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Plant Growth and Development Test - 55

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Plant Growth and Development Test - 55
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  • Question 1
    1 / -0
    Rapid growth of flowering axis in many plants is caused by
    Solution
    Gibberellin is a plant hormone which helps in growth of stem. The rapid growth and flowering with cell division and cell elongation is called as bolting. Bolting requires either long days or cold treatment. Bolting can be induced by higher level of gibberellin under normal conditions. It replaces the long day required for bolting. 
    Thus, the correct answer is option C ' Higher level of gibberellins'
  • Question 2
    1 / -0
    Internodal elongation is promoted by the action of
    Solution
    Gibberellic acid is a plant hormone which is involved in various developmental processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc. It helps in process of bolting. Bolting is a rapid stem elongation of plant. It also promotes elongation of the internodes in such a way that dwarf plants overcome the genetic dwarfism.
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    Cytokinins are generally
    Solution
    The first cytokinin discovered was an aminopurine derivative named kinetin. Except zeatin which is adenine derivative, all other present cytokinins are aminopurines. All the naturally occurring cytokinins are substituted purines, in which sixth carbon is substituted by amino group.
    Thus, the correct answer is option B.
  • Question 4
    1 / -0
    Hormone involved in breaking dormancy of winter buds is
    Solution
    Gibberellin is a plant hormone that is involved in various developmental processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc. The induction of dormancy in buds starts only after the falling of leaves. Winter buds can be induced to break the dormancy by exogenous application of gibberellin hormone.
    Thus, the correct answer is option B 'Gibberllins'
  • Question 5
    1 / -0
    Gibberellins take part in
    Solution
    Gibberellin is a plant hormone which helps in growth of stem. The rapid stem elongation of rosette plant is called bolting. Bolting requires either long days or cold treatment. Bolting of rosette plant can be induced artificially by the application of gibberellic acid under normal conditions. Hence, it replaces the long day required for bolting. 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 D.
  • Question 6
    1 / -0
    Name the scientist who discovered that decapitated coleoptile would resume photosensitivity and growth if severed tip is reattached through a gelatin disc
    Solution
    A tropism is a growth movement by plant part in the direction of the stimulus. According to Boysen Jensen, the stimulus for phototropism, growth in response to light, is a chemical that is present at the tip of the coleoptile. He cut the tip of the coleoptile and the severed tip was reattached through a gelatin disc. The recapitated coleoptile resumed normal photosensitivity and growth.
    So, the correct answer is C 'Boyson Jensen'
  • Question 7
    1 / -0
    Scientist who first isolated cytokinin was
    Solution
    Cytokinin is a plant hormone that as act growth regulator. It was first isolated by C. Miller as a factor that promotes cell division (cytokinesis). The first cytokinin discovered was kinetin, an aminopurine derivative. It helps in cell growth and differentiation. It also inhibits apical dominance and promotes axillary bud growth.
  • Question 8
    1 / -0
    The growth hormone, Gibberellin, was discovered by
    Solution
    Gibberellin was first discovered in 1935 by Teijiro Yabuta and Sumuki. It was isolated from fungus Gibberella fujikuroi and hence isolate was given gibberellin name. It is a plant growth regulator. It is involved in various processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc. 
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    Delay in senescence is caused by the spray of 
    Solution
    Senescence means aging. Cytokinin is a plant hormone. It plays major role in cell proliferation and cell division. During senescence, cytokinin levels are low. It delays in senescence of leaves when sprayed externally by delaying the destruction of chlorophyll and proteins in leaves. 
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    Flowering in some short day plants is promoted by
    Solution
    Gibberellin is a plant hormone which helps in growth of stem. The rapid growth and flowering with cell division and cell elongation is called as bolting. Bolting requires either long days or cold treatment. Bolting can be induced by higher level of gibberellin under normal conditions. Hence, it induces flowering in some short day plants.
    Thus, the correct answer is option B.
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