formation of gametophyte from the sporophytic cells without the formation of spores.
    •Adventive Polyembryony is a type of Apomixis in which there is formation of embryo due to sporophytic budding. One or more diploid sporophytic cells, either nucellus or integuments undergo stages of embryogeny and eventually develop into mature embryos.
    •Apomixis is a kind of asexual reproduction in which viable embryo is formed within the confines of the seed coat, without meiosis and syngamy. Hence, embryo formation from a vegetative cell derived from zygote is known as Adventive Polyembryony because zygote will form the sporophytic plant body and any sporophytic cell may undergo stages of embryogeny to form the embryo.
    So, the correct answer is C.
  • Question 7
    1 / -0
    Malacophily is observed in.
    Solution
    Malacophily is the process of pollination of plants by snails which is well observed in Lemna.
    So, the correct option is C.
  • Question 8
    1 / -0
    Despite high level of heterozygosity, the progeny derived from a seed of cross pollinated plant was found to be completely uniform. One reason can be.
    Solution
    Since apomixis is an unusual sort of sexual propagation in which egg or different cells related with egg form into developing a life without preparation and with or without meiosis.
    So, the correct option is 'Apomixis'.
  • Question 9
    1 / -0
    Maize shows
    Solution
    Maize which is also known as Corn plant is pollinated by wind. The anthers are born in long tassels that move with the wind and shake off their pollen. The stigma is feathery and hairy so as to catch the wind-borne pollen. Thus, in maize, pollens are transferred from the anthers of one plant to the stigma of another plant by means of wind i.e. cross-pollination occurs by the wind.
    So, the correct answer is B. 
  • Question 10
    1 / -0
    Formation of an extra embryo from nucellus or integument is
    Solution
    • Simple Polyembryony is the occurrence of more than one embryo in the same seed.
    • Adventive Polyembryony is a kind of Apomixis in which there is a formation of extra embryos due to sporophytic budding. One or more diploid sporophytic cells, either nucellus or integuments undergo stages of embryogeny and eventually develop into mature embryos.
    • Cleavage Polyembryony involves the cleavage of an embryo in which a single fertilized egg forms a number of embryos. The zygote divides several times irregularly to form a mass of cells which can develop into embryos.
    Hence, the formation of an extra embryo from nucellus or integument is called adventive polyembryony. 
    So, the correct answer is B.
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