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Sexual Reproduction in Flowering Plants Test - 97

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Sexual Reproduction in Flowering Plants Test - 97
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  • Question 1
    1 / -0
    Elongated internode between corolla and androecium is
    Solution
    When in a flower, the internode between the corolla and the androecium is lengthened so as to raise the androecium (i.e. stamens ) high up in the air then that internode is called as androphore. In such a case the Gynoecium (ovary) is also raised up automatically as it is situated above the Androecium. Passion flower is a good example . 
    Therefore, the correct answer is option D.
  • Question 2
    1 / -0
    Cotyledons and testa respectively are edible parts in
    Solution
    Seeds are the dispersal and propagation units of the all seed plants which includes gymnosperms and angiosperms. Seeds which develop from an ovule after fertilization consists of a coat or testa that encloses an embryo made up of a plumule, a radicle and one or two cotyledons.
    The testa which needs to split open by the radicle for germination to proceed  protects the seed from fungi, bacteria and insects. The cotyledons which are fleshy in groundnut are edible and in case of pomegranate, the fleshy testa is edible.
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    Which of the following plant seeds are used as "Jeweller's weight"?
    Solution
    • $$Abrus$$  $$precatorius$$ is commonly known as jequirity bean or rosary pea.
    • The seeds of $$Abrus$$  $$precatorius$$ are very consistent in weight , even under different moisture conditions due to the water-impermeable seed coat.
    • Formerly, Indians used these seeds to weigh gold using a measure called Ratti, where 8 Ratti = 1 Masha, 12 Masha = 1 Tola (11.6 Grams). 
    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    Androecium of Papilionadae family is
    Solution
    The filaments of monadelphous stamens are fused into a single, compound structure. When stamen filaments are fused in two groups, it is termed as diadelphous. The filament of polyadelphous stamens are fused and arranged in more than two groups.
    Papilionadeae family is characterized by nine stamen filaments united into a sheath that surrounds the pistil and one separate stamen filament, a condition referred to as diadelphous. 
    Therefore, the correct answer is option B.
  • Question 5
    1 / -0
    The technical term used for the androecium in a flower of China rose (Hibiscus rosa-sinensis) is
    Solution

    A)Correct option (B)
    B) Explanation of the correct option

    • Monoadelphous stamens are fused to a single, composite structure. When connate stamens are joined to two androecial structures, this condition is termed as diadelphous.
    • In China rose, filaments are fused to form a stamina tube, thus it is monadelphous.

  • Question 6
    1 / -0
    The botanical names of Jawar and Rice respectively are
    Solution
    Sorghum is a genus of plants in the grass family. Most species are native to Australia, with some extending to Africa, Asia, Mesoamerica and certain islands in the Indian and Pacific Oceans. One species is grown for grain and many of which are used as fodder plants, either cultivated or as part of pasture. The plants are cultivated in warm climates worldwide and naturalized in many places.
    Sorghum     is in the subfamily Panicoideae and the tribe Andropogoneae. Sorghum vulgare is the botanical name of jawar. Oryza sativa, commonly known as Asian rice, is the plant species most commonly referred to in English as rice. 
    Oryza sativa is a grass with a genome consisting of 430Mb across 12 chromosomes.
    Triticum aestivum (wheat) and Pennisetum typhoides (pearl millet) are not the botanical names of Jawar and Rice. 
    Therefore, the correct answer is option C.
  • Question 7
    1 / -0
    Adhesion in a flower is
    Solution
    Adhesion is union of dissimilar parts of a flower. For example, epipetalous condition in which stamens is attached to petals. Therefore, the correct answer is option A.
  • Question 8
    1 / -0
    In which of the families the stamens are in two whorls and epiphyllous?
    Solution
    Stamens of Malvaceae family are united at their filament level forming on  group and anthers remain free. For exampple, China rose (Hibiscus rosasinensis). 
    Stamens of Solanaceae family are five in number and are present in single whorl. They are epipetalous (stamens are fused with petals). For example, Solanum tuberosum. 
    Caesalpinioideae is a subfamily of family Fabaceae. They possess 10 stamens as 9+1 (9 in one bundle and remaining 1 as separate). They are free and are not united with any other part of the flower. 
    Liliaceae stamens are six in number and are arranged in two whorls. They are present in epiphyllous condition (fused with perianth). For example, Lily and Garlic (Allium cepa). 
    Therefore, the correct answer is option C.
  • Question 9
    1 / -0
    Number of stamens present in malvaceae is
    Solution
    Number of stamens present in Malvaceae is infinite. The stamens are five to numerous, and connate at least at their bases, but often forming a tube around the pistils. The pistils are composed of two to many connate carpels. The ovary is superior, with axial placentation, with capitate or lobed stigma. The flowers have nectaries made of many tightly packed glandular hairs, usually positioned on the sepals.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    In gymnosperms, the pollination is
    Solution
    Ingymnosper pollination occurs by the wind as they do not produce flowers to attract the infects. In this pollination male gametophyte is directly transfer to the female cone and through the pollen tube, it travels to the fuse with female gametophyte through the micropylar end.
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