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Plant Growth and Development Test - 24

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Plant Growth and Development Test - 24
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  • Question 1
    1 / -0
    The term zeatin was given by
    Solution
    Letham coined zeatin. It is a plant hormone derived from the purine base called adenine. It belongs to the family of plant growth hormones called cytokinins and was discovered in immature corn kernels from the genus, Zea.
    So, the correct answer is option C.
  • Question 2
    1 / -0
    The phytohormone which induces triple response is ...............
    Solution
    Triple response is the peculiar characteristic of ethylene. Germinating seedlings synthesize ethylene when their growth is impeded by the soil. The ethylene promotes the so - called 'triple response' : an exaggeration of the transient developmental structure known as the apical hook, together with the inhibition of hypocotyl and root extension growth. The triple response is thought to protect the shoot and root apical meristems from damage during growth throughout the soil.
  • Question 3
    1 / -0
    Cytokinin was first synthesized by ...................
    Solution
    Cytokinins are a class of plant growth substances that promote cell division or cytokinesis in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth and leaf senescence. Letham first synthesized it from corn milk.
  • Question 4
    1 / -0
    Cytokinesis refers to ................
    Solution
    Cytokinin is a plant hormone which is vital for the mitotic divisions taking place in plants. It thus enables cytokinesis and karyokinesis in the cells. This makes cytokinin an important constituent in callus culture.
  • Question 5
    1 / -0
    Phototropism is due to the hormone 
    Solution
    Phototropism is the ability of any organism to show movement in the direction of light. It is most often observed in plants but can also occur in other organisms such as fungi. Phototropism is promoted by a phytohormone, auxin. It is a natural hormone which is produced in the plants. The accumulation of the hormone in the opposite direction allows the bending of the shoot in the direction of the sunlight.
    Thus, the correct answer is option A. 
  • Question 6
    1 / -0
    A hypothetical chemical involved in the flowering of plants is
    or 
    Chemical agent which has important role in flowering is
    Solution
    Florigen is the hypothesized hormone-like nolecules responsible for controlling and triggering flowering in plants. Florigen is produced in the leaves and acts in the shoot apical meristem of buds and growing tips. It is known to be graft-transmissible and even functions between species. It is actually gibberellin in nature.
  • Question 7
    1 / -0
    Which of the following hormone is produced during leaf fall?
    Solution
    ABA hormone is formed during leaf fall. It is a growth inhibiting hormone in plants which accelerates aging and inhibits germination and flowering. It also causes the closing of stomatal pore.
  • Question 8
    1 / -0
    Which of the following is called as phyto gerontological hormone?
    Solution
    Phytogerontology is the study of social, psychological and biological aspects of plant aging. It is learned that ethylene not only accelerates aging but also plays a dual role in the abscission of several plants. Thus, it is having a phytogerontological effect.
  • Question 9
    1 / -0
    The most efficient precursor of ethylene is 
    Solution
    Two pathways for biosynthesis of ethylene in higher plants have been postulated. One is associated with the breakdown of peroxidized linolenic acid and the other involves degradation of methionine. 
    A chemical mechanism accounting for such enzymatic formation of ethylene has been described. On the basis of this information, scientist has proposed the following scheme for the biosynthesis of ethylene in plants:
    methionine -> alpha-keto-gamma-methylthiobutyric acid -+ methional--> ethylene.
    In order to test the proposed pathways, radioactive linolenic acid and the appropriate radioactive methionine analogs were fed to apple tissue. None of these suggested precursors of ethylene was converted to ethylene as effectively as was methionine.
  • Question 10
    1 / -0
    Abscisic acid (ABA) is a stress related hormone and it also .............
    Solution
    ABA is a stress hormone which is also called as growth inhibitor hormone. It mediates stomatal closure. This helps in preventing the loss of water from plant body by the process of transpiration.
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