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Sexual Reproduction in Flowering Plants Test - 54

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Sexual Reproduction in Flowering Plants Test - 54
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  • Question 1
    1 / -0
    Perisperm differs from endosperm in  
    Solution
    Perisperm differs from endosperm in being a diploid tissue. Endosperm is a tissue produced inside the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. These are typically triploid but can vary widely from diploid. Endosperm that is diploid, resulting from the fusion of a pollen nucleus with one, rather than two, maternal nuclei.They are both nutritive layers in a seed. Perisperm develops from the nucellus of the seed and the endosperm develops when the sperm cell fuses with two haploid polar nuclei (contained in the central cell) in the centre of the embryo sac (or ovule). The resulting cell is triploid (3n). This triploid cell divides through mitosis and forms the endosperm, a nutrient-rich tissue, inside the seed. 
  • Question 2
    1 / -0
    The fruit of family umbelliferae is 
    Solution
    Cremocarp is the fruit of family Umbelliferae consisting of a pair of carpels pendent from a supporting axis. The fruits are nonfleshy schizocarp of two mericarps, each with a single seed; they separate at maturity and are dispersed by wind. Some fruit segments are covered in bristles and spread via external transport. The seeds have an oily endosperm and generally contain large quantities of fatty oils, with the fatty acid petroselinic acid occurring universally throughout the family while rarely being found outside of the Apiaceae.
    Therefore, the correct answer is option A.
  • Question 3
    1 / -0
    Coir of coconut is obtained from
    Solution
    The coconut is also a drupe, but the mesocarp is fibrous or dry (termed a husk), so this type of fruit is classified as a simple dry fruit, fibrous drupe. Unlike other drupes, the coconut seed is unlikely to be dispersed by being swallowed by fauna, due to its large size. It can, however, float extremely long distances across oceans.
    Thus, the correct answer is option B.
  • Question 4
    1 / -0
    Which of the following is not a composite fruit? 
    Solution
    Composite fruit is a type of fruit that develops from an inflorescence rather than from a single flower while custard apple fruit develops from a polycarpellary and apocarpous ovary. It forms from the pistils and receptacle of one flower. Custard apple is an example of aggregate fruit.
    Hence, the correct option is C.
  • Question 5
    1 / -0
    In which plant the fruit is a drupe, seed coat is thin embryo, is inconspicuous, and endosperm is edible?
    Solution
    In coconut, the fruit is a drupe, a thin embryo is inconspicuous and endosperm is edible. The coconut is a drupe, a multicarpellary ovary is not found  in coconut. The mesocarp is fibrous or dry, so this type of fruit is classified as a simple dry fruit, fibrous drupe. A drupe otherwise is an indehiscent fruit in which an outer fleshy part-exocarp, or skin and mesocarp or flesh surrounds a shell of hardened endocarp with a seed inside. These fruits usually develop from a single carpel and mostly from flowers with superior ovaries. The definitive characteristic of a drupe is that the hard, lignified stone  is derived from the ovary wall of the flower.
    Therefore, the correct answer is option D.
  • Question 6
    1 / -0
    Wheat grain is 
    Solution
    Wheat grain is caryopsis. A caryopsis is a type of simple dry fruit that is monocarpellate and indehiscent and resembles an achene, except that in a caryopsis, the pericarp is fused with the thin seed coat. The caryopsis is popularly called as a grain and is the fruit typical of the family Poaceae (or Gramineae), which includes wheat, rice and corn. The term grain is also used in a more general sense as synonymous with cereal. Considering that the fruit wall and the seed are intimately fused into a single unit and the caryopsis or grain is a dry fruit, little concern is given to technically separating the terms fruit and seed in these plant structures. 
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    Assertion: Gram, pea and mango show epigeal germination.
    Reason: In epigeal germination, after radicle hypocotyl grows faster.
    Solution
    In hypogeal germination, epicotyl elongates and cotyledons remain underground. 
    In epigeal germination, hypocotyl elongates and pushes cotyledons above the ground. 
    Assertion is wrong because gram, pea and mango shows hypogeal germination.
    Reason is true but it is not the right explanation for given assertion.
    Thus, the correct answer is option C.
  • Question 8
    1 / -0
    Orthodox seeds are those
    Solution
    Orthodox seeds are seeds which will survive drying or freezing during ex-situ conservation. There is variation in the ability of orthodox seeds to withstand drying and storage with some seeds being more sensitive than others. Thus, some seeds are considered intermediate in their storage capability while others are fully orthodox.
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Orchid seeds are
    Solution
    Orchid seeds are small, light and contain little food reserves. A single seed capsule may contain1,500 to 3,000,000 seeds. Orchid seeds are small, dry, dusty and weighing as little as 0.004 mg.
    So, the correct answer is 'small and light'
  • Question 10
    1 / -0
    Seed coat not thin, membranous in 
    Solution
    Seed coat is not thin in coconut. The fruit is an indehiscent fruit in which an outer fleshy part-exocarp or skin and mesocarp or flesh surrounds a shell of hardened endocarp with a seed inside. These fruits usually develop from a single carpel and mostly from flowers with superior ovaries. The definitive characteristic of a drupe is that the hard, lignified stone is derived from the ovary wall of the flower. The coconut is  a drupe, but the mesocarp is fibrous or dry, so this type of fruit is classified as a simple dry fruit, fibrous drupe. 
    Therefore, the correct answer is option A.
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