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Sexual Reproduction in Flowering Plants Test - 63

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Sexual Reproduction in Flowering Plants Test - 63
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  • Question 1
    1 / -0
    The megasporangium of the angiosperms on maturation gives rise to
    Solution
    In the angiosperms, ovule is found that contains embryo sac. Ovule is the basis of female reproductive structure that further develops into a seed after fertilization. It consists of a megasporangium surrounded by one or two layers of tissue called integuments. The megasporangium produces spores that develop into megagametophyte. The megagametophyte produce one or more egg cells. Pollen grains enter the ovule through an opening called micropyle and fertilize the egg cells. The resulting embryo develops within the ovule and becomes a seed. 
  • Question 2
    1 / -0
    The chief pollinators of our agri-horticultural crops are
    Solution
    Bees are the most effective pollinators which spent most of their lifetime in collecting pollen to feed their offsprings. At least 30%of 1,500 crop plant species depend on pollination by bees.
    So the correct option is 'Bees.'
  • Question 3
    1 / -0
    In Ficus religiosa (peepal), the pollination is affected by
    Solution
    • Blastophaga quadriceps, the legitimate pollinator of Ficus religiosa, possesses two thoracic pockets in which pollen is stored for subsequent introduction into the young figs.  
    • Pocket loading takes place in the nearly ripe fig at the male phase. Impregnated female wasps leave the fig via narrow channels bored by the males. 
    • Upon entering young receptive figs, the female wasps begin oviposition, during which pocket emptying and pollination takes place.
  • Question 4
    1 / -0
    A very close relationship between flower and pollinating agent is best exhibited by
    Solution
    Yucca (Yucca glauca), maintains a good relationship between a pollinator and its equal flower. This is called an obligate mutualism in which if one were to disappear, the other would follow the same path. 
    So the correct option is 'Yucca.'
  • Question 5
    1 / -0
    In Salvia, the pollination is affected by
    Solution
    • The pollination mechanism in Salvia is a unique lever type. The flowers in this genus are arranged in thyrsus inflorescence and they are attractive and well adapted for cross-pollination through the agency of insects. 
    • In this lever mechanism of pollination, the Corolla has a spreading upper lip, which acts as a landing place for the insect. When the insects land on the lower lip of the corolla and in its endeavor to obtain nectar that is secreted by the hypogynous disc, pushes the sterile lobes of the stamen inwards.
    •  Due to this the upper half of the connective with the fertile lobes acts as a lever. Then the anther lobe comes down and shed the pollen on the back of the insect.

     So, option D is correct.
  • Question 6
    1 / -0
    Lever mechanism for pollination is characteristic feature of
    Solution
    Pollination mechanism in Salvia is a unique lever type. The flowers in this genus are arranged in thyrsus inflorescence and they are attractive and well adapted for cross-pollination through the agency of insects. In this lever mechanism of pollination, the Corolla has a spreading upper lip, which acts as a landing place for the insect. When the insects land on the lower lip of the corolla and in its endeavour to obtain nectar that is secreted by the hypogynous disc, pushes the sterile lobes of the stamen inwards. Due to this the upper half of the connective with the fertile lobes act as a lever. Then the anther lobe comes down and shed the pollen on the back of the insect.
  • Question 7
    1 / -0
    Morphologically the white fluffy edible mass in maize is
    Solution
    Endosperm develops after the formation of embryo. It functions as the nutritive tissue for the growing embryo. The endosperm is found as liquid (coconut water) and solid (coconut kernel, white fluffy part of maize). The endosperm found in maize is of nuclear type. 
  • Question 8
    1 / -0
    Which of the following terms describes pollination by the agency of ants?
    Solution
    Pollination is the transferring of pollen grains from the male anther of a flower to the female stigma. Pollination by the agency of ants is called myrmecophily. Pollination by bats, insects and birds are called cleiropterophily, entomophily and ornithophily respectively. 
  • Question 9
    1 / -0
    The male gametophyte is called as
    Solution
    The pollen grain is the male gametophyte which contains the male gametes. It is surrounded by two layers as exine which forms the outer layer and intine which forms the inner layer. The generative cell divides to form the two male gametes. The intine layer comes out of the germ pore to form the pollen tube.
    Thus, the correct answer is option C. 
  • Question 10
    1 / -0
    Flowers which are pollinated by insects are
    Solution
    • Insect-pollinated flowers have large, bright, scented and colourful petals so that insects would be attracted to the flower. 
    • Also, they have nectar near the receptacle on the interior of the flower. So, the insects will enter the flower and can aid in pollination where the pollen grains from the anther in the flower gets scraped onto the insect to be transferred to the stigma of another flower. This form of pollination is known as Entomophily

    So, the correct answer is 'Large, coloured and scented'
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