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Plant Growth and Development Test - 12

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Plant Growth and Development Test - 12
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  • Question 1
    1 / -0
    Which one of the following is gaseous growth regulator?
    Solution
    Ethylene is a gaseous plant hormone that act as growth regulator. It inhibits plant growth. It is also called as ripening hormone. It is responsible for ripening of fruits. Fruit ripening is accompanied by increased rate of respiration. Ethylene in gaseous form is used to accelerate the process of ripening of fruits.
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Plants deficient in zinc, show reduced biosynthesis of growth hormone
    Solution
    Zinc is a necessary element required for the synthesis of IAA ( Indole-3- acetic acid), a type of auxin. So, deficiency of Zn will reduce its production.
    So, the correct answer is 'Auxin'
  • Question 3
    1 / -0
    Apical dominance is due to 
    Solution
    Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormones produced in the tip of the shoot. Auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance. Hence, apical dominance depends on the auxin to cytokinin balance. 
    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    Low concentration of auxin inhibits growth in
    Solution
    Auxin is a plant hormone. It is produced at the tip of stem. 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 5
    1 / -0
    IAA precursor is
    Solution
    Indole-3-acetic acid (IAA) is the naturally occurring auxin, plant hormone. Plant produces IAA using tryptophan as a precursor. It plays important role in development and growth of plant.
    So, the correct answer is 'Tryptophan' 
  • Question 6
    1 / -0
    Genetically dwarf plants can be induced to grown tall by using
    Solution
    Gibberellin is a plant hormone which is responsible for stem elongation by promoting cell division and elongation. They are responsible for increased internodal length in a plant. 
    Auxins cause cell elongation and cell differentiation while cytokinins promote only cell division. 
    Phycobilins are pigments found in cyanobacteria which capture the light energy for photosynthesis in them. 
    Thus, the correct answer is option C. 
  • Question 7
    1 / -0
    Photoperiodism is associated with
    Solution
    Photoperiodism is the phenomenon in which various physiological reactions like flowering response to the relative length of dark or light periods. Gibberellin is a plant hormone which brings about the rapid flowering in plants. It replaces the long day required for bolting in plants. 
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    High concentration of auxin is present in
    Solution
    Auxin is a plant hormone. It is produced in high concentration at the shoot apex. 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 shoot.
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Gibberellins promote
    Solution
    Gibberellin is a plant hormone which is involved in various physiological processes of plants.  It is a plant growth regulator. It is promotes stem elongation, seed germination, leaf and fruit senescence, etc. It breaks the seed dormancy that require cold or light to germinate.
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    Which response of growth hormone is true for ethylene?
    Solution
    Ethylene is a gaseous plant hormone. It is also called as ripening hormone as it increases ripening of fruits. Fruit ripening is accompanied by increase rate of respiration. Due to increased respiration, complex carbohydrates are broken down into simpler sugars and cell wall becomes soft. It inhibits cell division. It is also involved in abscission of leaves, fruits and flowers.
    Thus, the correct answer is option C.
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