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Plant Growth and Development Test - 64

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Plant Growth and Development Test - 64
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  • Question 1
    1 / -0
    Which is incorrectly matched?
    Solution
    A.Correct option-B
    B.Explanation for correct option:

    • Gibberellic acid is a terpene chemically.
    • It helps in stem elongation, germination and overcomes genetic dwarfism.

    C.Explanation for the incorrect option :
    Option A: Kinetin is a type of cytokinin, a plant hormone. Cytokinin is an adenine derivative. It helps in cell division.
    Option C: Abscisic acid is a plant hormone that is a carotenoid derivative. It causes the abscission of leaves. It is also called a stress hormone.
    Option D: IBA (indoleacetic acid) is an indole compound. It is a plant hormone that acts as a growth promoter. 
  • Question 2
    1 / -0
    Growth in internodal regions of green plants is due to
    Solution
    Gibberellin is a plant hormone which helps in growth of stem. It also brings about the rapid flowering in plants. It replaces the long day required for bolting in plants. It also helps in elongation of the internodes in such a way that the genetically dwarf plant will elongate.
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    The phenomenon which shortens vegetative period and hastens flowering is
    Solution
    Etiolation is a condition in which plant is grown in the partial or complete absence of light. The leaves are tiny and yellow in color. Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. It shortens the vegetative period and hastens the flowering. Photoperiodism is the phenomenon in which various physiological reactions like flowering response to the relative length of day and night.
    Thus, the correct answer is option B.
  • Question 4
    1 / -0
    Match the columns and find the correct combination:
          I        II
    aZeatin1.Flowering hormone
    bFlorigen2.Synthetic auxin
    cIBA3.Cytokinin
    dNAA4.Natural auxin
    Solution
    Florigen is a flowering hormone. It controls the flowering in certain plants. It is involved in the process of photoperiodism. Zeatin is a type of cytokinin, a plant hormone. It is naturally found in plants. It was isolated from maize. IBA (indolebutyric acid) is a type of naturally occurring auxin. It is involved in root and shoot growth. Naphthaleneacetic acid (NAA) is a synthetic auxin. It is used for vegetative propagation.
    Thus, the correct answer is 'a- 3, b- 1, c- 4, d- 2'.
  • Question 5
    1 / -0
    Rapid and dramatic increase in shoot length is
    Solution
    Rapid and dramatic increase in shoot length is called as bolting. It is seen in flowering plants during long day condition. It requires either long days or cold treatment. It can artificially be induced by application of gibberellic acid.
    Thus, the correct answer is 'Bolting'.
  • Question 6
    1 / -0
    Natural cytokinins are synthesised in tissues that are
    Solution
    Cytokinin is a plant hormone that is involved in various physiological processes. It is growth promoting hormone. It stimulates cell division or cytokinesis and hence the name was given. It is synthesized in high concentration in tissues that are dividing such as cambium.
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    One hormone helps in ripening of fruits and other brings about stomatal closure. They are respectively
    Solution
    Ethylene and abscisic acid both are the plant hormones. Ethylene hormone is also called as ripening hormone as it helps in the ripening of fruits. Abscisic acid is also called as a stress hormone. It promotes stomatal closure when insufficient water is available in the soil. 
    Thus, the correct answer is option B.
  • Question 8
    1 / -0
    Study of phototropic lead to the discovery of
    Solution
    Phototropism is the growth of an organism in response to light stimulus. The response of plants to light was first discovered by Charles Darwin. He discovered that the plant hormone auxin was present on the tip of the stem and played a role in plants bending toward a light source.
    Thus, the correct answer is option D.
  • Question 9
    1 / -0
    Which plant hormone was discovered as kinetin?
    Solution
    Kinetin was first isolated from herring sperm DNA by Miller and Skoog. It is a type of naturally occurring cytokinin, a plant hormone. It promotes growth. It induces cell division or cytokinesis.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    6-(4-Hydroxy-3 Methyl-trans-2-butenylamine) purine is also called
    Solution
    A 6-(4-Hydroxy-3 Methyl-trans-2-butenylamine) purine is a chemical name of trans zeatin. It is a type of cytokinin, plant hormone. It was first found in Zea maize. It stimulates the cell division process in plants. It acts as plant growth regulator.
    Thus, the correct answer is option B.
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