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Plant Growth and Development Test - 46

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Plant Growth and Development Test - 46
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  • Question 1
    1 / -0
    Ethylene is a 
    Solution
    Hormones are the biochemicals which target the cells/organs away from the site of their secretion. Enzymes are the biocatalysts which accelerate the bioreactions by lowering the activation energy of the reaction. Ethylene is a gaseous hormone which is involved in germination, growth, abscission, ripening and stress responses. Thus, option A is correct. 
  • Question 2
    1 / -0
    Which of the following test will you perform to demonstrate the presence of gibberellin? 
    Solution
    Gibberellins promote internodal growth, especially in dwarf and rosette plants like cabbage, when kept under short days. Stimulation of stem elongation in genetically dwarf and rosette plants is known as bolting. Thus, option A is correct 
  • Question 3
    1 / -0
    The growth regulator that retards ageing of plant organs is 
    Solution
    Cytokinins delay destruction of chlorophyll and proteins and thereby delaying the leaf senescence/ageing. Thus, option C is correct .

  • Question 4
    1 / -0
    Which of the following is a weed killer ? 
    Solution
    2,4-D is the abbreviated form of 2,4-Dichlorophenoxyacetic acid. It is a chemical compound which is commonly used as a weedkiller. It is the synthetic form of auxin. The compound was used by the U.S. military to clear the trees by defoliation. These are used for clearing the areas of woody trees and some other herbaceous weeds. These hormones cause defoliation of the trees and thereby, killing the trees. 
    Thus, the correct answer is option A. 
  • Question 5
    1 / -0
    Cut leaves remain green for longer time when dipped in 
    Solution
    Cytokinins delay the destruction of chlorophyll and proteins and thereby delaying the leaf senescence. That’s the reason the cut leaves remain green when dipped in cytokinin solution
    So, the correct answer is 'Cytokinins'
  • Question 6
    1 / -0
    What is vernalization ?
    Solution
    Vernalization is acquisition of ability of plants to flower by chilling treatment. In absence of cold treatment, accumulation of ent-kaurenoic acid in shoot tip occurs. Cold treatment followed by exposure to high temperatures convert it into $$GA_9$$, which stimulates flowering response in plants. Thus, option D is correct. 
  • Question 7
    1 / -0
    Auxin inhibits the growth of  
    Solution
    Apical dominance involves withdrawal of root manufactured cytokinins towards apical bud which in turn makes the lateral and intercalary meristem cytokinins deficient. Cytokinins deficiency suppresses growth of lateral and intercalary meristem as cytokinins are the hormones of cell division. Auxins perform this function. Thus, the correct answer is C.
  • Question 8
    1 / -0
    Which one of the following is primarily concerned with cell division ? 
    Solution
    Cytokinins are the plant growth hormones that regulate the cell division in root and shoot of the plant both in vivo and in vitro. They do so by regulating the controls that govern the transition of the cell from one stage of the cell cycle to the next one. Thus, option C is correct  
  • Question 9
    1 / -0
    Which phytohormone is generally used in tissue culture for establishing roots in callus?
    Solution
    Callus is a growing mass of unorganized parenchyma cells used in plant tissue culture. It is formed due to intermediate level of auxins and cytokinins. A high ratio of cytokinin to auxin favors shoot formation and a high auxin to cytokinin ratio favors root formation in callus. Thus the correct answer is option B.
  • Question 10
    1 / -0
    The growth regulator that retards ageing of plant organs is called as
    Solution
    Cytokinins have a striking quality to retard senescence (i.e., process of ageing) in plants. External application of cytokinins delay the rate of chlorophyll disappearance and protein degradation which usually accompanies the process of senescence in leaves.
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