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Sexual Reproduction in Flowering Plants Test - 71

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Sexual Reproduction in Flowering Plants Test - 71
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  • Question 1
    1 / -0
    In castor and maize plants, 
    Solution
    • In maize and castor plants, unisexual flowers are present. 
    • The flowers are known as unisexual when there are separate sex organs in separate flowers. 
    • However, both the male and female flowers can be present on the same plant. Since there are separate flowers which prevent autogamy. 
    • But both the flowers are borne on the same plant. This induces the chances of geitonogamy. 
    Thus, the correct answer is option A. 
  • Question 2
    1 / -0
    Malacophily is the pollination by
    Solution
    The cross-pollination through mammals is called anthropophily. The cross pollination through snail is called as malacophily. The cross-pollination through birds is called as ornithophily. Whereas the cross-pollination through insect is called as entomophily. 
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    Lever mechanism of pollination is observed in
    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.
    Thus, the correct answer is option A.
  • Question 4
    1 / -0
    Cross-pollination through insect agent is called as
    Solution
    The cross-pollination through humans is called anthropophily. THe cross pollination through snail is called as malacophily. The cross-pollination through birds is called as ornithophily. Whereas the cross-pollination through insect is called as entomophily. Such flower is called as entomophilus flower which possess special characters like open, colourfull and nectar producing flower and they possess sticky pollens. Thus, the correct answer is option C.
  • Question 5
    1 / -0
    Which of the following structure/arrangement favours entamophily the most?
    Solution
    Pollination through insect is called as entamophily in which insect is attracted by nectar secreted by flower and colorful petals.
    So the correct option is 'Colourful petals and nectar secretion.'
  • Question 6
    1 / -0
    Anemophilly occurs in ................
    Solution
    Wind pollination is also known as Anemophily, coconut plants were pollinated by both wind and insects.
    So the correct option is 'Coconut.'
  • Question 7
    1 / -0
    Out of the following factors, cross-pollination does not take place due to 
    Solution
    Cross pollination is the process in which the pollen from one flower is transferred onto the stigma of the another flower. Light is not involved in the transfer of the pollen grain. Wind, water and animals are the factors which help in the cross-pollination of flowers in the plants which produce unisexual flowers. 
    Thus, the correct answer is option C. 
  • Question 8
    1 / -0
    Post-fertilization, the ovule changes into a/an
    Solution
    • During fertilisation, there is a fusion of the male and the female gametes. 
    • In the case of angiosperms, there is a phenomenon called as double fertilisation. 
    • There is a formation of zygote and endosperm after triple fusion. The zygote gets transformed to form the embryo. 
    • The ovule gets converted to seed and the ovary develops to form the fruit. the integuments form the seed coat. 
    Thus, the correct answer is option A. 
  • Question 9
    1 / -0
    The flower is important to a plant because it helps in
    Solution
    All the flowers are important to plant as they attract pollinators by producing nectar, attracting pollinators and helps to plants in the reproduction process by pollination.
    So, the correct option is 'All of the above.'
  • Question 10
    1 / -0
    Which one of the following is a non-endospermic seed?
    Solution
    • The endosperm is a food-laden tissue, surrounding the embryo on all sides or either present on one side of the embryo. Depending on its presence or absence, seeds are of two types:
    (i) Non-endospermic or exalbuminous seeds:
    In these seeds like gram, pea, groundnut, the endosperm is completely consumed by the embryo.
    (ii) Endospermic or albuminous seeds:
    In monocots and castor bean (dicots), the embryo does not consume all endosperm. So it persists in the mature seed. Such seeds are called endospermic or albuminous seeds. In these seeds, food is stored in the endosperm. In monocot seeds, the membranous covering present around the radicle is called coleorhiza and around plumule is called coleoptile.

    Hence the answer is "Groundnut".
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