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Plant Growth and Development Test - 62

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Plant Growth and Development Test - 62
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  • Question 1
    1 / -0
    Bud dormancy is induced by
    Solution
    Abscisic acid is a plant hormone. It is also called as stress hormone. It causes abscission of leaves. During stress environmental condition, its concentration increases and induces bud dormancy. When favorable condition returns, bud dormancy is broken.
    Thus, the correct answer is option C.
  • Question 2
    1 / -0
    Auxin causes cells to absorb water from hypertonic medium because
    Solution
    Auxin is a plant hormone that plays important role in plant growth. It stimulates stem elongation by increasing permeability of cells which in turn increases uptake of water by cells. It also increases the respiration rate. Auxin concentration increases permeability of cells and  water absorption increases due to increased rate of transpiration.
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    Size of grapes increases in application of
    Solution
    Gibberellin is a plant hormone. It is plant growth promoter. When applied artificially during early stage of development, it causes elongation of stem in grape plant. Size of grapes are also increasing drastically by application of gibberellin. 
    Thus, the correct answer is 'Gibberelin'.
  • Question 4
    1 / -0
    Which hormone is responsible for apical growth?
    Solution
    Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormone auxin produced in the tip of the shoot. IAA (indoleacetic acid), an auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance. 
    Thus, the correct answer is 'IAA'.
  • Question 5
    1 / -0
    Hormone that breaks dormancy of seeds/potato tuber is
    Solution
    Gibberellin is a plant hormone that is involved in various physiological processes. It breaks dormancy of seeds and potato tuber and induces germination of seeds. It causes elongation of stem in plants.
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    Which one prevents premature fall of fruit?
    Solution
    Auxin is a plant hormone which prevents the abscission of leaves and fruits. NAA is a type of auxin. Young leaves and fruits produce NAA and thus remain attached to the stem. When the level of auxin declines in fruits as compared to stem, fruit drop occurs. Hence, auxin is sprayed externally to prevent loss of fruit from premature fall.
    Thus, the correct answer is 'NAA'.
  • Question 7
    1 / -0
    Which of the following is a cytokinin?
    Solution
    Cytokinin is a plant hormone which is involved in various physiological processes of plants. Zeatin is the most common type of naturally occurring cytokinin. It is found in maize. It is also found in the coconut milk. It promotes cell division.
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Vernalisation promotes flowering in response to
    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. 
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Fruit ripening is promoted by
    Solution
    Ethylene is a plant hormone. It is also called as ripening hormone as it is responsible for 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. 
    Thus, the correct answer is 'Ethylene'.
  • Question 10
    1 / -0
    Shedding of leaves, flowers and fruits due to change in hormone balance in plants is
    Solution
    Senescence is the process by which cells stop dividing and growth is arrested without undergoing cell death. It is also called as ageing. Abscission is also called as fall. Shedding of leaves, flowers or fruits due to change in hormone balance in plant is called as abscission. Photoperiodism is the phenomenon in which formation of flowers in plants depends on the relative length of dark or light periods. Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged period of low temperature or cold. 
    Thus, the correct answer is option B.
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