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Plant Growth and Development Test - 52

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Plant Growth and Development Test - 52
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  • Question 1
    1 / -0
    Which of the following hormones are responsible for shedding of leaves?
    Solution
    Auxin and ethylene are two plant hormones that play a major role in leaf abscission. High level of auxin triggers the production of an excess of ethylene which leads to leaf abscission.
    So, the correct answer is option D.
  • Question 2
    1 / -0
    ............ promotes bolting.
    Solution
    Gibberellins are the hormone which promotes bolting in the plants. The production of the hormone causes elongation of the internode before flowering, which results in the rosette formation in beet, cabbage, etc. This effect of hormone is commonly seen in the leafy vegetables. 
    Thus, the correct answer is option C. 
  • Question 3
    1 / -0
    Which of the plant growth regulator was first isolated from human urine?
    Solution
    The auxins are the phytohormone which was first isolated from the human urine. The hormone promotes the growth of the plant especially in the region of the tips. The application of the hormone promotes the growth of shoot in the callus culture.
    Thus, the correct answer is option A. 
  • Question 4
    1 / -0
    In a tissue culture media, the resource of the phytohormone is
    Solution
    Phytohormones are plant hormones such as auxin, cytokinin, gibberellins, ethylene and abscisic acid that accelerate the metabolic activities of the plant such as cell differentiation, cell elongation, etc. Hence these are also called as growth regulators. Coconut milk is known as a supplier of these growth regulators and so it is used in tissue culture media. Tissue culture is in vitro cultivation of plants, seeds and other plants parts for a variety of purposes. Thus the correct answer is option D.
  • Question 5
    1 / -0
    Which of the following growth regulator is considered as modified form of purine?
    Solution
    Cytokinins are the example of the plant growth hormone which initiates cell division in plants. The hormone is derived from adenine which is a purine component of the nucleic acids. Cytokinin named as kinetin was discovered and studied from the herring sperm DNA.It is a modified form of adenosine.
    Thus, the correct answer is option B. 
  • Question 6
    1 / -0
    Which of the following growth hormone is used to speed up the process of malting in brewing industry?
    Solution
    Gibberellins causes the breaking down of the starch and sugars in the seed which help in seed germination. During the process of malting in the brewing industry, it is necessary that the seeds are acted upon by the enzymes. The application of the gibberellins speeds up the process of malting due to the mobilisation of the enzymes. 
    Thus, the correct answer is option B. 
  • Question 7
    1 / -0
    The bakane disease of the rice seedling was caused by a pathogen known as 
    Solution
    Gibberella fujikuroi is the fungal species which causes the bakane disease in the rice seedling. The pathogenic infection releases of the hormone gibberellin in the form of gibberellic acid which increases the height of the plant by abnormal elongation of the internodes.
    Thus, the correct answer is option A. 
  • Question 8
    1 / -0
    Which of the following growth hormone was isolated by cleoptiles of oat?
    Solution
    The plant growth hormone auxin is synthesized maximum at the growing tips of the plant. The coleoptile tips are the shoot tips of the oat plant which were cut and used for the isolation of the auxin. The hormone causes apical dominance which allows the growth of the shoot tip suppressing the lateral buds. 
    Thus, the correct answer is 'Auxin'
  • Question 9
    1 / -0
    Which of the following is not naturally occurring plant hormone.
    Solution
    • Naturally occurring plant hormones can be grouped into five classes of compounds: auxins, gibberellins, cytokinins, abscisic acid, and ethylene.
    • GA$$_2$$ is a type of gibberellins while IAA (Indole acetic acid) is the type of auxin.
    • 2,4-D is a widely used herbicide that controls broadleaf weeds.

    So, the correct answer is option A.
  • Question 10
    1 / -0
    A plant hormone used for inducing morphogenesis in plant tissue culture is
    Solution
    Cytokinin is basically used to promote cell division in roots and shoots. They help in cell growth and differentiation at the tip of root and shoot. The callus is an undifferentiated mass of cell which is produced at the initial stage of tissue culture which is inoculated by phytohormones like auxin and cytokinin the cells of callus differentiates into root and shoot.
    So, the correct answer is option C.
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