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Sexual Reproduction in Flowering Plants Test - 91

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Sexual Reproduction in Flowering Plants Test - 91
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  • Question 1
    1 / -0
    In gymnosperms, the pollination is
    Solution
    In gymnosperms pollination only occurs by wind i.e pollination is anemophilous. During pollination, pollen grains are blown by the wind to land on the female cones. Also during pollination, the pollen grains are transferred directly to the ovule as the ovules are exposed directly on the surface. Hence, pollination is not stigmatic but micropylar (micropyle being a small opening in the surface of the ovule).
    So, the correct answer is 'Anemophilous- micropylar'.
  • Question 2
    1 / -0
    Albumin is also known as _________.
    Solution
    Perisperm is nutritive tissue outside embryosac. 
    Synergid is supportive tissue. 
    Plumule is involved  in the formation of shoot system. 
    Endosperm is nutritive tissue and is also called albumin.
    So, the correct option 'Endosperm'.
  • Question 3
    1 / -0
    Caruncle of albuminous dicot seed is derived from
    Solution
    The caruncle is the white spongy outgrowth of the micropyle seen in some species and derived from embryo. It absorbs water readily so that it may be of some use in germination.
    So the correct answer is 'Embryo'.
  • Question 4
    1 / -0
    polyembryony is recorded in which angiosperm plant?
    Solution
    Polyembryony is the condition where multiple embryos are formed from a single fertilized egg , this is seen in citric fruits such as orange , lemon ,etc .
    So, the correct answer is  'lemon'
  • Question 5
    1 / -0
    In monocot embryo, epicotyl has a shoot apex and few leaf primordia enclosed in a hollow foliar structure called
    Solution
    Coleoptile is a foliar (leaf shaped) structure enclosing epicotyl bearing shoot apex and leaf primordia.
    Functions of Coleoptile:-
    • It has a terminal pore for the emergence of the first leaf.
    • It protects the plumule during emergence from the soil.
    • During germination, it does photosynthesis.
    So, the correct option is 'Coleoptile'.
  • Question 6
    1 / -0
    Which of the following options is correct?
    Solution
    Pollination does not guarantee the transfer of the right type of pollen. Often, pollen of the wrong type also lands on the stigma. The pistil has the ability to recognize the pollen, whether it is of the right type (compatible) or the wrong type (incompatible). If it is of the right type, the pistil accepts the pollen and promotes post-pollination events that lead to fertilization. If the pollen is of the wrong type, the pistil rejects the pollen by preventing pollen germination on the stigma or the pollen tube growth in the style. Events from pollen deposition on the stigma until pollen tubes enter the ovule are together referred to as pollen-pistil interaction. Pollen-pistil interaction is a dynamic process involving pollen recognition followed by promotion or inhibition of the pollen. 

    So the correct option is "Pollination gives the guarantee of the promotion of post pollution events leads to fertilization".
  • Question 7
    1 / -0
    Cross between unrelated organisms is?
    Solution

    Hybridisation is an offspring of two animals or plants of different breeds, varieties, species or genera.

    Heterosis is the increase in growth, size, fecundity, function, yield or other characters in hybrids over those of the parents
    Test cross is a genetic cross between a homozygous recessive individual and a corresponding suspected heterozygote to determine the genotype of the latter.
    Back cross is the cross (a hybrid) with one of its parents or an organism with the same genetic characteristics as one of the parents. 
    Thus, the correct answer is option A.

  • Question 8
    1 / -0
    In Clerodendron _________ flower opens first.
    Solution
    Clerodendron shows cymose inflorescence so younger flowers are present at the base of the inflorescence, while older flowers are present at the top. Such an arrangement is called basipetal succession. The peripheral flowers open first.
    So, the correct option is 'Peripheral'.
  • Question 9
    1 / -0
    Which of the following is not the characteristic feature of plants pollinated by wind.
    Solution
    Plants pollinated by wind need to have characteristic features which allow the easy dispersal of pollen into wind currents. For this purpose, pollen grains need to be light and nonsticky, the stigma needs to be exposed, feathery and nonsticky. Long ribbon-like pollen grains cannot disperse easily in wind.
    So, the correct answer is 'pollen grains are long ribbon-like
  • Question 10
    1 / -0
    Pollen kit is present in
    Solution
    B. Entamophily
    Reason: Pollen kit which is an oily and sticky layer found on the surface of the matured pollen grains in Entamophilous plants.
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