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Sexual Reproduction in Flowering Plants Test - 65

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Sexual Reproduction in Flowering Plants Test - 65
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  • Question 1
    1 / -0
    Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as 
    Solution
    Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as aril. It is typically coloured, hairy and fleshy structure. It is edible in some of the species of plant. It helps in pollination as the insects gets attracted by its beautiful colour.
  • Question 2
    1 / -0
    Which of the following terms describes pollination by the agency of ants? 
    Solution
    Cheiropterophily is pollination of flowers by bats.
    Entomophily is pollination of flowers by insects. 
    Ornithophily is pollination of flowers by birds. 
    Myrmecophily is pollination of flowers by ants.
    Thus the correct answer is option D.
  • Question 3
    1 / -0
    Cleistogamous flowers are invariably autogamous because
    Solution
    Cleistogamous flowers mean anther and stigma lie close each other in the closed flower. They are bisexual which cannot open even at maturity and thus self-pollination occurs. As they are closed consider as invariable autogamous.
    Thus, the correct answer is A.
  • Question 4
    1 / -0
    External water is not essential for fertilisation in  
    Solution
    Spermatophyta is the seed producing plants. These plants comprise of the gymnosperms and angiosperms which produce seeds. The plants are advanced and produce male and female gametes which are fused by different methods of fertilization. There is no need of external water for the movement of gametes in the process of fertilization as in the case of lower plants
    So, the correct answer is 'Spermatophyta'
  • Question 5
    1 / -0
    The insect Blastophaga grossorum is associated  with the pollination of 
    Solution
    Blastophaga grossorum is a wasp that specifically pollinates Ficus species. They exhibit a co-evolutional relationship existing for millions of years now. Blastophaga locates the ficus plant using its olfactory senses. This is an example of fig-wasp mutualism.
    So, the correct answer is, 'Ficus'.
  • Question 6
    1 / -0
    In coconut black covering (thin layer) adherent to the kernel around the endosperm is 
    Solution
    In the case of coconut plant, the hard shell forms the inner layer of fruit (endocarp). Inside the shell, there is a seed which is covered by a seed coat. This seed coat is brown in colour and attached to the kernel which is endosperm. The seed coat is a thin layer which is protective in nature. 
  • Question 7
    1 / -0
    Plants are able to produce fruits with the help of insects as they are __________________.
    Solution
    • Pollination is a process of transfer of pollen grain (male gamete) to the stigma (part of the female reproductive unit) which results in fertilisation and formation of seed takes place. 
    • The process of pollination takes place with the help of biotic and abiotic agents. 
    • The abiotic agents are wind and water while biotic agents are insects, bats, birds, snails, etc. Fruits are produced after fertilisation. 
    • Thus, plants can produce fruits with the help of insects as they are pollinators.
    So, the correct answer is option B.
  • Question 8
    1 / -0
    Entomophily is pollination by
    Solution
    Entomophily is a form of pollination whereby pollen or spores are distributed by insects. Several insects are reported to be responsible for the pollination (potential or effective) of many plant species, particularly bees, Lepidoptera (butterflies and moths), wasps, flies, ants and beetles.  
    Therefore, the correct answer is option D.
  • Question 9
    1 / -0
    Morphologically the white fluffy edible mass in maize is 
    Solution
    The monocot plants are known for the presence of the embryo and edible endosperm in the seed. The endosperm is large, whitish and fluffy in the case of the maize. The endosperm of the maize is considered as edible which is used for the production of popcorn. The endosperm swells and comes out to form the popcorn which is highly nutritious.
    Thus, the correct answer is option B. 
  • Question 10
    1 / -0
    When pollen of a flower is transferred to the stigma of another flower of the same plant, the pollination is referred to as
    Solution
    Self-pollination is when pollen from the same plant arrives at the stigma of a flower or at the ovule (in gymnosperms). 
    There are two types of self-pollination. 
    • In autogamy, pollen is transferred to the stigma of the same flower. 
    • In geitonogamy, pollen is transferred from the anther of one flower to the stigma of another flower on the same flowering plant, or from microsporangium to ovule within a single (monoecious) gymnosperm. 
    Some plants have mechanisms that ensure autogamy, such as flowers that do not open, or stamens that move to come into contact with the stigma. In plants, allogamy is used specifically to mean the use of pollen from one plant to fertilize the flower of another plant. Xenogamy is fertilization of a flower by pollen from a flower on a genetically different plant.
    Therefore, the correct answer is option D.
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