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Sexual Reproduction in Flowering Plants Test - 73

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Sexual Reproduction in Flowering Plants Test - 73
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  • Question 1
    1 / -0
    Embryo development from nucellus and integument is known as
    Solution
    The development of an embryo directly from any diploid sporophytic cell (e.g., cell of nucellus, integument etc.,) is called adventive embryony.
  • Question 2
    1 / -0
    Generally, the pollen grains of monocots are .........., and of dicots are .......... respectively.
    Solution
    Germ pore is the regions in exine that lack sporopollenin. Number of germpore is one in monocot and three in dicots. So, monocots pollens are called as uniporate while dicot pollens are called as triporate. Correct answer is C.
  • Question 3
    1 / -0
    Removal of anthers at the time of plant breeding is called
    Solution
    Emasculation is the process of removal of the anthers in order to prevent the self-pollination. It also prevents the breeding.
    Pollination is the transfer of pollen grains from the anther to the stigma of the flower.
    Fertilization is the fusion of gametes which leads to the formation of zygote.
    So, the correct answer is option A.

  • Question 4
    1 / -0
    Gymnosperms / Cycas have a mode of pollination known as
    Solution
    Most angiosperms are adapted to biotic pollination, in which pollen is delivered to stigmas by various animals. The majority of gymnosperms are pollinated by means of wind (i.e., anemophily).
    So the correct option is 'Anemophily'.
  • Question 5
    1 / -0
    An insect helping in pollination is
    Solution
    Most of the major crops heavily depend on the pollination through the giant honey bee, Apis dorsata. Some of the crops are cotton, mango, coconut, coffee, pepper, star fruit, and macadamia.
    So the correct option is Apis dorsata.
  • Question 6
    1 / -0
    In exalbuminous seeds, there is :
    Solution
    Seed store reserve food for the use of embryo at the time of germination in their cotyledons or in endosperm.
    The seeds, which store food materials in their cotyledons are called non- endospermic or exalbuminous seeds( e.g., Gram, Pea).
    The seeds, which store food materials in endosperm are called  endospermic or albuminous seeds( e.g., Castor, Maize).
    So, the correct answer is 'Consumption of endosperm during development of embryo'.
  • Question 7
    1 / -0
    In exalbuminous seed, the food is generally stored in
    Solution
    1. Seed store reserve food for the use of embryo at the time of germination in their cotyledons or in endosperm.
    2. The seeds, which store food materials in their cotyledons are called non- endospermic or exalbuminous seeds( e.g., Gram, Pea).
    3. The seeds, which store food materials in endosperm are called  endospermic or albuminous seeds( e.g., Castor, Maize).
    4. Testa- The outer coat of seed is called testa.
    So, the correct answer is 'Cotyledons'.
  • Question 8
    1 / -0
    A dicot albuminous seed is
    Solution
    The seed which store food materials in endosperm are called albuminous seed.
    A. Pea- exalbuminous seed.
    B. Castor-  albuminous seed
    C. Bean- exalbuminous seed.
    D. Gram- exalbuminous seed
    So, the correct answer is 'Castor'.
  • Question 9
    1 / -0
    Part of the embryo which comes out first during seed germination is
    Solution

    Under favourable conditions, the  seed absorbs water from the surroundings and swells up, the seed coat ruptures and the embryo emerges out. The radical grows downwards into the soil and forms root. So, the correct answer is ‘Radicle’.

  • Question 10
    1 / -0
    Aleurone layer takes part in
    Solution

    • In monocotyledonous endospermic seed, the endosperm is surrounded by a special one-cell thick layer, called the aleurone layer. Its main function is to nourish the embryo enclosed in the seed. 
    • It is protein-rich coat formed by the outermost layer of endospermic cells. It actively secretes a few enzymes which help in the process of seed germination.


    So, the correct answer is 'Enzyme Synthesis'.

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