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Sexual Reproduction in Flowering Plants Test - 87

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Sexual Reproduction in Flowering Plants Test - 87
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Polyembryony was discovered by
    Solution
    Polyembryony is the phenomenon in which two or more embryos develop from a single fertilized egg. It was discovered by Leeuwenhoek. He observed the formation of two plantlets from the same citrus seed.
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    The number of synergids and antipodals present in a typical angiosperm embryosac at maturity respectively are 
    Solution
    Within the embryo sac, there is a characteristic distribution of cells. At the micropylar end, three cells are grouped together which constitute the egg apparatus. The egg apparatus, in turn, consists of two synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip. There are three cells at the chalazal end called the antipodals.
    So, the answer is A.
  • Question 3
    1 / -0
    What would be the genetic nature of apomictic embryos?
    Solution
    Apomictic embryos are the embryos which are formed without the process of fertilization and they are directly developed from the diploid egg present in the embryo sac. Sometimes there will be no proper mitotic and meiotic divisions in the embryo sac which leads to the formation of diploid egg. This diploid egg directly develops into a new organism. As there is no fertilization, the newly formed embryo is genetically similar to the parent and otherwise also known as the clone. 
    So, the correct option is B. Genetically similar.
  • Question 4
    1 / -0
    Member of plantae having endospermic, perispermic, polycotyledonous and winged seeds is also related to
    Solution

    Members of plantae having endospermic, perispermic, polycotyledonous, winged seeds are coniferous plants. These plants show release of pollen grains is called shower of sulphur dust.

    So, the correct option is ‘Sulphur shower’.
  • Question 5
    1 / -0
    Name the plant shows adventive embryonic cells.
    Solution
    Adventive embryonic cells are those embryonic cells which are developed directly from the diploid nucellus or integument of ovule without fertilization. These embryos do not involve meiosis and sexual fusion. These embryos are also called as somatic embryos. Example includes citrus, mango, jamun, rose apple.
    Thus, the correct answer is option B.
  • Question 6
    1 / -0
    Zygote of Capsella bursapastoris divides through
    Solution

    The zygote of the Capsella bursa pastoris undergoes longitudinal division, as depicted in the attached image.

    So, the correct answer is 'Longitudinal division'.

  • Question 7
    1 / -0
    Choose the correct answers from the alternatives given.
    The process of pollen transfer from anther to stigma of a flower is known as ________.
    Solution
    Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. One of the ways that plants can produce offspring is by making seeds. Seeds are made at the base of the pistil, in the ovule. To be pollinated, pollen must be moved from a stamen to the stigma. When pollen from a plant's stamen is transferred to that same plant's stigma, it is called self-pollination.
    So, the correct option is, 'pollination'.
  • Question 8
    1 / -0
    Endosperm is absent in
    Solution
    During double fertilization, the fusion of one sperm with the egg cell forms the embryo and that of the other sperm with a polar nucleus gives rise to the endosperm. The families that lack an endosperm include Orchidaceae, Podostemaceae, and Trapaceae.

    So, the correct answer is 'All the above'.
  • Question 9
    1 / -0
    Self fertilisation is seen in
    Solution
    Self-fertilization, the fusion of male and female gametes (sex cells) produced by the same individual. Self-fertilization occurs in bisexual organisms, including most flowering plants. A unisexual flower possesses either stamens or carpels but not both. A plant may be unisexual (dioecious), possessing only male flowers or female flowers. Papaya flower is called unisexual because it posses either male or female reproductive part. The features of unisexual flowers are that they are aromatic and colorful so that they could attract insects for transfer of pollen grains.
    So, the correct answer is 'Unisexual flower of papaya'.

  • Question 10
    1 / -0
    Endosperm, a product of double fertilisation in angiosperms is absent in the seeds of-
    Solution
    Correct option:(B)\textbf{Correct option:(B)}

    Explanation for correct option:\textbf{Explanation for correct option:}

    ∙\bullet Endosperm is a nourishing tissue present in the seed which nourishes the developing embryo. 

    ∙\bullet Generally dicots have non-endospermic/exalbuminous seeds as endosperm is absent in mature seeds. Example: Pea, bean and gram

    ∙\bullet In some dicot seeds such as Castor, endosperm is formed as a result of double fertilisation. Such seeds are endospermous.

    ∙\bullet Generally monocots have endospermic/albuminous seeds as the seeds shows the presence of endosperm. Example: Coconut, Maize

    ∙\bullet Orchid is a monocot but in it endosperm is absent because it is used up during the time of seed development. 

    ∙\bullet Nourishment for germinating seed is provided by the food material present in cotyledons. 

    ∙\bullet Hence the correct option is (B)
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