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Plant Growth and Development Test - 59

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Plant Growth and Development Test - 59
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  • Question 1
    1 / -0
    What is a stress hormone? or The hormone produced during adverse environmental conditions 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 causes stomatal closure during water stress. It also promotes seed dormancy under adverse condition.
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Which one is the test for gibberellin?
    Solution
    The rosette habit of cabbage can be changed drastically by the application of gibberellin. Gibberellin is a plant 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. However, bolting in cabbage can be seen in presence of gibberellin under normal conditions. 
    So, the correct answer is 'Bolting in Cabbage'
  • Question 3
    1 / -0
    The regulator which retards ageing senescence of plant parts is
    Solution
    Cytokinins is a plant hormone. It retards ageing senescence of plant parts and thus keep them productive for longer duration. This is called as Richmond Lang effect. It delays destruction of chlorophyll. It has an effect on protein synthesis and mobilizing nutrients. 
    Thus, the correct answer is option A.
  • Question 4
    1 / -0
    Gibberellin application to a plant brings about 
    Solution
    Gibberellin is a plant hormone which helps in longitudinal growth of the stem. The rapid shoot elongation of rosette plant is called bolting. Bolting needs either long days or cold treatment. Gibberellin application to a plant brings about elongation of shoot system under normal conditions.  
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    Which one induces flowering in short-day plants?
    Solution
    Gibberellin is a plant hormone. It acts as plant growth promoter. It induces flowering in short-day plants. Flowering in plants generally requires either long days or cold condition. However, it can artificially induced by application of gibberellin hormone.
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    Stomatal closure under stress conditions is due to
    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. Stomatal closure under stress condition is due to this hormone. It also promotes seed dormancy under adverse condition.
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    Foolish seedling disease/bakane of Rice helped in discovery of hormone
    Solution
    Bakanae disease is also called as foolish seedling disease. It affects the rice plant through the roots or crowns. It is caused by the fungus Gibberella fujikuroi. Affected seedlings show abnormal elongation and in severe cases may lead to death. This disease helped in discovery of hormone gibberellin produced by fungus Gibberella fujikuroi.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    Auxin synthesis occurs in
    Solution
    Auxin is a plant hormone. Its synthesis occurs in young meristematic tissues like root and shoot tips. It is synthesized from tryptophan amino acid. It acts as plant growth promoter. It is involved in various physiological processes of plants. It stimulates apical dominance and suppresses the growth of lateral buds. It also plays important role in phototropism.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    Flowering dependent on cold treatment is
    Solution
    Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing cold treatment to young plants or moistened seeds.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    One of the following is a growth retardent
    Solution
    Plant growth retardant are inhibitor of plant growth. It acts by blocking the gibberellic acid pathway which stimulates cell elongation in plants. Morphactin is a plant growth regulator. Ascorbic acid act as growth retardant. It inhibits growth processes in plants.
    Thus, the correct answer is option D. 
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