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Sexual Reproduction in Flowering Plants Test - 72

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Sexual Reproduction in Flowering Plants Test - 72
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  • Question 1
    1 / -0
    Development of fruit without fertilization and are seedless known as 
    Solution
    The process of the formation of the fruits without the process of fertilization is known as parthenocarpy. The fruit is formed without the production of the seeds. This type of seedless fruit variety development is used in the banana and grapes.
    Thus, the correct answer is option C. 
  • Question 2
    1 / -0
    Pappus helps in dispersal of pollen in
    Solution
    Pappus is a modified leaf of Asteraceae family. These hairy structures help in the dispersal of pollen by the wind. This makes the seed light which helps in easy dispersal by the wind.
    So, the correct answer is option A.
  • Question 3
    1 / -0
    Anemophily is not observed in
    Solution

    • In Salvia, there is a special mechanism which is called as the lever mechanism or pipe mechanism. 
    • It favours the pollination method of entomophily where the pollinating agents are the insects. 
    • When a pollinator probes a male stage flower for nectar, then the lever present in the plant causes movement in stamens. 
    • When the pollinator withdraws from the flower, then the lever returns back.
    • Thus, the correct option is D.

  • Question 4
    1 / -0
    Bell shaped flowers are found in 
    Solution
    1. Maize has an inflorescence of spikelets as flowers are born on an axis called rachilla surrounded by bracts.
    2. Datura flower is bell-shaped and a solitary flower.
    3. Chrysanthemum often shows solitary head inflorescence.
    4. Marigold has spike inflorescence means with short or no pedicel are elongated and unbranched peduncle.
    So, the correct option is 'Datura'.
  • Question 5
    1 / -0
    Which of the following is a character of castor plant to avoid autogamy?
    Solution
    • Castor has unisexual flowers carrying either male or female reproductive organs. 
    • Flowers with male reproductive organs (stamen) are termed as staminate flowers while those carrying only carpel are termed as pistillate flowers. Unisexuality helps to avoid autogamy.
      Hence, the correct answer is A. 
  • Question 6
    1 / -0
    During hybridization offsprings with hybrid vigour superior to both parents are self-pollinated for few successive generations to 
    Solution
    C. Get homozygosity
    Reason:  A plant is called homozygous for a particular gene when both alleles are similar at that particular given locus (dominant or recessive). A homozygous plant maintains a high degree of consistency for particular characters determined by the gene throughout the subsequent generations. When both parents are getting self pollinated for few successive generations, the pure charecters are started to be conserved.
  • Question 7
    1 / -0
    In some species of family Asteraceae seeds are produced without fertilisation. It is known as
    Solution
    Apomixis is an asexual method of reproduction in which seed formation takes place without fertilization. 
    Amphimixis is the union of male and female gamete during sexual reproduction. 
    Parthenocarpy is production of fruit without fertilization of egg thus forming seedless fruit. 
    Vivipary is the germination of embryo even when attached to the parent plant. It takes place in mangroves such as Rhizophora.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    Coir of commerce is obtained from
    Solution
    Husk fiber 'Coir of commerce' is obtained from the mesocarp of Coconut (Cocos nucifera).
    So, the correct answer is 'Option B-Mesocarp of coconut'.
  • Question 9
    1 / -0
    The largest fruit is that of
    Solution
    -Largest fruit, as well as the largest seed, is of Lodoicea maldivica (double coconut, weight is 18 Kgs.)
    So, the correct answer is 'Option A- Lodoicea'.
  • Question 10
    1 / -0
    Hilum of seed is
    Solution
    The outer surface of seed shows a scar or mark of attachment with the seed stalk. It is called hilum. There is small pore, called micropyle, which represent the micropyle of ovule.
    So, the correct answer is 'Scar of funiculus'.
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