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Plant Growth and Development Test - 54

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Plant Growth and Development Test - 54
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The synthesis of amylase in certain cereals is stimulated by
    Solution
    Gibberellic acid is a plant hormone which breaks the dormancy. Before the germination, starch nourishes seedling. It stimulates the synthesis of amylase enzyme in the aleurone cells of certain cereals. Amylase hydrolyses starch into glucose which is used to provide nourishment to the seed embryo. 
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    Identify the physiological function of two microelements. Of them, the former is required for synthesis and the latter for the oxidation of IAA respectively.

    (i) Constituent of a chlorophyll molecule
    (ii) Maintenance of cell turgidity
    (iii) Splitting of water in photosynthesis
    (iv) Cofactor for carboxypeptidase
    (v) Component of methionine
  • Question 3
    1 / -0
    A characteristic feature of some fruit ripening is sudden increase in respiration. It is known as
    Solution
    Certain fruits ripen with sudden rise in cellular respiration and ethylene production. Such fruits are called 'climacteric fruits'. Climacteric is considered final stage in fruit ripening process during which the fruit is maximum ripened with best taste for consumption. After that period, it starts to gradually deteriorate and the respiration returns to normal rate.
    Hence the correct answer is 'Climacteric'.
  • Question 4
    1 / -0
    The growth of plants differs from growth of animals in being
    Solution
    The growth of plants differs from growth of animals in certain aspects. Plants show continuous growth throughout the life. Animals show growth for definite period. Growth in plant is localized to certain regions like root apex, shoot apex etc. Growth in animal is diffused. It takes place in all the parts of the body and the active regions of growth cannot be identified.
    Thus, the correct answer is option A.
  • Question 5
    1 / -0
    Gibberellins were first extracted from
    Solution
    Gibberellin is a plant hormone that is involved in various developmental processes. It was first discovered by Eiichi Kurosawa while studying foolish seedling disease. It was first extracted from fungus Gibberella fujikuroi. It helps in stem elongation, germination, dormancy, leaf and fruit senescence, etc.
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    High C/N ratio produces
    Solution
    A carbon-to-nitrogen ratio is a ratio of carbon to the nitrogen in a plant. In general, a high C/N ratio produces a high acid content and low methane production. In plants young tissues have less C/N ratio. Plants with high C/N ratio have more mechanical tissues and larger root system.
    Thus, the correct answer is 'More mechanical tissues'.
  • Question 7
    1 / -0
    Cytokinins are mostly produced in
    Solution
    Cytokinin is a plant hormone. It promotes cell division. It also delays the destruction of chlorophyll and protein. It shows delay of senescence in leaves.  It is mostly produced in the root apex. When an excised leaf is induced to root, it does not turn yellow because root apex synthesizes cytokinin hormone.
    Thus, the correct answer is option B.
  • Question 8
    1 / -0
    An excised leaf does not turn yellow if it is induced to root. This is attributed to the synthesis in root of
    Solution
    Cytokinin is a plant hormone. It promotes cell division. It also delays the destruction of chlorophyll and protein. It shows delay of senescence in leaves. So when an excised leaf is induced to root, it does not turn yellow because root synthesizes cytokinin hormone.
  • Question 9
    1 / -0
    The rosette habit of cabbage can be changed drastically by the application of
    Solution
    Cabbage is a rosette plant. The rosette habit of cabbage can be changed drastically by the application of gibberellic acid. GA is a plant hormone which helps in longitudinal growth of stem. The rapid stem elongation of rosette plant is called bolting. Bolting needs either long days or cold treatment. However, bolting can be induced artificially by the application of gibberellic acid under normal conditions.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    During wall enlargement new wall materials are inserted amongst the older ones.The phenomenon is
    Solution
    Accretion is the phenomenon in which during growth, gradual external accumulation of new layers on the older ones takes place. During wall enlargement new wall materials are inserted amongst the older ones. The phenomenon is intussusception. 
    So, the correct answer is  C 'Intussusception'
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