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Plant Growth and Development Test - 33

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Plant Growth and Development Test - 33
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  • Question 1
    1 / -0
    Zn is useful in auxin synthesis as it causes formation of  .............
    Solution
    Tsui is the scientist who gave the evidences in plant implicating zinc in the synthesis of auxin by way of tryptophan. Zinc-deficient plants, which were also low in auxin, showed a decrease in tryptophan content.
  • Question 2
    1 / -0
    Which two of the following are growth promoting hormones in plant?
    Solution
    Auxin and cytokinin are plant growth promoters. They are involved in various growth promoting activities, like cell division, cell enlargement. flowering, fruiting and seed formation. 
  • Question 3
    1 / -0
    Choose the wrongly matched pair from the following.
    Solution

    Solution

    Correct answer is option D.

    Explanation for correct option:

    • Florigen, a proteinaceous hormone, functions as a universal long-range promoter of flowering.
    • Abscisic acid is an inhibiting hormone. It inhibits flowering in plants.
    • Under stress, abscisic acid accumulates in plants, inhibiting stem elongation and inducing bud dormancy.


  • Question 4
    1 / -0
    One of the commonly used plant growth hormone in tea plantation is ...................
    Solution
    Indole - 3 acetic acid and indole butyric acid are the synthetic plant hormones which are important in tea plantation. Indole-3-acetic acid and indole butyric acid are two different forms of synthetic auxin, which promotes the rooting, when mixed with a proportion of 1.0mg per litre in MS media. These synthetic hormones had also found to have multiple effects like the development of adventitious roots in tea plants.
  • Question 5
    1 / -0
    Vernalization is a phenomenon which concerns 
    Solution
    Vernalization is the acquisition of a plant's ability to flower in the spring by exposure to the prolonged cold of winter, or by an artificial equivalent. Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and summer, rather than in autumn.
  • Question 6
    1 / -0
    The major natural auxins is .........
    Solution
    Auxins are plant hormones produced at the stem tip that promotes cell elongation. The most important auxin produced by plants is indole-3-acetic acid (IAA). 
  • Question 7
    1 / -0
    If a mature differentiated cell develops into an embryo, the phenomenon
    is ..........................
    Solution
    The living differentiated cells that by now have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation. Example: formation of meristems - interfascicular cambium and cork cambium from fully differentiated parenchyma cells.
  • Question 8
    1 / -0
    Root development is promoted by
    Solution
    Correct Option: B
    Explanation for correct option: 

    Auxins promote root initiation. Auxin induces both, growth of pre-existing roots and adventitious root formation i.e., branching of the roots. As more native auxin is transported down the stem to the roots, the overall development of the roots is stimulated.

    Explanation for incorrect option: 
    • Ethylene is regarded as a multifunctional phytohormone that regulates both growth, and senescence.
    • Gibberellins are plant growth regulators that facilitate cell elongation, help the plants to grow taller.
    • Abscisic acid stimulates the growth and development of the root system including adventitious roots of the hypocotyl, the formation and growth of the lateral shoots.

  • Question 9
    1 / -0
    Which one of the following pairs is not correctly matched?
    Solution
    Correct Answer: C
    Explanation:
    • Kinetin is the cytokinin-like synthetic compound, named by Skoog and Miller, which is an adenine derivative, used to stimulate cell division in plants.
    • Abscisic acid(ABA) is a carotenoid derivative plant hormone, acts as an inhibitor in the growth of the plant.
    • IAA or Indole acetic acid is a tryptophan derivative plant hormone promoting cell growth.
    • IBA( Indole butyric acid) is as the name specifies, is an indole compound having auxin-like activity, used to produce seedless fruits.
    • Ethylene is a gaseous plant hormone, that promotes ripening in some fruits like tomato, apple, banana.
    • Hence, the incorrect answer is Terpenes -IAA.

  • Question 10
    1 / -0
    Which of the following is not properly matched?
    Solution
    Plant cells are totipotent means, each cell retains total potential to generate a new plant. Callus is an undifferentiated mass of cell generated in plant tissue culture from meristematic cells from which entire plant can be regenerated. The small piece of meristematic tissue which is used in tissue culture to generate callus is called an explant. The ratio between auxin and cytokinin is an important factor deciding initiation of roots and shoots. Phytohormone cytokinin promotes growth of shoot whereas auxin promotes growth of roots. Anther culture is done for production of haploids because anthers contain haploid microspores which can be used to generate new plants. Somatic embryos are produced by direct fusion of somatic cells one with nucleus and another without nucleus.
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