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Plant Growth and Development Test - 25

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Plant Growth and Development Test - 25
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Assertion : Ethylene cause climacteric ripening of fruits 

    Reason : Climacteric fruits show a rise in respiration at the time of ripening.
    Solution
    In most fruits, the rate of respiration will undergo a sharp rise and then fall near the end of ripening. Kidd and West termed this phenomenon climacteric. The climacteric acts as a trigger that sets in progress those changes that rapidly transform the fruit from an unripe to a ripe condition. Finally, application of ethylene to unripe fruit will bring on a premature climacteric and accelerate ripening. 
    So, the correct answer is B 'If both the assertion and reason are true but the reason is not a correct explanation of the assertion'
  • Question 2
    1 / -0
    Which of the following statement is false with respect to application of auxins 
  • Question 3
    1 / -0
    Phototropic and geotropic movements are linked to 
    Solution
    Phototropic and geotropic movements are related to differential hormone action. Shoot grows positively phototropic and negatively geotropic. Whereas roots grow negatively phototropic and positively geotropic. Auxin is the phytohormone which induces apical dominance and phototropic movements.
  • Question 4
    1 / -0
    Which combination of gases is suitable for fruit ripening?
    Solution
    80% ethylene and 20% CO2_{2} is the optimum composition for the ripening of fruits. Ethylene is the gas which helps in artificial ripening. Ethylene promotes flowering of plants. It also promotes senescence.
  • Question 5
    1 / -0
    Nucleoprotein is in high quantity during 
    Solution

    Nucleoproteins are any proteins that are structurally associated with nucleic acids, either DNA or RNA. Typical nucleoproteins include ribosomes, nucleosomes. Dedifferentiation refers to the reversion of cells from a highly specialized / differentiated form to less specialized / undifferentiated form or back close to embryonic stage, where the cells divide actively. Since, the main function of nucleoproteins is to participate in regulating DNA replication and transcription that is important for the process of dedifferentiation, nucleoprotein will be highly present during dedifferentiation.

  • Question 6
    1 / -0
    .................. hormone is applied to cuttings to induce root initiation in horticulture.
    Solution
    Auxin is applied to cuttings to induce root initiation in horticulture.
    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. If the source of auxin is removed, such as by trimming the tips of stems, the roots are less stimulated accordingly, and growth of stem is supported instead.
    In horticulture, auxins, especially NAA and IBA, are commonly applied to stimulate root initiation when rooting cuttings of plants. However, high concentrations of auxin inhibit root elongation and instead enhance adventitious root formation. Removal of the root tip can lead to inhibition of secondary root formation.
  • Question 7
    1 / -0
    Name the plant hormone responsible for the growth of stem.
    Solution
    • Gibberellin (GA) is one of the plant hormones that regulate a wide range of processes involved in plant growth, organ development, and environmental responses.
    • Gibberellins are produced in greater mass when the plant is exposed to cold temperatures. They stimulate cell elongation, Growth of stem, breaking and budding, seedless fruits, and seed germination, etc.
    • Hence the plant hormone responsible for the growth of stem is Gibberellin.
    • So, the correct answer is 'Gibberlin'.
  • Question 8
    1 / -0
    Name the plant hormone responsible for elongation of cells.
    Solution
    • Auxins are generally produced by the growing apices of the stem and roots, from where they migrate to the regions of their action. For example, IAA and indole butyric acid(IBA).
    • The primary function of the auxin hormones is to elongate plant cells in the stem. For Example, auxins are the hormones responsible for phototropism, the growth of a plant toward the light.
    • Hence The plant hormone responsible for elongation of cells. is Auxin.
    • So, the correct answer is 'Auxin'.
  • Question 9
    1 / -0
    Auxetic growth is one in which there is 
    Solution
    Auxetic growth or Auxesis refers to the growth of tissue from an increase in cell size( by increasing the intracellular mass and volume) rather than an increase in the number of cells. 
    Auxetic growth occurs in certain tissues of the higher animals as well as in some organisms, such as nematodes, tunicates and rotifers.
    So, the correct answer is 'Option B- Increase in cell volume only'.
  • Question 10
    1 / -0
    During seed germination its stored food is mobilized by 
    Solution
    Correct Answer: D
    Explanation:

    • Gibberellin is a type of plant hormone. In seed the stored food is starch Gibberellins stimulate the synthesis of two enzymes i.e protease and α-amylase which are involved in the formation of sugar from starch.
    • The proteases convert an inactive β-amylase to the active form. The active β-amylase and α-amylase together convert starch to glucose which is mobilized to meet the metabolic demands of the embryo during the germination of seed.
    • Hence, during seed germination, its stored food is mobilized by gibberellin

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