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Plant Growth and Development Test - 56

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Plant Growth and Development Test - 56
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  • Question 1
    1 / -0
    Cell mitosis is induced by
    Solution
    Kinetin is a type of cytokinin which is a plant hormone. It promotes cell division. It induces the cell mitosis by maintaining the protein like cyclins and CDKS that are important for mitosis. 
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    If auxin concentration is increased in plant roots, the water absorption will
    Solution
    Auxin is a plant hormone that plays important role in plant growth. It stimulates stem elongation by increasing permeability of cells which in turn increases uptake of water by cells. It also increases the respiration rate. When auxin concentration is increased in roots, it will increase permeability of root cells and hence water absorption will increase.
    Thus, the correct answer is option A.
  • Question 3
    1 / -0
    Kinetin like properties are present in
    Solution
    Kinetin is a type of cytokinin which is a plant hormone. It promotes cell division. The first known cytokinin hormone was found in coconut milk. Coconut milk is liquid endosperm. It promotes cell division same as kinetin. It stimulates the embryo to grow when it is supplied with food.
    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    Leaf abscission is prevented by
    Solution
    Leaf abscission is a detachment or fall of older leaves.It occurs at the base of the petiole. When auxin is applied to the base of petiole of young leaf, the abscission is greatly suppressed. Also, it is observed that the intact leaf does not fall off because it synthesizes auxin.
    Thus, the correct answer is option D.
  • Question 5
    1 / -0
    Leaf fall occurs when
    Solution
    Leaf abscission is a detachment or fall of older leaves.It occurs at the base of the petiole. It is observed that the intact leaf does not fall off because base of petiole of young leaf synthesizes auxin. During leaf abscission, auxin content is low in the lamina as compared to stem. Also, ethylene content is high in the lamina during abscission.
    Thus, the correct answer is option B.
  • Question 6
    1 / -0
    Auxin does not increase
    Solution
    Auxin is a plant hormone that plays important role in plant growth. It stimulates stem elongation by increasing permeability of cells which in turn increases uptake of water by cells. It also enhances plasticity of cell walls which results in cell enlargement. It also increases the respiration rate.
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    Weed killers have properties similar to
    Solution
    Weed killers have properties similar to some hormones. A 2,4-D is a synthetic auxin hormone. It is an herbicide which kills unwanted weed plants. It protects monocots by selectively killing dicots like weed killers.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    Gibberellic acid has been successfully employed to induce flowering
    Solution
    Gibberellic acid is a plant hormone which helps in growth of stem. The rapid induction of flowering is called bolting. It requires either long days or cold treatment. However, it can be induced artificially by the application of gibberellic acid under normal conditions. Hence, it replaces the long day required for flowering. 
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Fruit drop occurs when fruit has
    Solution
    Auxin is a plant hormone which prevents the abscission of leaves and fruits. Young leaves and fruits produce auxin and thus remain attached to the stem. When the level of auxin declines in fruits as comparted to stem, fruit drop occurs. Hence, auxin is sprayed externally to prevent loss of fruit from premature dropping.
    Thus, the correct answer is option B.
  • Question 10
    1 / -0
    Phototropic and geotropic movements are linked to
    Solution
    Auxin is a plant hormone which plays important role in plant growth movement like phototropism and geotropism. In phototropism, plant stem bends towards the light as it has the least amount of auxin. The shaded side contains high amount of auxin and helps in elongation. In geotropism, auxin triggers downward growth of roots. High concentration of it inhibits cell elongation in roots.
    Thus, the correct answer is option C.
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