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Plant Growth and Development Test - 61

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Plant Growth and Development Test - 61
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  • Question 1
    1 / -0
    Fruit drop is prevented by spraying
    Solution
    Fruit drop is prevented by spraying auxin. When auxin is applied to fruits, the fruit drop is greatly suppressed. Also, it is observed that the intact fruit does not fall off because it synthesizes auxin.
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    The fungus associated with discovery and source of gibberellins is
    Solution
    Gibberellin was first discovered in 1935 by Teijiro Yabuta and Sumuki. It was isolated from fungus Gibberella fujikuroi  or Fusarium monoliformae and hence isolate was given gibberellin name. The fungus is also called as Fusarium fujikuroi or  Fusarium monoliformae  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 C
  • Question 3
    1 / -0
    Sometimes Potato sprouts during storage due to formation of
    Solution
    Gibberellin is a plant hormone that helps in overcoming dormancy. It causes rapid germination of seed. During storage of potato, the formation of gibberellin results in sprouting of potato. Maleic hydrazide is an inhibitor of sprouting. During foliar treatment of potato, sprouting is prevented during storage by applying maleic hydrazide. 
    Thus, the correct answer is option B.
  • Question 4
    1 / -0
    Hormone responsible for plant and seed dormancy during drought is
    Solution
    Stress hormone is a hormone produced during adverse environmental conditions. Abscisic acid (ABA) is called as stress hormone. Due to this hormone, plants respond to stresses conditions like cold, drought. It increases the tolerance of plants toward various stresses. It is found in high concentration in roots during drought and later translocated to leaves. It causes stomatal closure during water stress. It also promotes seed dormancy under adverse condition.
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    Cytokinin synthesis is maximum 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. It is mostly produced in the root apex. Roots synthesize maximum amount of cytokinin hormone.
    Thus, the correct answer is 'Roots'.
  • Question 6
    1 / -0
    Hormone discovered through tissue culture technique is
    Solution
    Hormone discovered through tissue culture technique is cytokinin. Cytokinin was discovered by Skoog and Miller. The first cytokinin discovered was kinetin. This was isolated as a DNA degradation product. 
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    Growth hormones connected with bolting are
    Solution
    Gibberellin is a plant growth hormone which helps in longitudinal growth of stem. The rapid stem elongation of rosette plant is called bolting. Bolting needs either long days or cold treatment. The rosette habit of cabbage can be changed drastically by the application of gibberellin. Bolting can be induced artificially by the application of gibberellin under normal conditions.
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Which combination is used in fruit ripening?
    Solution
    Ethylene is a gaseous plant hormone. It is also called as ripening hormone. It is used externally to accelerate the fruit ripening process. Also during ripening process, controlled amount of carbon dioxide and oxygen is needed. For artificially ripening fruit, 80% C$$_2$$H$$_4$$ and 20% CO$$_2$$ is used.
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Plant hormone causing abscission of leaves, senescence, bud dormancy and inhibition of cell division is
    Solution
    Abscisic acid is a plant hormone. It is also called as stress hormone. During stress condition like drought, abscisic acid concentration increases in plants. It inhibits cell division and induces bud dormancy. It also helps in abscission of leaves and hence the name given. It also stimulates senescence in plant.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Growth hormone obtained from a fungus is
    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 B.
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