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Plant Growth and Development Test - 58

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Plant Growth and Development Test - 58
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Hormone primarily connected with cell division is
    Solution
    Cytokinin is a plant hormone that is primarily connected with cell division. It helps in cytokinesis. Zeatin is naturally occuring cytokinin which induces cell division. It also delays senescence and breaks dormancy.
    So, the correct answer is 'Cytokinin/Zeatin'
  • Question 2
    1 / -0
    The hormone capable of replacing the requirement of long photoperiods for flowering is
    Solution
    Gibberellin is a plant hormone which helps in growth of stem. The rapid induction of flowering is called bolting. It requires either long photoperiods or cold treatment. However, it can be induced artificially by the application of gibberellin under normal conditions. Hence, it replaces the long photoperiods required for flowering. 
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    Abscisic acid controls
    Solution
    Correct Option: B
    Explanation:
    • Abscisic acid is responsible for overall plant growth and development.
    • Its main functions include regulation of dormancy and abscission (detachment of leaves or other parts of the plant).
    • It also induces dormancy in the plant so that seeds can remain unaffected by factors that are unfavorable for plant growth.
    • Cell division, shoot elongation, cell wall formation, and elongation are all promoted by a plant growth regulator called Auxin.
    Hence, abscisic acid controls leaf fall and dormancy.
  • Question 4
    1 / -0
    Vernalisation is
    Solution
    Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Other terms like jarovization, springification were also coined for the same phenomenon. However, today the most accepted term is vernalization.
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    Gibberellins bring about
    Solution
    Gibberellin is a plant hormone which helps in growth of stem. It also brings about the rapid flowering in plants. It replaces the long day required for bolting in plants. It also helps in elongation of the internodes in such a way that dwarf plants overcome the genetic dwarfism.
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    Auxin suppresses growth of
    Solution
    Apical dominance is a phenomenon in which central stem is dominant and lateral axillary buds are suppressed. It is due to plant hormone auxin produced in the tip of the shoot. Auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance. 
    So, the correct answer is 'Lateral axillary buds'
  • Question 7
    1 / -0
    Genetic dwarfness can be overcome by treating the plant with
    Solution
    Gibberellic acid is a plant hormone which helps in growth of stem. It also brings about the rapid flowering in plants. It replaces the long day required for bolting in plants. It also helps in elongation of the internodes in such a way that dwarf plants overcome the genetic dwarfism. Hence, to overcome the genetic dwarfness, the plant is treated with gibberellic acid. 
    Thus, the correct answer is option B.
  • Question 8
    1 / -0
    Gibberellic acid induces flowering in
    Solution
    Gibberellic acid is a plant hormone which helps in growth of stem. The rapid flowering with cell division and cell elongation is called as bolting. Bolting requires either long days or cold treatment. Flowering can be induced by application of gibberellic acid under normal conditions. It induces flowering in long day plants under short day conditions.
    Thus, the correct answer is option C.
  • Question 9
    1 / -0
    Highest auxin concentration occurs
    Solution
    Auxin is a plant hormone. The highest concentration of it occurs in growing tip. Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It  promotes stem elongation and inhibits growth of lateral buds. Hence, low concentration of auxin inhibits growth in stem.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    Cut pr excised leaves remain green for long if induced to root or dipped 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 and keeps leaves green for long time. So when cut or excised leaves are induced to root, it will remain green because root synthesizes cytokinin hormone.
    Thus, the correct answer is option B.
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